The Reactor Design Project Engineering Essay

The Reactor Design Project Engineering Essay The project objective was to optimize three different adiabatic ammonia reactor configurations with respect to reactor performance in order to produce 800 tonnes of ammonia per day, or the molar equivalent of 0.5447 kmol s-1 of ammonia. The optimizations in reactor performance involved primarily, minimizing the catalyst volume and secondarily, maximizing the catalyst lifespan, as well as ensuring the final operating conditions were stable. Due to the absence of a cost function, the reactor could NOT be optimized with respect to cost minimization. Three different reactor types were considered, namely a single plug-flow reactor, a dual interstage cooling reactor and a dual cold-shot cooling reactor. Temperature, pressure and fraction of ammonia in the feed stream were found to have the greatest effect on the resultant catalyst volume. Using MATLAB, it was found that the minimum volumes were 9.61 m3, 3.94 m3 and 4.78 m3 for a single stage plug-flow, an interstage cooling configuration and a cold shot cooling reactor configuration respectively. The interstage cooling reactor allowed for a 59% decrease in total catalyst volume when modified from the single stage design, but required an increase in inlet feed temperature of 115K and 2 additional heat exchangers. The cold shot cooling method allowed for a 50.2% decrease in reactor volume from the single stage design, requiring a 75K increase in feed temperature. 1. Introduction 1.1. Background Ammonia synthesis (also known as the Haber process) is one of the most widely applied chemical processes in the world; in 2009, the total worldwide production of ammonia exceeded 133,000 metric tonnes 1, this is second only to the worldwide production of sulphuric acid. Most of the ammonia produced is used in the manufacture of fertilisers (such as ammonium nitrate), ammonia is also used in the manufacture of nitrogen-based polymers such as nylon. Another noteworthy use of ammonia is as the starting reagent for the manufacture of nitrogen-based explosives such as nitroglycerin. The reaction which generates ammonia is exothermic and equilibrium limited: N2 + H2 is in equilibrium with NH3 ΆHR (298K, 1atm) = -46.11 kJmol-1 [Eqn. 1] In the early 20th century, Fritz Haber discovered that in order to obtain a significant yield of ammonia, the reaction required both high pressures and low temperatures (in accordance with the van t Hoff-Le Chatelier principle). It was known that the rate at which N2 decomposed in the reaction was very slow (N2 is thermodynamically more stable than NH3); therefore a very efficient catalyst was required in order to facilitate ammonia formation. Nowadays, the catalyst used in most industrial ammonia reactors is usually a porous form of enriched iron. Catalysts are expensive, but they present a good trade off; reactors are able to produce sufficient amounts of product at lower, more manageable temperatures and pressures. 1.2. Design objective The overall objective was to design a continuous fixed bed plug-flow process to meet the companys daily ammonia production demand of 800 tonnes per day (exclusive of any ammonia in the feed). The primary design objective was to try to minimize the catalyst volume the process required in order to meet the production requirement. The design also had to be considered safe to operate and had to operate at conditions that were considered to maximize the lifespan of the catalyst; these two were considered as secondary objectives. The preliminary design of the reactor considered a single-stage adiabatic bed with a bed cross-sectional area of 2.0 m2. The final designs involved two different two-stage systems; one implementing interstage cooling and the other implementing cold-shot cooling. Reactor performance and sensitivity were analysed by observing the effects of altering specific operating and design variables. The cost function for the process was not known, therefore it is important to note that the reactor could not be optimized with respect to cost, however the design could be implemented such that the reactor performance was greatly improved. For example, minimizing the required catalyst volume (and hence minimizing the reactor volume) will reduce the construction cost of the reactor. However this may come at the expense of greater operating and maintenance costs and, in the case of two-stage systems, may result in additional construction costs (interstage cooling requires heat exchanger(s) to be built). The investigation will only allow qualitative suggestions to be made as to which specific design aspects contribute to the generation and/or reduction of costs. 1.3 Safety The reactor operating conditions should be stable; such that small disturbances will not lead to thermal runaway (which has important implications for safety). Other than that, there are no large risks involved with operating the ammonia reactor, provided that good process control is implemented by the operator. 2. Kinetic theory and types of reactor configurations 2.1. The kinetics of ammonia synthesis and its implications on reactor design Ammonia synthesis involves a single exothermic, reversible reaction between nitrogen and hydrogen. For reversible reactions, the conversion corresponding to thermodynamic equilibrium at the chosen operating conditions cannot be surpassed. Since the reaction is exothermic, the activation energy (which is only temperature dependent) of the backwards reaction is greater than that of the forward reaction. Therefore an increase in temperature causes a rise in the rate of the reverse reaction which is greater than the rise in the rate of the forward reaction thus decreasing the maximum attainable conversion but decreasing the required catalyst volume. On the other hand, operating at a lower temperature increases the maximum attainable conversion, whilst reducing the total reaction rate and increasing the required catalyst volume. With regard to pressure, the effect is the opposite; increasing the pressure causes a greater rise in the rate of the forward reaction compared the backward react ion and vice versa. Designing a reactor producing ammonia therefore requires a compromise between keeping temperatures sufficiently high such that reaction rate remains significant whilst obtaining a respectable conversion of ammonia. Similarly, the pressure should be great enough so as to maintain a significant reaction rate, but not so high as to cause the reactor to deviate from safe operation. In order to minimize catalyst volume (and meet the primary objective), it is desirable to operate at the maximum forward rate of reaction at each cross-section across the reactor; thus maximizing the average forward rate across the reactor, this allows the desired extent to be met with the minimum catalyst surface area and hence with the minimum catalyst volume. In order for this to occur, each cross-section in the reactor must be operated at the unique pressure and temperature required to achieve maximum rate for a particular extent, i.e. the reactor moves along the locus of maximum reaction rates. This is unfeasible in this investigation since there is no temperature or pressure control implemented across the reactor (the reactor is adiabatic and WSHAFT=0); and even so, maintaining specific pressures and temperatures at each point along the reactor is practically unfeasible in itself; as each point in the reactor would require its own heat exchanger and pressure control system. Therefore for exothermic reversible reactions (without heat removal), the temperature increases along the length of the reactor and the rate vs extent profile will always have a characteristic maximum because the temperature along the reactor increases due to the heat released by the reaction, causing the net production rate to increase up to a certain extent before the reverse reaction starts to become significant. As the rate of the backwards reaction tends to increase further and temperature rises, the overall reaction rate will eventually reach zero at equilibrium. 2.2. Brief description of the Plug-Flow Reactor (PFR) A plug-flow reactor is characterized by fluid flowing through one end of the reactor and out the other, whilst satisfying the assumptions of plug-flow. The assumptions state: Fluid properties and flow rate remain constant across any cross-section of the reactor. The flow is orderly, with no element overtaking or mixing with fluid ahead or behind, (i.e. the residence time is the same for all fluid elements). The above assumptions tend to hold true where there is turbulent flow (Re >105), ensuring good radial mixing, and if the ratio of reactor length to diameter of the reactor is large (ratio à ¢Ã¢â‚¬ °Ã‚ ¥ 50), where lateral mixing may be neglected 2. Figure 1: An illustration of a plug-flow reactor 3 2.3. Brief description of Interstage Cooling Interstage cooling, also known as intercooling, is a multiple reactor design suitable for exothermic reversible reactions. Heat exchangers are used to cool the output of each reactor before being passed on to the next reactor, allowing for a greater possible conversion to be achieved in each successive reactor. This process can be replicated for an indefinite number of reactors until the reactor temperature is too low for reactions to occur or until the decrease in catalyst volume is not worth the additional cost of construction and complexity of operation. This project considers only the case where two reactors are used. Figure 2: An illustration of a dual reactor interstage cooling system4 2.4. Brief description of Cold-shot Cooling Cold-shot cooling reactor designs are similar to that of interstage cooling, but allow for elimination of the intermediate heat exchangers by injecting cold feed directly into the outlets of each reactor. This addition cools down the outlet stream of the reactor and also has the effect of decreasing the composition and conversion of the flow into the subsequent reactor (corresponding to the path from point b to c in Figure 3 below). Figure 3: An illustration of a dual reactor cold-shot cooling system 5 The flow diagram of two cold-shot reactors illustrates the lack of heat exchangers as compared to interstage cooling, as well as the splitting of the initial feed stream by the splitting fraction alpha, ÃŽÂ ±, which is the fraction of the fresh feed used as the coolant. The extent of reaction remains constant after mixing (which can be proven by a mass balance). 3. Mathematical model Derivations of differential equations All the assumptions of plug-flow mentioned above were applied in the construction of the equations below; the reactor was also assumed to operate at steady state (there is no mass hold up due to the catalyst). All other assumptions are mentioned in the derivations. It should be noted that rNH3 is defined as (rNH3 generated rNH3 consumed) and is measured per unit of catalyst volume; hence the equations specify the volume of catalyst VC and not the reactor volume VR. 3.1. Change in catalyst volume with respect to the extent of reaction: Mass balance on ammonia: [Eqn. 2] The extent of reaction can be defined as: [Eqn. 3] Equations 2 and 3 were combined to obtain the following equation: Since , the equation above was rearranged to give the initial catalyst volume gradient: [Eqn. 4] 3.3. Change in temperature with respect to the extent of reaction: Figure 4: An illustration of the cross section of a plug-flow reactor An energy balance across an infinitesimally small cross section of the catalyst bed gave: Shaft work (W), changes in kinetic energy and changes in potential energy were neglected: The equation above was divided by the cross-sectional area of the tube, A: where Q denotes the heat transfer by conduction. In the equation below, the enthalpy change upon mixing was neglected (a perfect solution was assumed). It was also assumed that the gases in question were ideal and hence their enthalpy was independent of pressure, the energy balance then took the form: [Eqn. 5] is the standard heat of formation of compound. i denotes each species present. Recalling that for a tubular reactor, and : does not have a negative sign as rproduct is calculated as the main subject) [Eqn. 6] The heat of reaction was simplified as shown below: [Eqn. 7] Equation 7 was substituted into Equation 6 which was then substituted into Equation 5: [Eqn. 8] The chain rule was used to combine and : Since the reactor was assumed to be adiabatic, Q = 0: [Eqn. 9] 3.4. Change in pressure with respect to the extent of reaction: The chain rule was used to find using the formula for , bed cross-sectional area A and since A dl = dVC. Substituting the components of the three terms above, we get the initial pressure against extent gradient formula: [Eqn. 10] 4. Simulation theory and strategy 4.1. Main simulation objectives Regardless of the design used, these objectives are overarching and apply to all three reactor types: The first two bullet-points define what is meant by optimizing the reactor: Minimizing catalyst volume; Operating temperatures and pressures are limited by safety considerations (preventing thermal runaway), material construction and catalyst degradation conditions. These degradation conditions are specified by actual limits set by ammonia process operators in industry: these are above 823 K and above 300 bar 6; Interstage and cold-shot cooling designs are only dual reactor designs. The derivation of the required total extent for all simulations is as follows: The MATLAB coding incorporating the required data and was used to solve the differential equations described earlier in the mathematical model for the outlet temperature, pressure and catalyst volume; all the assumptions applied in the mathematical model were thus applied in the coding, unit consistency was also maintained in the programming. 4.2. Single stage simulation strategy It is clear that a plug-flow reactor can take advantage of concentration profiles present in the reactor in order to minimize the total catalyst volume. Near the desired extent, adiabatic plug-flow reactors (running exothermic reversible reactions) operate ideally somewhere between the equilibrium line, where the rate of the forward and backwards reaction are equal, and the optimum line, which is a curve connecting the maximas of all the different rate curves, also known as the locus of maximum rates. Figure 5: A graph displaying the variation of forward rate with extent It is opted to run the reactor under conditions such that the inlet rate is exactly equal to the outlet rate where the reactor exits at the desired extent of 0.5447. The rin = rout condition limits the maximum average rate by a small amount but provides a greater amount of kinetic stability in the event of a disturbance; a small increase in the inlet temperature may push the reaction closer to equilibrium whilst a small decrease in the inlet temperature will decrease the outlet rate slightly but still allow the reactor to operate in a region of higher rates. The locus of rin = rout is found between the optimum line and the equilibrium line. As shown in Figure 5, this condition also means that the region of maximum reaction rate is taken advantage of; i.e. the rate in the reactor is always greater than or equal to the inlet rate. Therefore, although the temperature increases along the reactor, the forward rate is kept as high as possible. As the extent of reaction increases across the reactor for a fixed set of inlet conditions, it is expected for the surface area of catalyst to increase; if more product is generated, more catalyst is required to facilitate this generation. There is a limit in the MATLAB coding such that the catalyst volume decreases whilst the reaction extent continues to increase; the code is such that results after this point are treated as erroneous and are not used, thus the code finds the inlet conditions needed to achieve the maximum possible extent for an adiabatic reactor. To apply the simulation strategy, a MATLAB program was created to find the inlet conditions which satisfy the rin = rout condition for a desired final extent (0.5447 in this case). A separate program was also created to vary operating and design conditions individually and examine their effect on the catalyst volume. Graphs of the locus of maximum reaction rate, locus of rin = rout rates and the equilibrium curve were constructed using the desired inlet conditions determined from the single stage simulation. 4.3. Interstage cooling simulation strategy The overall reaction follows the adiabatic operating curve (it may not necessarily be a straight line due to the pressure drop across the reactor). It was desirable for the reaction to end at the same point as in the single stage simulation (with the same final extent); where the rate at the outlet of the second reactor lies on the rin = rout line for the desired extent. It was also desirable for the rate at the exit of the first reactor to be equal to the rate at the entrance of the second reactor; so that the reactor can continue onwards from the same rate in the second reactor (and maintain the average forward reaction rate). For this code, there was no condition that the rate at the inlet of the first reactor must equal the rate at the outlet of the first reactor (and likewise for the second reactor); since it was unfeasible to make the rates equivalent at all the inlets and outlets. Instead it was specified that rate1 OUT= rate2 IN and that rate2 OUT = rate OPTIMIZED SINGLE STAGE OUT. The extent in the first reactor (and therefore in the second reactor) had to be specified for each set of results. If the extent was too high, the outlet of the first reactor would be very near equilibrium whilst if it was set too low the outlet of the first reactor would be reached before the maximum rate had been obtained; therefore a degree of overshoot past the maximum reaction rate was desirable; the program ensured that there was a degree of overshoot past the maximum reaction rate in both reactors before validating a result. The locus of maximum reaction rates (from the single stage optimization) was used to determine the feed temperature for which the rate is a maximum at the start; this temperature was roughly 790K (located graphically). Above this temperature, the region of maximum reaction rates was not utilised at all; and the maximum extent achievable (using the gradient of the operating line) at equilibrium was roughly 0.28. This specified the minimum extent of reaction in reactor 1. If the feed temperature were too low, the first reactor would perform similar to a single PFR, defeating the purpose of having two reactors. Thus a moderate extent range of 0.3 0.4 was chosen for the first reactor as it was unworkable to put an excessive production load on either reactor. In order to apply this strategy, a program was used to specify the inlet conditions to the second reactor; the program moved along the operating curve using the initial conditions obtained in the single stage reactor up to the desired extent in the first reactor. This gave the inlet rate to the second reactor as well as the flow rate, temperature and composition of this stream. Following this, the rate1 OUT = rate2 IN condition was used to acquire the inlet and outlet temperatures and pressures of the first reactor and its volume. Lastly, the inlet conditions to the second reactor and the remaining extent were used to calculate the volume of the second reactor. The combined volumes and degrees of cooling between the reactors were compared for the chosen range of extents. 4.4. Cold-shot cooling simulation strategy Figure 6: A graph displaying the variation of extent with temperature for a cold-shot system The rate identity rin=rout used to optimize the single PFR was used in the cold-shot cooling reactor design. With reference to Figure 6, optimization was achieved by ensuring that the reaction moved from points aÆ’Â  bÆ’Â  cÆ’Â  d , with the following rate identities; ra = rb and re = rd. The second reactor would operate along the path that the optimum single PFR would operate on (e Æ’Â   d). By adhering to the above conditions, there were three variables left to define, namely alpha (ÃŽÂ ±), initial feed temperature Tini and the interstage extent ÃŽÂ ¾1. Fixing alpha and Tini would automatically define ÃŽÂ ¾1 and outlet temperature of the first reactor as the rates at points a and b must be the same. This optimized the first reactor for the given inlet conditions. By constructing enthalpy and mass balances on the mixing point of the outlet from the first reactor with the cold stream, the inlet temperature into the second reactor was determined, thereby finding outlet conditions of the second reactor, should it achieve the required extent of 0.5447 kmol s-1. Finally, in order to ensure that total optimization had occurred for the specified alpha and temperature, the difference in rates at points e and d was confirmed to be as close to zero as possible. Several iterations would be required to home in on the best inlet temperature for a given extent. The temperature of the feed used for cooling, Tf, was 298K; significantly lower than the temperature of the fluid exiting the reactor. This imposed an upper limit on the split fraction ÃŽÂ ±, beyond which the feed temperature into the second reactor would be too low for reactions to operate at an acceptable rate; catalyst volume would need to be larger to counter this effect, meaning optimization would not achieved. Therefore, by varying ÃŽÂ ± for 50 equal intervals from 0.01 to 0.5, and finding the 50 corresponding Tini values that satisfied the above stated rate identities gave the optimum reactor for each value of ÃŽÂ ±. The best cold-shot reactor specification was easily deduced from the setup which had the smallest overall catalyst volume. Results and Discussion 5.1. Single Plug-flow Reactor 5.1.1. Varying the ammonia composition in the feed Figure 7: A graph displaying the effect of ammonia feed mol % change on catalyst volume The composition of ammonia in the feed was changed while keeping the molar feed rate constant. (Change ratio: 4% decrease in NH3 = 1% increase in N2 + 3% increase in H2, etc). Figure 7 shows that decreasing the ammonia fraction from the original 8 mol % (while increasing the reactant mol %) lead to a significant drop in catalyst volume required. The greater concentration of reactants favoured the forward reaction, increasing the rate of formation of ammonia, leading to a smaller catalyst volume. When the ammonia fraction was too high (à ¢Ã¢â‚¬ °Ã‚ ¥0.16), the initial concentration of reactants was insufficient to achieve the required extent. Also, as the partial pressure of ammonia increased in the reactor, a greater proportion of the catalysts active sites became blocked and the forward rate decreased, increasing the required catalyst volume 7. It was decided to keep the mol % of ammonia in the feed at 8% in subsequent simulations; although the lowest mol % of ammonia in the feed produces the minimum catalyst volume, it is impractical for this to occur since ammonia is normally recycled in industrial reactors 8. 5.1.2. Varying the reactor cross-sectional area Figure 8: A graph displaying the effect of cross-sectional area on catalyst volume Figure 8 shows that increasing the cross-sectional area reduced the catalyst volume, but this reduction was more significant only at the smaller area values. Increasing the area increased the number of catalyst pellets available at the reactor cross-section; therefore a greater reaction rate was initially facilitated as the volume increased. However, the inlet flow was fixed, and beyond a certain area, the flow into the reactor did not utilise the additional pellet area at the cross section; and thus the catalyst volume was less affected. The cross sectional area for the remainder of the investigation was kept at 2m2 because the increase in cross-sectional area above 2m2 does not justify the relatively minimal reduction in catalyst volume. 5.1.3. Variation of catalyst voidage Table 1: Displays catalyst volumes for different values of catalyst voidage Voidage 0.7 0.6 0.5 0.4 0.3 Vc at ÃŽÂ ¾ = 0.54466 (m3) 23.4642 23.4877 23.5399 23.6728 24.1043 Voidage is the ratio of the catalyst volume to the reactor volume. A larger voidage means a higher catalyst pellet density, thereby allowing a smaller catalyst volume. However, increases in voidage past 0.4 did not contribute to any further significant decrease in catalyst volume. For the purpose of subsequent simulations, the voidage was kept to the original 0.4. 5.1.4. Variation of catalyst diameter Table 2: Displays catalyst volumes for different values of catalyst diameter Catalyst Diameter 0.011 0.009 0.007 0.005 0.003 Vc at ÃŽÂ ¾ = 0.54466 (m3) 23.5881 23.6209 23.6728 23.7675 23.9954 It is seen from the data that varying catalyst diameter had a negligible effect on the catalyst volume, suggesting that although the surface area of each catalyst pellet increased, the number of catalyst pellets decreased, and thus the overall catalyst area did not change significantly. It was decided to stick to the original catalyst diameter provided. 5.1.5. Varying temperature and pressure Figure 8: A graph displaying the effect of inlet temperature on catalyst volume for different isobars As the temperature was increased, a decrease in the catalyst volume was observed. At lower pressures, the gradient of the graph (the change in VC with inlet T) was much higher and therefore inlet temperature was more effective at reducing the catalyst volume at lower pressures. This has some implications with respect to cost; if the inlet temperature is increased, there is an electricity cost associated with operating the reactor at this higher inlet temperature, but there is also a saving due to the reduction in catalyst volume. Figure 9: A graph displaying the effect of inlet pressure on catalyst volume for different isotherms As inlet pressure was increased, the catalyst volume decreased. As discussed in the theory, the increase in pressure favoured the forward reaction, thereby increasing the reaction rate per unit volume of catalyst. However, the capital costs spent on reactor materials able to withstand the high pressures have to be taken into consideration in addition to the greater maintenance cost of the catalyst bed (since a higher pressure reduces the longevity of a catalyst). 5.1.6. Results of single stage simulation Table 3: Displays the specifications and feed conditions the optimized single PFR Feed Composition Cross sectional area (m2) Catalyst Diameter (m) Voidage Extent Temperature (K) Pressure (Bar) N2 H2 NH3 In Out In Out 0.23 0.69 0.08 2 0.0007 0.4 0.5447 624.2 796.0 300 298.6 It can be observed that the pressure drop throughout the reaction was rather insignificant compared to the total pressure in the reactor. The optimization values from the single stage plug-flow reactor were essential for designing dual reactors that utilized interstage or cold-shot cooling as the second reactors were designed to follow the reaction path taken by the single stage PFR. The optimum single stage pressure of 300 bar was also the optimum pressure used for the subsequent simulations; the maximum operating pressure tolerable is 300 bar according to the catalyst degradation conditions specified in the simulation objectives. 5.2. Interstage Cooling Figure 10: A graph displaying the extents of reaction for different temperatures. The interstage path for ÃŽÂ ¾1 values of 0.3, 0.34 (optimum), and 0.4 are displayed along with the locus of maximum reaction rates, the equilibrium curve and the locus of rin = rout. Results were obtained for 10 extents between 0.3 and 0.4; these are displayed in the appendix. From the graph above, it can be seen that for all three extents; 0.3, 0.34, 0.4, the reaction in the first reactor moved past the locus of maximum rates and the locus of rIN = rOUT and then approached the equilibrium curve, thereby maximizing conversion. The outlet stream was then cooled to a point along the path taken by the volume minimizing single PFR. The graph thus shows that performance optimization occurred in the interstage cooling design as catalyst volumes in both reactors were minimized. The range of chosen extents for the first reactor, 0.3 0.4 kmol s-1, also proved to be robust, providing well performing reactors with small catalyst volumes (where all reactors had a combined catalyst volume less than half of that of the single stage reactor). Volume reached a minimum of 3.94 m3 when the extent was fixed at 0.34 kmol s-1 with an inlet feed temperature of 737.1K. 5.3. Cold-shot Cooling Table 4 Conditions and results for the optimum cold-shot system Extent Achieved Temperature (K) Catalyst volume (m3) 1st 2nd 1st 2nd In Out In Out Vr1 Vr2 0.2958 0.2489 699 795.769 717.172 796.407 1.523 3.254 (Vc 1 Vc 2 = 1st 2nd Catalyst volume respectively) Figure 11: Catalyst volume minimizing temperatures at specific alpha values During simulation of the cold-shot cooling reactor design, it was deduced that the range of ÃŽÂ ± was restricted from 0.01 to 0.38, beyond which the bulk of the reaction would occur in one of the two reactors, making the other redundant. Optimally, ÃŽÂ ± should be somewhere between the limits of the range; for ÃŽÂ ± = 0.19 and feed temperature at 699K, a minimum overall volume of 4.78 m3 was achieved. It is seen from the graph above that as ÃŽÂ ± deviates from 0.19 and tends towards 0, the first reactor behaves more like a single PFR. The same happens to the second reactor as ÃŽÂ ± tends towards the ÃŽÂ ± upper limit. Increasing the initial feed temperature causes ÃŽÂ ± to increase in order for optimization to occur, while a decrease would bring about the opposite effect. This is because a larger fraction would be required to cool the output from the first reactor to achieve optimization should the reactor operate at a higher temperature. The contrary is true; with a larger ÃŽÂ ±, the initial feed temperature cannot be too low as excessive cooling of the second fraction would occur. 6. Conclusion It can be concluded that the investigation w

Diversity Training Manual

Diversity Training Manual: Part 1 Abstract This paper is the first part of a training manual that will help employees to have a better understanding of diversity in the work place and how to act towards different diversity issues that may arise in the workplace. It will also give current statistics and recent trends of the demographics in the United States as well as the forecasted trends. Also included will be a rough outline of the entire contents of the manual and the table of contents for the manual. Table of Contents Introduction: Section 1: Current Statistics of the Demographics of the Population in the United States Section 2: Recent Trends of the Demographics in the United States a)Immigrants versus natives b)Religion c)Age d)Race Section 3: Forecasted Trends of the Demographics in the United States Section 4: Forms of discrimination a)Legislation covering discrimination b)Customs and values of different groups c)How to deal with differing values and customs d)Legislation affecting supervisor regulation Introduction What is diversity? Diversity is simply everything that makes people different from one another. It refers to different languages, races, age groups, gender, and religion (Bucher, 2010). A few decades ago the main part of the workforce was white men between the ages of 20 and 60. Now there are a larger number of women joining the work force along with younger people between the ages of 16 to 26 (AIU, 2011). There was also a mostly white workforce. Due to immigrants coming in from other countries, there are now other races in the workforce (Bucher, 2010). These immigrants are bringing with them different work habits, different languages and different religions. If the amount of immigrants continues at its present rate, it is projected that by the year 2050 the population of the United States will be 438 million and 82% of the population will be new immigrants arriving in the United States and their descendants that will be born as U. S. citizens (Passel & Cohn, 2008). As the number of immigrants increases, the number of the non-Hispanic white population will decrease. It has been forecasted that by the year 2050 whites will be a minority group. They will only account for 47% of the population where the Hispanics and Asians will be the majority (Passel & Cohn, 2008). Another demographic change that is going to take place is the age of the work force. With all the advances being made in the medical field people are living longer and are able to work longer. The workforce used to be made of men that had similar capabilities that were between the ages of 20 and 60. Now there are four different age groups to consider, there are the traditionalists that are over the age of 60. Then there are the baby boomers that are between the ages of 44 and 60. Generation X is between the ages of 26 and 44 and then there is generation Y that is younger than 26. All these age groups need to be communicated to differently but have to be treated equally (Pierce, 2011). This training manual is going to help everyone to think outside of their own culture and learn how to communicate with others that do not always share the same views. References AIU Online (2011). Unit 1: Current Workforce Make-Up. Retrieved on November 11, 2011 from https://mycampus. com/classroom/Pages/multimediacorsetext. Bucher, Richard D. (2010). Diversity Consciousness Opening Our Minds to People, Cultures, and Opportunities (3rd ed. ). Upper Saddle River, NJ: Prentice Hall. Passel, Jeffery and Cohn, D’Vera (February 11, 2008). Immigration to Play Lead Role in Future U. S. Growth. Retrieved on November 11, 2011 from http://pewresearch. org/pubs/729/united-states-population-projections Pew Research Center (February 25, 2008). The U. S. Religious Landscape Survey Reveals a Fluid Diverse Pattern of Faith. Retrieved on November 11, 2011 from http://pewresearch. org/pubs/743/united-states-religion. Pierce, Rick (2011). Dealing with a Changing Workforce-Supervision in the 21st Century. Retrieved on November 11, 2011 from http://www. businessexperwebinars. com/content/view/593/29/

The Language Codes Identified By Basil Bernstein - 1311 Words

Language is a mixed bag of contradictions which all of society use to address the specific needs of their group. A teacher’s role is extreme in the process of understanding language. It is not enough to merely consider the cultural context in which the speaker emerges, teachers must understand the implications arising from such circumstances, and how they present in the classroom. Socio-cultural factors such as religion, sex and social class, play a significant role in developing a student’s ability to perceive and use language effectively. Renowned theorists Lee Vygotsky, placed an enormous value on students learning from competent social relationships (O’Donnell et al. 2016, 101). Through exploring different language codes identified by†¦show more content†¦4). Language is therefore seen as more than a tool to communicate. Language is an identity used distinctly by different groups to recognise people with parallel values and beliefs who share simila r qualities. Vygotsky explains cognitive development as a ‘socially mediated activity’ which occurs during social interaction (O’Donnell et al. 2016. p. 101). By providing us with this description, Vygotsky is reinforcing the fundamental role our social settings play in contributing to student’s overall development. Gee explains an important factor of why he believes some student s do not succeed in the classroom. A Discourse, as illustrated by Gee is a network of people that shares a similar way of using language, of valuing, acting and thinking, these traits make the group easily identifiable (Green, 2006. p.3). While there are many benefits of belonging to a group, Children can be identified as failures if the Discourse is unfamiliar to them. All cultures are diverse in one aspect or another, many have different beliefs, ideologies and rules which helps us identify different groups (Lawrence, J.A., Brooker, A., Goodnow, J.J 2012 p. 77) . 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As teachers use the elaborated code, workingRead MoreThe Influence of Social Class on Communication2091 Words   |  9 PagesC.A.] and Post Codes where social class can be a rough indicator and may be used for advertising and marketing purposes. Names in society tend to be fashionable and children are often named after popular celebrities in the media such as Kylie, Emily, Beyonce, William, Jamie. For other people a name may be one that is traditionally handed down through generations such as Bill and Jimmy and be linked to social class and help to denote someones age or even religion. Basil Bernstein (1924-2000) attemptedRead MoreAssignment One. â€Å"To View Language As Though It Were An1794 Words   |  8 PagesAssignment One â€Å"to view language as though it were an object, devoid of the social context of its creation and use, is to dislocate it from the field of human interaction within which language derives the full quality of its meanings†¦Ã¢â‚¬  (Grugeon and Gardner 2000: 105) Language is a mixed bag of contradictions which all of society use to address the specific needs of their group. A teacher’s role is extreme in the process of understanding language. It is not enough to merely consider theRead More A discussion of the theory that class-based differences in educational1165 Words   |  5 Pagesthough use of language, ensuring that working class students will be less likely to understand and be understood. This disadvantages working class students, and by creating educational success and failure, legitimises the position of both those at the bottom and top. Basil Bernstein pointed the different speech codes used by the middle and working classes, the ‘restricted code’, which is context bound and requires previous common knowledge between users, and the ‘elaborated code’ which is notRead MoreWhat Is Language Devoid Of The Social Context Of Its Creation And Use1499 Words   |  6 PagesTo make language devoid of the social context of its creation and use is to dislocate it from which it derives its meanings. Thus ridding it of its use with the only benefit of understanding what it is made up of. However, understanding what language is made of and understanding how to use it are two different things, neither of which will give you a complete understanding of language on its own. Using Gardner’s analogy of language being like a fish you dissect as well as observe within its habitatRead MoreHow Does Social Inequality Effect A Child s Educational Achievement?2145 Words   |  9 PagesThe Youth Cohort Study (2007) it shows that middle class children on average perform better than working class children. This is because the poorest and most disadvantaged homes are the ones that achieve the lowest results. This problem has been identified as a policy concern for all three major political parties in the United Kingdom (UK). In December 2007, the government published a plan called ‘Building brighter futures’it has been designed to eradicate child poverty and social division. Ed ballsRead MoreTransformative and Instrumental Views on Education in Australia2769 Words   |  12 Pageshigher socioeconomic status. According to Raewyn Connell et. al., ideology is used for and by â€Å"†¦those in power to maintain and reinforce their positions† (2013, pp. 82). An example of this reinforcement of control can be seen in Basil Bernstein’s Speech Codes Theory. Bernstein had a great interest in the sociolinguistic characteristics of people and how it reflected in their education process. In his study of the relationship between social class and schooling, he surmised that those with a formal orRead MoreOrganisational Theory230255 Words   |  922 PagesEssex CM20 2JE England and Associated Companies throughout the world Visit us on the World Wide Web at: www.pearsoned.co.uk First published 2007  © Pearson Education Limited 2007 The rights of Joanne Duberley, Phil Johnson and John McAuley to be identified as authors of this work have been asserted by them in accordance with the Copyright, Designs and Patents Act 1988. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or byRead MoreOne Significant Change That Has Occurred in the World Between 1900 and 2005. Explain the Impact This Change Has Made on Our Lives and Why It Is an Important Change.163893 Words   |  656 Pageseconomy? Arguments that the new migrants are different and less able to assimilate than those in earlier waves often point to the rise in transnational connections and ease of return travel, the expansion of dual citizenship, the prevalence of home-language media, stronger ethnic and racial differences, the emergence of segregated labor markets that block advancement, and the illegal status of many migrants.69 Most of these arguments rest on weak historical foundations. In nations where assimilationRead MoreStephen P. Robbins Timothy A. Judge (2011) Organizational Behaviour 15th Edition New Jersey: Prentice Hall393164 Words   |  1573 Pagesand Controlled Processing 351 †¢ Interest Level 352 †¢ Prior Knowledge 352 †¢ Personality 352 †¢ Message Characteristics 352 Barriers to Effective Communication 353 Filtering 353 †¢ Selective Perception 353 †¢ Information Overload 353 †¢ Emotions 353 †¢ Language 354 †¢ Silence 354 †¢ Communication Apprehension 355 †¢ Lying 355 Global Implications 356 Cultural Barriers 356 †¢ Cultural Context 357 †¢ A Cultural Guide 358 Summary and Implications for Managers 360 S A L S A L Self-Assessment Library

Analysis Of The Movie The Night - 1181 Words

Phillip had remained proud of himself, cocky even over the performance he had serenaded on Kylee. It was out-of-character for him to do such a thing, but he had obviously been out of character lately, and now he could add actor to his list of ever-growing attributes. As he whistled his way home he was sure that, right at that very moment, due to his compelling persuasion, Kylee was most likely already talking to either, Brooke Adkins or Vera Sutton, informing them of what had just happened to her as she stood out in front her church after Saturday school’s dismissal. And without a doubt, sugar coating the playback to the best of her ability so that he came off in her recount of the encounter as an absolute monster. Phillip was also sure†¦show more content†¦Upon approach, Inez was already outside, sitting on an ancient, blown over, semi-rotten tree. He looked focused, zoned out, as if he were going through steps in his mind of every possible scenario of what could per haps go wrong with their plan. He remained in this taciturn and distant state even as Cassidy and Phillip neared and then stood before him staring befuddled over his comatose nature. â€Å"Inez!† Cassidy said for a third time which finally worked to bring him around. â€Å"Are we ready to do this?† Inez leaned his head back and let it then lull circularly on shoulders as if trying to release stored tension. He then pulled his long black hair back tying it off with an old rubber band. â€Å"Let’s do this,† he then said as he marched off past Phillip and Cassidy making his way over to a large pull cart he had draped with a white cloth. â€Å"Are we going to have to pull that through the woods?† Cassidy asked with a pouting grimace as she pointed an outstretched finger at the cart and waited apprehensively for his answer. â€Å"Well, not if you can make a road magically appear so you can get your old man’s transport back here to pull it,† Inez responded a bit sarcastically as he picked up cart’s handle. Phillip and Cassidy remained paused like they were suddenly standing in quicksand, they then glanced at each other despairingly knowing even the best laid plans didn’t go off without a hitch, and this was the first of what was many they were surely going to see today. Rolling theirShow MoreRelatedAnalysis Of The Movie The Night 996 Words   |  4 Pagesneedles of death! she exclaims. I don t understand you, Bridges. Josh laughs,You saved my life, but then almost gave me a heart attack. Brianna smiles up at him as he laughs. Adoration shines in her eyes, sparkling like stars on the darkest of nights. Blood curdling needles of death? Josh chuckles, So dramatic! Have you ever considered writing? Shut up Ramsay. Brianna smirks, I would be a wonderful author. Josh walks closer to the bed, his heart racing. He sits down in the same spotRead MoreAnalysis Of The Movie The Night 957 Words   |  4 Pagesthem. The figures were grim in appearance, green, ribs protruding from the side, hollow eyes, and open mouths that were letting out a hollow scream. Our class, 30 in number, shuffled in and took our seats. Once in our seats we were shown a movie. The movie was about the Holocaust, and some of the people who were fortunate enough to survive it. The film covered significant points that were the crescendos of this time in History. The survivors spoke on their experiences, how they survived, and theRead MoreAnalysis Of The Movie The Night 867 Words   |  4 PagesRichards briefcase it showed the audience that Paul was showing his anger due to the fact he had feeling for Anne. 9. There were a couple unique sound effects in the play. The sound effects was the pounding on the door, the noise of the door across the hall closing, the door knob when it was being unscrewed from the door, a baby crying, and the jiggle of a dogs collar. The sound cues were executed at the right moments in the play. For example, when the lady from 4a came into 4b’s apartment to talkRead MoreAnalysis Of The Movie The Night 858 Words   |  4 Pagesreally missed the great adventure, which not only added gas to her fire but it made her go on a rage. This rage lasted for weeks and weeks and she ended up destroying her room just to show her parents how bad she wanted to go to the carnival. The night that she destroyed her room a little leprechaun about the same size of her foot with a face that looked cute, according to Lucy which made it easier for the leprechaun to convince her into going with him to the carnival. The leprechaun ran into herRead MoreAnalysis Of The Movie The Night 1065 Words   |  5 PagesAt Once Again Antiques, Zach hesitated under the store’s overhang and stomped the snow from his boots. In the display window, a vintage jukebox played Deck the Halls, and next to it, a color wheel revolved in front of an aluminum Christmas tree. He removed his Stetson and tapped it against his pant leg, releasing a dusting of snow from the dark felt brim. Whatever was supposed to happen would be today, December 24th. For Gran’s sake, he’d ask an eye-catching, yet complete stranger to accompany himRead MoreAnalysis Of The Movie The Night 1047 Words   |  5 Pagestrying my best (and failing miserably) to keep the tears out of my eyes. Fairly recently, I assumed that role for another friend. The symbolism, it kills me. And yet here I am, sitting in a Starbucks at 7:04 in the morning because I didn’t sleep last night and instead watched the last season of FRIENDS and cried, wondering when I’d find someone who loved me as much as Ross loves Rachel, as much as Chandler loves Monica, and wondering when I would ever love someone in the same way. Wondering if it’d happenRead MoreAnalysis Of The Movie The Night 898 Words   |  4 Pagesâ€Å"Here he is,† Mindy said happily when Zack arrived for his detention. Zack looked around. The only people there were Miss Devasquez and Mindy. He knew about the â€Å"special detention† that Miss Hartick had put together, and he had expected that he would have to go through the same thing. It didn’t look that way though. He was glad about that at least. He even let himself expect that this might be a regular detention. He asked, â€Å"It’s just us?† â€Å"It’s just us,† Miss Devasquez said. Playfully, she saidRead MoreAnalysis Of The Movie The Night 925 Words   |  4 Pagesher friends enjoyed the use of the house owned by her best friend’s parents. They had the run of Megan’s family beach home in Playa Del Rey for the holiday week. Megan’s parents were on location in Canada for two months. Her dad and mom were on a movie shoot filming a creature feature. As a result, the friends felt they were on one long slumber party, similar to the ones they enjoyed as teenagers. Only at this juncture of their life, wine and men liven up the week-long gathering. The young womenRead MoreAnalysis Of The Movie The Night 978 Words   |  4 PagesBy the following Tuesday night she was ready to resume taking after having several nights of poor sleep. The doorbell rang about 1A.M., I got up in time to see Kevin handing an almost nude Susan a Sunday. All she had on was her pink panties, hmm..she had pajama s on when she went to bed. At first I thought she might be awake, but her blank expression led me to believe she was in ambient trance. How did Kevin know to bring a Sunday or did he just chance it? Why was Susan naked? Did she call KevinRead MoreAnalysis Of The Movie The Night 1673 Words   |  7 Pagesvisiting her friend Melinda who was staying with her father at his place in Elmira, NY. But, after having arrived a day early and not wanting to be a burden. Pamela decided to make a stop at the Ramapo Valley resort just outside of Monticello for the night. Melinda, who had also been a former working girl, had left Miami six years earlier when she had chosen to turn her life around by getting clean. At the time, a local pimp who only went by the name of â€Å"Rangel† had tried to kill her for stealing