Optimization of Distillation Column Experiment

Optimization of Distillation Column Experiment Optimization of distillation column in terms of energy consumption and CO2 emission Sina Radfar[1]* * Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran Abstract The distillation is one of the energy consuming process in worlds process industry. Therefore, there must be approach for optimal use of energy and reduction of harmful gas emission such as CO2. The Aspen Plus Column Targeting Tool (CTT) options in a simulation environment can help reduce the use of energy and hence CO2 emissions. Also, the Aspen Plus Carbon Tracking (CT) together with the Global Warming Potential (GWP) options can quantify the reduction in CO2 emission. The CTT is based on the practical near minimum thermodynamic condition approximation and uses thermal and hydraulic analyses of distillation columns to identify the objects for possible column modifications. By using the CO2 emission factor data source and fuel type, the CT estimates the total CO2 emission and net carbon fee/tax on the use of a utility. In this study, by using these Aspen plus options and also using energy efficient distillation column, namely HIDiC, the way for optimization of energy consumption and CO2 emission expressed and the results compared with conventional distillation column namely RADFRAC. Finally, it was concluded that despite lower energy consumption in HIDiC, the rate of CO2 emission is twice the conventional column. Keywords: Energy-efficient Distillation column, Column targeting tool, Column grand composite curves, Carbon tracking, Global warming potential. Distillation is the most widely used industrial separation technology and distillation units consume a significant part of the total heating energy in the worlds process industry. The U.S. Department of Energy estimates that 40,000 distillation columns are presently in operation in the United States and consumes 4.8 quadrillion BTUs of energy 40% of the processing energy used in refining and continuous chemical processes [1] [2]. Although distillation is by far the most widely applied separation technology, its major drawback is the inevitable reduce of energy due to the temperature difference between the reboiler and condenser; which leads to a low overall thermodynamic efficiency of a distillation column, e.g., below 10% [3]. Therefore, improving the energy efficiency of this unit operation is important to achieving energy savings of plant. Aspen Plus Column Targeting Tool (CTT) is based on the Practical Near-Minimum Thermodynamic Condition (PNMTC) approximation representing a pra ctical and close to reversible operation [4]. It uses thermal and hydraulic analyses of distillation columns to identify the objects for possible column modifications in: 1) stage feed location, 2) reflux ratio, 3) feed conditioning, and 4) side condensing and/or reboiling. These modifications can reduce the utility usage and improve energy efficiency. The Column Targeting Tool (CTT) option can help reduce the use of energy, while the Carbon Tracking (CT) and Global Warming Potential (GWP) options can help quantify the reduction in CO2 emission in a simulation environment. Sustainability has environmental, economic, and social dimensions and requires the responsible use of resources such as energy and reduction in CO2 emission [5]. In this study, the energy and CO2 emission as the pollutant are used as the sustainability metrics in distillation column operations. This study demonstrates how to reduce and quantify the energy consumption and CO2 emissions by using the commercial software, Aspen Plus. 2.1. Column targeting tool A practical near-minimum thermodynamic condition purposes a reversible column operation at minimum reflux with appropriate heat integration and hence negligible entropy production. To achieve this, heaters and coolers with appropriate duties must be operate at each stage; so that the   minimum reflux ratio would be result, and hence the operating line approaches the equilibrium curve. This would correspond to the distribution of reboiling and condensing loads throughout the column, and hence over the temperature range of the operation. The Aspen Plus column targeting tool for thermal analysis and hydraulic analysis is helpful in identifying the objects for appropriate modifications in order to reduce utility and capital costs by improving thermodynamic driving forces, improve energy efficiency, and decrease column bottlenecking. The column-targeting tool of Aspen Plus produces the enthalpy and the exergy loss profiles based on the practical near-minimum thermodynamic condition . The enthalpy estimations take into account the thermodynamic losses due to column design and operating conditions, such as pressure drop, multiple feed and side products, as well as side heat exchangers. The pinch point in distillation requires that there should be no side reboiling below the pinch and no side condensing above the pinch in heat-integrated columns [6]. The CTT can be activated by using the related option on the Analysis / Analysis Options sheets, as shown in Figure 1. Figure 1: Analysis / Analysis Options to activate the Column Targeting Tools (CTT). Results of the column targeting analysis depend strongly on the selection of light key and heavy key components in Targeting Options (Figure 2) [7]. Figure 2:   Analysis / Targeting Options with key component specification. Before designating light key and heavy key components for the column (refer to Table 1), the user runs the simulation and considers the column split-fractions, composition profiles, and component K-values displayed by the Plot Wizard. In case of multiple light and heavy key, if there is more than one light key component, the heaviest of them is selected as the light key; similarly, if there is more than one heavy key component, the lightest of them is selected as the heavy key. In the default method for this study, key components are selected based on the component K-values. The CTT has a built-in capability to select light and heavy key components for each stage of the column [4] [7]. Table 1: Selection of key components within the Targeting Options. Method Use When User defined Allows you to specify the light key and heavy key components. Based on component split fractions This method is best for sharp or near-sharp splits fractions in product streams. Based on component K-values This method is best for sloppy splits. Based on column composition profiles In principle, this method is similar to the K-value based method. It is best suited for sloppy splits and it is, in general, inferior to the K-value based method. 2.2. Column Grand Composite Curve To analyze the energy-saving potential of distillation columns, it is common to form the temperature-enthalpy and stage-enthalpy curves, called column grand composite curves. Column grand composite curves (CGCC) are based on the practical near-minimum thermodynamic condition approximation proposed by Dhole and Linnhoff [8] [9], and show the theoretical minimum heating and cooling duties within the temperature range. The stage-enthalpy calculations take into account losses or inefficiencies caused by the actual column design, such as pressure drops, multiple side products, etc. Column grand composite curves display the net enthalpies for the actual and ideal operations at each stage, and the cold and hot utility requirements. Therefore, the area between the actual and the ideal operations in a column grand composite curve should be small for a thermodynamically efficient operation. Column grand composite curves are formed by solving the mass and energy balances for a reversible column operation. Simulation packages such as Aspen Plus are making column grand composite curves readily available even for multicomponent, complex distillation column operations such as crude oil distillation. These simulators enable the process engineer to assess the performance of an existing operation and explore the possibility of reducing utility costs by improving efficiency in energy usage. Column grand composite curves can identify targets for restructuring and modification, and may be helpful in suggesting retrofits. Some of the retrofits consist of feed conditioning (preheating or precooling), feed splitting, reflux adjustments, and adding side condensers and reboilers. These retrofits purpose a practical near-minimum thermodynamic loss [6]. 2.3. Thermal analyses Thermal analysis ability is useful in identifying design objects for enhancements in energy consumption and efficiency [8] [10] [11]. In this ability, the reboiling and condensing loads are distributed over the temperature range of operation of the column. The thermal analysis of CTT produces Column Grand Composite Curves and Exergy Lost Profiles. The user makes changes to column specifications until the profiles look right based on the column targeting methodology. The CGCCs are displayed as the stage-enthalpy (S-H) or temperature-enthalpy (T-H) profiles. They represent the theoretical minimum heating and cooling requirements over the stage or temperature range of separation. This approximation takes into account the inefficiencies introduced through column design and operation, such as pressure drops, multiple side-products, and side strippers. Using the equilibrium compositions of light (L) and heavy (H) key components obtained from a converged simulation, we estimate the minimum vapor and liquid flow rates leaving the same stage with the same temperatures from the following mass balances: (1) (2) where and are the equilibrium mole fractions of liquid and vapor streams, and the minimum amounts of the liquid and vapor streams, and the distillate. The enthalpies for the minimum vapor and liquid flows are obtained from the molar flow ratios (3) (4) where and are the molar flows of equilibrium, and the enthalpies of equilibrium vapor and liquid streams leaving the same stage, respectively. From the enthalpy balances at each stage, the net enthalpy deficits are obtained   Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   (before the feed stage) (5)   Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   (after the feed stage) (6) After adding the individual stage-enthalpy deficits to the condenser duty, the enthalpy values are cascaded, and plotted in column grand composite curves. This is called the top-down calculation procedure, which will be the same as the bottom-up calculations for a stage without any feed. At the feed stage, mass and energy balances differ from a stage without feed, and finite changes of composition and temperature disturb the reversible operation. For the two procedures to yield similar results, the enthalpy deficit at the feed stage becomes (7) The values of and may be obtained from an adiabatic flash for a single phase feed, or from the constant relative volatility estimated with the converged compositions at the feed stage and feed quality. This procedure can be reformulated for multiple feeds and side products as well as different key components. A pinch point near the feed stage occurs for nearly all binary ideal mixtures. However, for nonideal multicomponent systems, the pinch point exists in rectifyingand stripping sections. A horizontal distance between the column grand composite curve pinch point and the vertical axis represents excess heat, and therefore the scope for reduction in reflux ratio. For smaller reflux ratios, the column grand composite curve will move toward the vertical axis, and hence reduce the reboiler and condenser duties, which may be estimated by (8) where is the heat of vaporization. The horizontal distance of the column grand composite curve from the temperature axis determines the targets for installing a side reboiler or side condenser at suitable temperatures (or stages). On the other hand, a sharp change in the enthalpy represents inappropriate feed conditioning, such as poor feed quality or nonoptimal temperature. For example, a sharp change on the reboiler side may be due to a subcooled feed, and a feed preheater can be installed. Feed conditioning is usually preferred to side condensing or reboiling, since the side heat exchangers are effective at suitable temperature levels only. Exergy () is defined the maximum amount of work that may be performed theoretically by bringing a resource into equilibrium with its surrounding through a reversible process. (9) where and are the enthalpy and entropy, respectively, and is the reference temperature, which is usually assumed as the environmental temperature of 298.15 K. A part of accessible work potential is always lost in any real process. Exergy losses represent inefficient use of available energy due to irreversibility, and should be reduced by suitable modifications [8]. Exergy balance for a steady state system is (10) where is the shaft work. As the exergy loss increases, the net heat duty has to increase to enable the column to achieve a required separation. Consequently, smaller exergy loss means less waste energy. The exergy profiles are plotted as stage-exergy loss or temperature-exergy loss. In general, the exergy loss profiles can be used as a tool to examine the degradation of accessible work due to [7] [8]: Momentum loss (pressure driving force) Thermal loss (temperature driving force) Chemical potential loss (mass transfer driving force) 2.4. Hydraulic analysis Hydraulic analysis helps identify the allowable limit for vapor flooding on the Tray Rating Design/ Pressure drop or Pack Rating Design/Pressure drop sheets. Tray or packing rating information for the entire column is necessary to activate the hydraulic analysis. In addition, allowable flooding factors (as fraction of total flooding) for flooding limit calculations can be specified. The default values are 85% for the vapor flooding limit and 50% for the liquid flooding limit. The liquid flooding limit specification is available only if the downcomer geometry is specified. The allowable limit for liquid flooding (due to downcomer backup) can be specified on the Tray Rating/Downcomers sheet [7]. The hydraulic analysis ability helps understand how the vapor and liquid flow rates in a column compare with the minimum (corresponding to the PNMTC) and maximum (corresponding to flooding) limits. For packed and tray columns, jet flooding controls the calculation of vapor flooding limits. For tray columns, parameters such as downcomer backup control the liquid flooding limits. Hydraulic analysis produces plots for flow rates versus stage and can be used to identify and eliminate column bottlenecks [7]. Graphical and tabular profiles (Figure 3 and Figure 4) help identifying targets and analysis for possible modifications by the user. The Plot Wizard (Figure 4) produces various plots including the types: Thermal analysis: The CGCC (T-H) Temperature versus Enthalpy Thermal analysis: The CGCC (S-H) Stage versus Enthalpy Exergy loss profiles: Stage versus Exergy loss or Temperature versus Exergy loss Hydraulics analysis: Thermodynamic Ideal Minimum Flow, Hydraulic Maximum Flow, Actual Flow Figure 3: Tabular profile for hydraulic analysis.   Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   Figure 4: Plot Wizard displays several plots as a part of Analysis and Column Targeting Tool. 2.5. Heat-Integrated Distillation Column (HIDiC) As distillation is one of the most energy-intensive units in chemical process industries, many efforts have been focused on the development of distillation systems and distillation equipment in order to improve its energy efficiency. Many complex distillation configurations have been studied and proposed to improve the energy efficiency. For example, the dividing-wall distillation column or the Petlyuk column is a complex distillation scheme which has been successfully commercialized after several decades of research. More recently, another distillation scheme called the internally heat-integrated distillation column (HIDiC) has received extensive attention. Unlike the Petlyuk column, the key idea of the HIDiC leading to considerable energy savings is the combination of direct vapor recompression scheme (VRC) and the heat integration between two diabatic sections. The diabatic section is a column section which allows heat transfer to enter or leave its stages. Its purpose is to distribute exergy loss from the main condenser or reboiler to all stages in the section, hence reducing the main utility load and the overall exergy loss of the section. If two diabatic sections with opposite directions of heat transfer are integrated, the energy requirement along both sections can then be saved. As shown in Figure 5a, the rectifying and the stripping sections are separated by the feed tray. Instead of having heat rejection only through the main condenser and heat supply through the main reboiler, the total heat rejection is distributed along the rectifying section, while the stripping section absorbs this amount of heat with similar distribution along the column. A compressor and a throttling valve are used to manipulate the pressure difference between both column sections. The rectifying pressure must be sufficiently high to provide a positive temperature driving force between both sections for feasible heat transfer along the columns. This internal heat integration between column sections can be achieved using a heat transfer equipment such as heat pipes at any stage location. The design without any thermal utility (as in Figure 5a) is called the ideal HIDiC. This scheme requires only electricity or mechanical power for compressor. However, a trim-condenser and/or trim-reboiler may be installed at the top of the rectifying and/or the bottom of the stripping sections, respectively, to enhance the process operational flexibility. The general HIDiC scheme with any trim-condenser and/o r trim-reboiler is known as the internally heat-integrated distillation column (Figure 5b) [12]. Figure 5: The ideal HIDiC (a) and the internally heat-integrated distillation column (b). 2.6. Sustainability metrics 2.6.1. Potential environmental impact This study quantifies the sustainability metrics of potential environmental impacts, which is the emissions per unit mass of product and carbon tax, by using the Aspen Plus options of (1) Carbon Tracking (CT) and (2) Global Warming Potential (GWP). Carbon tracking: In each utility block, carbon tracking allows the calculation of CO2 emissions after specifying CO2 emission factor data source and ultimate fuel source from built-in data. The CO2 emission factor data source can be from European Commission decision of 2007/589/EC or United States Environmental Protection Agency Rule of E9-5711 [13] [14]. This source can also be directly specified by the user. In this example, CO2 emission factor data source is US-EPA-Rule-E9-5711 and the fuel source is natural gas as seen in (Figure 6). The utilities used in the column include cooling water and steam. The Results Summary / Operating Costs / Utility Cost Summary sheet displays the total heating and cooling duties as well as their costs. The rate and cost of CO2 emission results would be available within the Results Summary / CO2 Emissions. Figure 6: Utilities / U-2 / Input / Carbon Tracking / Calculate CO2 emissions. Global warming potential: Aspen Plus reports greenhouse gas emissions in terms of CO2 equivalents of Global Warming Potential (GWP). CO2 is one of the greenhouse gases that cause around 20% of GWP. To use this feature one can create a property set. Prop-Set properties report the carbon equivalents of streams based on data from three popular standards for reporting such emissions: 1) the IPCCs 2nd (SAR), 2) 4th (AR4) Assessment Reports, and 3) the U.S. EPAs (CO2E-US) proposed rules from 2009 (Table 2) [13] [14]. Prop-Set properties are reported in stream reports after selected: Report Options / Streams / Property sets. The Setup / Calculation Options / Calculations sheet activates the standards for Global Warming Potential as well as Carbon fee/tax which set as USEPA (2009) and 5 $/lb, respectively. The Results sheet of each Utility block displays the CO2 equivalents emitted by this utility in each unit operation block where it is used. Table 2: Standards for reporting CO2 emissions. Standards for reporting CO2 emissions Prop-Set properties corresponding to each standard IPCC SAR (1995) CO2E-SAR IPCC AR4 (2007) CO2E-AR4 USEPA (2009) CO2E-US 2.6.2. Energy intensity This study calculates the sustainability metrics Energy intensity as nonrenewable energy per unit mass of products by using the Aspen plus Column Targeting Tool abilities of Thermal Analysis and Hydraulic Analysis. 2.7. Methods for optimization 2.7.1. Modifying the feed stage location In Aspen Plus, the condenser is the first stage, while the reboiler is the last stage. The S-H plots of CGCC can identify distortions because of inappropriate feed placements. The distortions become apparent as significant projections at the feed location called the pinch point due to a need for extra local reflux to compensate for inappropriate feed placement. A correctly introduced feed removes the distortions and reduces the condenser and reboiler duties. If a feed is introduced too high up in the column, a sharp enthalpy change occurs on the condenser side on the S-H CGCC plot; the feed stage should be moved down the column. If a feed is introduced too low in the column, a sharp enthalpy change occurs on the reboiler side on the S-H CGCC; the feed stage should be moved up the column [10]. 2.7.2. Modifying the reflux ratio The horizontal gap between the T-H CGGC pinch point and the ordinate represents the excess heat, and therefore, the scope for a reduction in reflux ratio [7]. As the reflux ratio is reduced, the CGCC will move towards the ordinate and hence reduce both the reboiler and condenser duties. However, to preserve the separation, the number of stages must increase. 2.7.3. Feed conditioning The need for an adjustment of feed quality can be identified from sharp enthalpy changes on the S-H or T-H CGCC plots. If a feed is excessively sub-cooled, the T-H CGCC plot will show a sharp enthalpy changes on the reboiler side, and extent of this change determines the approximate feed heating duty required. If a feed is excessively over-heated, the T-H CGCC plot will show a sharp enthalpy changes on the condenser side, and extent of this change determines the approximate feed cooling duty required. Changes in the heat duty of pre-heaters or pre-coolers will lead to similar duty changes in the column reboiler or condenser loads, respectively. 2.7.4. Side condensing or side reboiling Feed conditioning is usually preferred to side condensing or side reboiling. Side condensing or side reboiling is external modification at a convenient temperature level. The scope for side condensing or side reboiling can be identified from the area below and/or above the CGCC pinch point (area between the ideal and actual enthalpy profiles). This area could be reduced by integrating side condensing and/or reboiling on an appropriate stage [15]. If a significant area exists above the pinch, a side reboiler can be placed at a convenient temperature level. This allows heat supply to the column using a low-cost hot utility, hence lowering the overall operating costs. If a significant area exists below the pinch, a side condenser can be placed at a convenient temperature level. This allows heat removal from the column more effectively and by a cheaper cold utility, hence lowering the overall operating costs. Use of side condensing or reboiling cause increasing of a condenser and reboiler duties, an increase of CO2 emission, and an increase of costs (due to installing heat exchanger). Therefore, should be careful of using this. By using maintained above methods, CGCC plots achieved. Referring to these plots, optimal condition is where ideal and actual plots are overlapping (for S-H and V-S plots) or minimum exergy loss is obtaining (for S-E plot). Therefore, modifying conditions (such as feed stage location, reflux ratio, feed conditioning, and side condensing/reboiling duty) continued until overlapping or minimizing achieved. In the following, schematic of simulations and input data along with their results are coming. Figure 7: Simulation of HIDiC configuration.

Learning In A Highly Structured Environment Essay

Some people say that education is best imparted in a desciplined and structured environment, while others say that education should be the product of freedom and spontaneity. This issue, as stated in the passage, is debatable but a closer examination brings out some factors which certainly reveals that education is most effective when the students are allowed to express themselves. First, it is imperative that students, the recipent of knowledge, should always stay keenly interested to receive that knowledge. there is a very old saying that â€Å"all work and no play makes Jack a dull boy’. Hence, the educators should always try and keep a playful environment in their classes or institutes. Seggregating study and play hours will, however, have an adverse effect, as it will make children look forward to the play hours and hence not give attention in the study hours. Indeed, the best solution is to make the very study environment itself full of fun activities, thus encouraging the students to engage in more creative activities through out their study hours. Also, this approach will also stop the students from craving for time separately when they can enjoy themselves. Furthermore, such an environment will also enable the teachers to recognize the strenghts and weaknesses of their students more correctly. The teacher student relationship would be more like friends, and students will be encouraged to share everything with them. Second, we must keep in mind that we live in an ever changing society. And the rapid change demands rapid adaptations. Although formal education is a must for such adaptations, too much of it can be harmful. Children must be aquanted with diverse situations from their childhood, but without forcing it on them. Thus, the best way to do that is by giving them an flexible educational system. It would enable them to recognize the best way how to deal with various situations and overcome difficulties, which would be a great boon when they grow up. For example, a society would be much more healthy and dynamic if, rather than teaching each oif 100 students to solve a math problem in the same way, educators encourage students to try different methods and adopt the one that suits them best. Third, and perhaps the most important, is that education is not gained through bookish knowledge only. That sort of knowledge can only take a person upto a certain point, but going beyond would require the personal experience and knowledge of the individual. Since, it is a known fact that children without education have more diverse ideas than grown ups with years of education, letting the former express their ideas is certainly the best way to educate them. For example, Rabindranath Tagore, the famous poet and nobel laureate, is still considered one of the best poet of all time, yet he had not received any formal education as a child. A person can have all the theoritical knowledge about a guitar, but practicing with a guitar will actually enable him to play it.Discipline, routine are virtues that cannot be done without, but they should be allowed to grow in a person naturally, and not forcibly. To conclude, i would say that although formal education in a disciplined, routine environment does have its own good points, they are certainly outweighed by the approach of imparting education in an informal environment. Thus, i strongly believe that true education can only be given when the students are allowed to express themselves in a free, unbound atmosphere, which will enable them to achive great heights in future.

Moments of dramatic tension Essay

Choose two scenes which you consider to be particularly interesting moments of dramatic tension. Write about why they are especially dramatic and why they are important in the play  For this essay I am going to concentrate on the scene at the end of act one in ‘A View from the Bridge’ by Arthur Miller. In the previous scene Eddie, the main character, has just been to see Alfieri, a lawyer who once represented Eddie’s father and also the narrator for this play, for legal and moral advice on what to do. Eddie is confused and needs someone to kick him in the right direction. I know this because Alfieri said that â€Å"his eyes looked like tunnels†. Eddie feels that Rodolfo is gay and is only after his passport. Another reason Eddie is confused is that he loves Catherine too much. Alfieri has just told Eddie that there is nothing that Eddie can do apart from go to the Immigration Bureau or accept the situation and be happy for the two. This leads into this essay’s scene. It is set in the apartment and opens with Catherine talking about Marco and Rodolfo’s trip to Africa. I believe that the tension begins to grow when Eddie dismisses her excitement. I think this because I believe Eddie is trying to not think about Rodolfo so is saying ‘so what if they have’. It is obvious that Eddie really is interested when he says â€Å"How long that take you, Marco†. Eddie is directing this conversation at Marco and has taken Rodolfo out of the conversation. This shows that Eddie does not like Rodolfo and would rather not think of him. The conversation then carries awhile the tension decreases and the entire family is now into the conversation. Eddie then belittles Beatrice in front of everyone. Beatrice never knew that sardines could not be caught with a hook. I think that this the tension increases with this. Eddie and Beatrice’s relationship has not been smooth lately and this didn’t help.  To release the tension Eddie comes up with a joke. He says that oranges are green and are painted to give them colour. Rodolfo then belittles Eddie by saying pointing out the obvious and saying that lemons are green. I believe he did this because the one of the themes of the book is family loyalty and I think he said this to get revenge for Beatrice. This causes the tension to develop more. Eddie does not want to even talk to Rodolfo let alone be disrespected by him. The tension is then released by Beatrice who changes the topic. This conversation too caries on for sometime and Eddie makes another joke. Eddie says â€Å"they count the kids and there’s a couple extra than when they left?† Rodolfo then says that it is stricter in Italy than it is in Brooklyn. Eddie gets offended by this because Rodolfo is saying that American girls (e.g. Catherine) are easier. I believe that the dramatic tension at this point is higher than any part before it. Miller shows the tension by writing stage directions for Eddie to rise and pace up and down. There is then a conversation between Eddie and Rodolfo. Eddie is comparing Rodolfo and Catherine’s relationship to how one would be in their town in Italy. Beatrice takes Rodolfo’s side in this argument as she knows where it is going. Marco takes Eddie’s side as he doesn’t want any trouble. Marco also tells Rodolfo off and it is clear that Marco wants this argument to end. An argument begins between Beatrice and Eddie then. They are arguin g whether a person is safer during the day or at night. The tension is still on ‘high alert’ when Catherine asks Rodolfo to dance deliberately to annoy Eddie and show him that nothing will come between the two’s relationship. Rodolfo decides not to as he knows that he has already pushed Eddie enough but eventually gives in.  Once again Beatrice lowers the tension by changing the topic. The focus goes back to fishing and it is soon revealed that Rodolfo can cook. Once Eddie hears about it he talks and implies Rodolfo’s homosexuality but Rodolfo takes it as a compliment. Catherine says that he could get a lot of money with these skills and Eddie agrees with her. Eddie says that if he had the skills he would be no where near the waterfront. The tension is rising again as Miller then wrote that Eddie was â€Å"unconsciously twisting the newspaper†. Everyone knows what he is doing so he carries on the speech. While he is talking the newspaper rips in half. I think that this gets everyone nervous and the scene gets more tense. I believe that it signified Eddie getting an idea in his head, like a light bulb above someone on TV when they get an idea. He asks Marco if he wants to go to see a fight next week. He also asks Rodolfo trying to see his reaction. Boxing is a masculine sport and he thought he was asking a ‘woman’. Catherine believes that Eddie is being nice now so she goes to get some coffee. At this point of the scene I think that it is not as tense as it just was but I think that everyone is still nervous. Eddie and Rodolfo then begin to spar and I believe that the audience are now at the edge of their seats waiting to see what will happen. Everyone is impressed thinking that Eddie is making the effort to try to like Rodolfo, but then Eddie comes with a trick attack and lands a blow on Rodolfo. It then becomes clear what Eddie’s intensions were, he wanted an excuse to take his anger on Rodolfo out. Rodolfo does not want to make anything worse so he says that it didn’t hurl him and only surprised him. The tension once again is high and Rodolfo asks Catherine to dance to annoy Eddie. He is sayin g that nothing will get between Catherine and his relationship. Marco then comes and sits a chair in front of Eddie. He challenges him to lift to it from the bottom with one hand. Eddie thinks that this will be easy but soon finds out that it isn’t when he fails. Marco then lifts it above his head to show that he is stronger. Until now Marco had always been on his side by apologising for his brother, Rodolfo, but Eddie has now lost his only supporter. The tension rises as they stare at each other and Marco smiles. Another thing that adds tension here is the stage directions. They say that Marco held the chair ‘like a weapon’. This creates tension as it shows that Marco is threatening Eddie. The scene finished with the tension very high and with Eddie physically threatened. In this scene Arthur Miller has used many ways to show the tension rising. One of these was writing the stage directions. This creates visual images which are really important as they stress the tension; it shows the reader what the audience sees and also shows the tension. Another way he showed the tension was by making the sentences longer. This slows down the pace of the play and created tension. Another way he shows tension is by adding pauses. These add silence and make the audience/reader want to know what happens next. It also gives a moment for the tension to rise.

The Salem Witch Trials Started When “Two Girls Got A Strange

The Salem Witch trials started when â€Å"two girls got a strange illness. Their bodies twitched and shuddered. They spoke nonsense and seemed to be choking† (Holub, What Were the Salem Witch Trials?). This new illness has led to over a hundred of people being accused of witchcraft. Then started with an abundance of series of hearing and prosecutions of people accused of using witchcraft. The trials had taken place in Massachusetts between February 1692 and May of 1693. These trials resulted in the executions of approximately twenty people. Out of those twenty people, fourteen of them were women, and all were executed except one of them that was hung. Salem was not the beginning of witchcraft though. The starting of witchcraft experiences all†¦show more content†¦Straying off the path can lead you so far down another path that you may never have wanted to go down in the first place. Except there is no way back because once you plunge off you can’t expect to cli ng onto someone and expect them to have enough faith for the both of you. Especially if you are going against your beliefs. However, even though he knows leaving his wife is wrong, he still believes that he is still an elect that will go to heaven. [Goodman felt justified in making more haste on his present evil purpose (Hawthorne 3) either way.] It would seem like even though he really doesn’t want to leave his wife, this is something that he really needs to do in order to come back and be fully committed to his faith and his wife. Just as the forest is in some odd way calling out to him. Little does he know as soon as he enters that forest his world is going to be turned upside down forever. Second, how these witch trials correlate to Goodman walking into the woods that night. When Brown decides to follow his curiosity to a sinful journey instead of staying home with his wife, he is truly stepping into the dark side. As he starts to walk he says to himself, â€Å"What if the devil himself should be at my elbow† (Hawthorne 6). Then just like that, the devil happens to appear. Such as if Brown himself is the one that conjured him by thinking about the evil inside of him. That is the beginning of that darkness coming to surface. There is noShow MoreRelatedThe Salem Witch Trials : A Time Of Chaos And Panic Essay1676 Words   |  7 Pages The Salem Witch Trials were a time of chaos and panic. It began in 1692 in Salem Village, Massachusetts. Three girls named Elizabeth (Betty) Parris, Abigail Williams and Ann Putnam began acting strange. They uttered odd words and sounds, threw things and had trance-like states. People were terrified and they didn’t know what to do. 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In Salem, there were young girls who started acting strangely, and they leveled accusations of witchcraft against some of the West Indian servants who were immersed in voodoo tradition. Most of the accusations were against women, and soon the accusations started to shift to the sub stantial and prominent women. Neighbors accused other neighbors, husbandsRead MoreThe Salem Witch Trials Essay1636 Words   |  7 PagesThe Salem Witch Trials Donnell Campbell Throughout history millions of people have been scorned, accused, arrested, tortured, put to trial and, persecuted as witches. One would think that by the time the United States was colonized, these injustices on humanity would have come to an end, but that was not so. In 1692 a major tragedy occurred in America, the Salem witch trials. It all began when a group of girls accused others, generally older women, of consorting with theRead More Salem Witch Trials Essay1622 Words   |  7 PagesSalem Witch Trials Throughout history millions of people have been scorned, accused, arrested, tortured, put to trial and, persecuted as witches. One would think that by the time the United States was colonized, these injustices on humanity would have come to an end, but that was not so. In 1692 a major tragedy occurred in America, the Salem witch trials. It all began when a group of girls accused others, generally older women, of consorting with the devil. The witchcraft hysteria in SalemRead MoreThe Salem Witch Trials1297 Words   |  6 PagesYou re a liar! I m no more a witch than you are a wizard! If you take my life away, God will give you blood to drink! (Sarah Good). To this day, there is still so much speculation on what was the actual cause of the hysteria that was the Salem Witch Trials. Were any of the women accused, like Sarah Good, actually practicing witchcraft? Or were the accusations placed on these women placed out of spite or jealousy? What caused these young women to have these strange symptoms in the first place? ThereRead MoreWitches And The Puritan Society921 Words   |  4 Pages In the 17th century church was the foundation of the people of New England. The main religion of the time was Puritanism which carried over when most of the colonist moved to Massachusetts. The main reason that the colonist moved was to find religious tolerance away from the strict Puritan lifestyle. Puritans believed that the smallest sin could result in a huge misfortune. They were also frowned upon for expressing their feelings and opinions, and were expected to have no individual differencesRead MoreThe Salem Witch Trials931 Words   |  4 Pagesbehind the Salem Witch Trials but I am only going to state the ones I feel most important to me like politics, religion, family feuds, economics, and the imagination and fear of the people. With such a small town there is a lot of talk and conflict among others which begins causing hysteria and eventually got 20 people killed because of it, people who were not in fact guilty. The Salem town was separated into two parts which consisted of the people who wanted to separate from Salem and the thenRead MoreThe Salem Witch Trials2309 Words   |  9 PagesThroughout history, there have been many cases of discriminatory accusations of people, including the Salem Witch Trials. 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