✪✪✪ Simple Condensation Reaction Report

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Simple Condensation Reaction Report



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Gierens , M. Ponater et U. Schumann , « A diagnostic study of the global distribution of contrails » , Theor. Stordal , G. Myhre , E. Stordal , W. Rossow D , D. Lee , D. Arlander et T. Svendby , « Is there a trend in cirrus cloud cover due to aircraft traffic? Lee , David W. Faheyb , Piers M. Forsterc , Peter J. Newtond , Ron C. Wite , Ling L. I have a question about the first step in an SN1 reaction — the leaving group leaves. What causes the leaving group to want to leave? Is this action set in motion by heat, light or some other energy source? At any given moment the bond between the carbon and the leaving group is oscillating like two balls connected by a spring, and the bond length is alternating between being shorter than normal and longer than normal.

Now imagine the energy as that bond extends to its longest length. The carbon will have a partial positive charge delta plus and the leaving group will have a partial negative charge delta minus. If the carbon is able to stabilize positive charge very well e. So the answer would be no. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Notify me via e-mail if anyone answers my comment. This site uses Akismet to reduce spam. Learn how your comment data is processed. The SN1 Reaction Mechanism Previously we saw that there are two important classes of nucleophilic substitution reactions , which differ in their rate laws, dependence on substitution pattern, and the stereochemistry of the products.

Stereochemistry Of The SN1 Reaction: A Mixture of Retention and Inversion is Observed If we start with an enantiomerically pure product, that is, one enantiomer , these reactions tend to result in a mixture of products where the stereochemistry is the same as the starting material retention or opposite inversion. Advanced References and Further Reading Polar Aprotic? Are Acids! What Holds The Nucleus Together? Thanks for the catch — and glad you find it useful! Would you please write a textbook — I would gladly buy it! Values 1. Process flow diagram given in Figure 2. For the sake of simplicity the reboiler and condenser are embedded in to towers.

Production method is catalytic dehydration of methanol over an acid zeolite catalyst. A packed bed reactor R which is filled with solid catalyst particles is used to produce dimethyl ether. Fresh methanol, Stream 1, is combined with recycled reactant, Stream 13, and pre-heated by the first heat exchanger E The stream leaving reactor, Stream 7, is then cooled E prior to being sent to the first of two distillation columns: T- and T DME product is taken overhead from the first column Stream The second column separates the water from the unused methanol. The methanol, Stream 13, is recycled back to the front end of the process, and the water is sent to wastewater treatment to remove trace amounts of organic compounds.

Layout Plot Plan Equipment Schedule Sheet Item No. Condenser Wall thickness, cm Includes corrosion allow. Manufacturing Capital Item No. Equipment Name No. COST 0. In order to achieve this aim, one reactor, two distillation towers with condensers and reboilers, four heat exchangers, three pumps, 2 drums, 6 storage tanks are designed. While equipment necessary for the process is designed, material and energy balance, design heuristics and Chemcad simulation are used. Indirect method, that is, dehydration of methanol is used in this plant to produce DME. Methanol needed for the process is bought as raw material whose purity is Silica alumina is used as catalysis in this process.

The aim is defined as DME production with purity of Natural gas is used as fuel. To begin with, horizontal arrangement is preferred for streams in liquid phase. While energy balance is performed around the drum, heat of mixing is neglected due to the fact that it is expected to be low compared to the flow enthalpies. Secondly, pumps are designed according to heuristic to be able to calculate power consumed both for shaft and driver work.

While pumps are designed efficiency is determined by considering volumetric flow rate and pressure difference around pump according to flow diagram is used in calculation. For pump, shaft work is found as 8. Spare must be considered for all three pumps so two pumps are provided for each pumping purpose. While reactor is being designed, expected conversion which is 0. According to conversion and needed production rate, material balance around reactor is performed.

In addition, energy balance around reactor is conducted and it is assumed that reactor is adiabatic. Temperature calculation gives us outlet temperature of reactor as Since the chosen catalyst is deactivating above C, calculated outlet temperature is considered to be in appropriate range. In addition, it is a significant point that in working temperature range silica alumina is active. While performing material balance feed is assumed as pure methanol. It is a reasonable assumption since water entering reactor is negligible with respect to methanol. Furthermore, in the recycle stream only methanol exists.

Considering volume value of different types of reactor packed bed reactor is more advantageous to use in this process. Weight of catalyst is calculated as kg. Reactor volume is estimated as 4. In this calculated volume, expected conversion which is about 0. By using calculated volume and cross sectional area values, length of reactor can also be found. Furthermore, thickness of the reactor is calculated as 1.

Working pressure of reactor and maximum allowable stress of the material are considered while determining the thickness and material of the reactor. In order to make feed ready to enter the reactor, it must be heated since methanol is stored at 45C. To achieve this aim, a preheater is designed whose function is to heat methanol from 45 C to C. Steam is preferred as heating medium. After that, another heat exchanger is designed to rise the temperature of methanol from C to C where reactor effluent is used as heating medium, so that, steam does not needed for this heat exchanger. As a result, it can be mentioned as beneficial for economic aspect. At the e it of this heat exchanger, reactor effluent is obtained at C. Therefore, cooling of reactor effluent to C for the entrance of separation unit is also made easier and less cooling water is required than it would be if no heat integration is used.

Cooling water is available at 25 C so cooling medium is fed to exchanger at 25 C. Maximum allowable temperature to which cooling water can be reached is 40 C so e it temperature of cooling medium is fixed at 40 C. In addition, another heat exchanger is needed to cool waste water for environmental aspects. While heat transfer area calculations are conducted, overall heat transfer coefficients are determined with respect to nature of process. In addition, separation of methanol from water methanol mixture is necessary to recycle methanol to reactor. Hence, methanol separation tower is designed.

Sieve trays are used for economic purposes. In addition for both columns flooding and weeping are checked and it is seen that there is no such a risk. Because there are three components in the first column, hand calculation is difficult to conduct. At first short cut method is used and then some information is derived from that simulation. SCDS simulation method is used with the help of short cut column simulation results. Chemcad simulation gives ideal number of In order to obtain actual number of stage overall efficiency is calculated by using Gilliland correlation. Overall efficiency and actual number of stages are found as Moreover, minimum number of stages and feed point location are determined by hand calculation for first column.

The results are found as 5 and 4 stages respectively which are close to each other. Feed enters the tower from the middle of the tower. Secondly, methanol and water mixture which is bottom product of first column is fed to the second tower. For this column both hand calculation that is, Mc- Cabe-Thiele method, design heuristics, sizing equations and Chemcad simulation are done. It is neglected that there is a trace amount of DME in the feed of second column. Ideal number of stages is calculated by using McCabe-Thiele method. Mc-Cabe-Thiele method involves its own assumptions which are molal over flow, negligible heat loss and it states that for a mole of vapor which condenses there is a mole of liquid which vaporize.

Mc-Cabe-Thiele method gives 28 ideal numbers of stages which is consistent with Chemcad result. Heuristic revealed at reference list for column design are used to compute total column height and diameter. Column diameter is calculated by hand as 0. Economic analysis is crucial since it is the main factor to determine the success of a project. Economic analysis reveals the amount of profit under operating condition of a plant. Both capital investment cost and production cost must be examined for a successful economic analysis. Chemcad program was used to calculate estimate cost of pumps and CapCost software was used for all other equipment.

It is necessary to specify properties of equipment such as volumes, heat transfer areas, diameters and construction materials to be able to use this program. Moreover, Lang factor method was used for total manufacturing capital. When working capital is considered the main aim was to decrease it as much as possible. To satisfy this aim just in time operation and good planning were provided to the DME production plant.

The important function of just in time operation is to get rid of wasteful activities which increases the working capital but does not contribute the value of the product. Hence, raw material inventory and working process inventory were ignored while working capital calculation was done. In It is effect can be seen by the help of net present value method. If heat integration was not applied, net present value would be lower. Construction material of equipment is selected as carbon steel.

However, for long term operations stainless steel is a better construction material. DME production preliminary design is analyzed economically according to the net income and rate of return on investment results in order to ensure the feasibility of the design. Conclusion The aim of the project is to make preliminary design for DME production including economic analysis. One reactor, two distillation towers with condensers and reboilers, four heat exchangers, three pumps, two drums and six storage tanks are designed and pipeline is constructed according to heuristics and main results are summarized in specification sheets. Either material or energy balance is performed for each equipment. Reactor is designed as a packed bed reactor to carry out dehydration reaction of methanol.

Two of heat exchangers are available to prepare feed before the entrance of reactor. One of the heat exchangers prepares the reactor effluent for the feed of separation unit. The function of other exchanger is cooling waste water which appears at the exit of separation tower. Two pumps are placed to continue the flow of liquids at desired pressure to separation towers from drums and one of the pumps is placed in order to send methanol to feed preheater from methanol storage tank. Storage tanks are constructed in the process so as to make certain amount of feed and product available at any time. Drums exist at the exit of condensers of both separation towers to keep reflux for a certain time.

Pipeline is built between all equipment to convey materials in a safe way during process. Hence, DME is obtained with purity of The designed plant aims to use 60, metric tons of Methanol, with Finally, economic analysis was performed in order to confirm the feasibility for DME production preliminary plant design. Total fixed capital investment, working capital investment, total manufacturing capital and total manufacturing cost were estimated accordingly.

However, in real life it is impossible to perform with such capacity. To conclude, it is reasonable to move a detailed design since preliminary design has given acceptable return on investment, according to interest rate in Turkey. References [1] Timmerhaus, K. Plant Design and Economics for Chemical Engineers, 5th ed. New York: McGraw-Hill. Chemical Engineering Design, 5th ed. Oxford: Elsevier. C, Whiting, W. Peters, Klaus D. Timmerhaus, Ronald West. Analysis, synthesis, and design of chemical processes. Upper Saddle River, N. Appendices Table It includes the inherent safety, hazards and operability analysis HAZOP , material hazards and fire protection.

This can take the form of being protected from the something that causes health or economical losses. The design process is based on the material, fire protection and explosion considering plant, unit layout, storage tanks, distillation towers, reactors and piping system. In order to process operation friendly and economic, process requirements, environmental regulations, location and process materials should be taken consideration. Furthermore, so as to provide good plant operating written instruction in the use of substances and the risk involves.

Protective clothing should be supported personnel. Also, housekeeping and personal hygiene should be checked regularly. Regular medical checkups on employees and chronic effects of materials should be considered. Preventative and total productive maintenance strategy should be applied to equipment. Moreover emergency trainings should be done regularly. Steam traps and security valves should be equipped especially when handling high pressure steam. The detailed information is given below. Shipping regulations Proper shipping name: Dimethyl ether Hazard class number: 2.

Chemcad simulation is more reliable since it uses different algorithms into account therefore Simple Condensation Reaction Report heat Simple Condensation Reaction Report taken as the duty Comparison Of Creon In Jean Anouilhs Antigone in Chemcad Simple Condensation Reaction Report Process Flow Diagram Simple Condensation Reaction Report 4. This service is similar to paying a tutor to help improve your skills. Simple Condensation Reaction Report release.

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