Modeling and simulation of styrene monomer reactor. A set of intrinsic rate equations based on the hougenwatson formalism was derived for the dehydrogenation of ethylbenzene into styrene on a commercial potassiumpromoted iron catalyst. Plant design for production of styrene 2016 executive summary styrene who is also known as ethylbenzene,vinybenzene and phenylethene is an organic compound with the chemical formula c6h5chch2. Design and control of the styrene process industrial. Proprietary process technology ethylbenzene with pbe. Design and analysis of an ethyl benzene production process. Pdf catalytic dehydrogenation of ethylbenzene to styrene. A membrane reactor for the production of sytrene from. The one resulting in the lowest eaoc should be identified. Ethylbenzene is used primarily in the production of styrene. Jul 22, 2015 reactor two will convert 33% of the incoming unreacted ethylbenzene into styrene, producing a final styrene product of 286. Dec 04, 2015 in overall, the video describing about the ethylene benzene processproduction. This research intends to know the mass composition of the different streams involved in the production process, so it is possible to determine the main design param. As the final part of the feasibility study, we would like you to study the details of the reactor and separation section of proposed plant and then optimize the complete process.
Both adiabatic and steaminjected reactors are considered. However, ethylene can also react with eb to form an undesired product of diethyl benzene deb if reactor temperatures or ethylene concentrations are high. The two objectives are maximization of styrene production and styrene selectivity. Technology is reliable and proven at industrial scale with an ethylbenzene grass root plant of 650 kta. Complete separation system is designed using cdcs or dwc. Design and control of the ethyl benzene process luyben 2011. Design and control of the ethyl benzene process luyben.
Eb, phenylethane is a colorless liquid, insoluble in water and miscible with most organic solvents. Major portion of saturated steam is superheated to about k in a furnace. In the aspen model, the plant base case is designed to produce 1,150 million lbyr 522,000 tyr of eb from benzene and ethylene. Both the ethylbenzene and the steam will need to be heated to 600c in separate streams and then blended right before the reactor. Ethylene reacts with ethylbenzene to form undesired product diethyl benzene, if the temperatures of reactor or concentrations of ethylene are high. Journal of membrane science, 85 1993 229239 elsevier science publishers b. Ethylbenzene eb is an important intermediate for the production of styrene. Production of ethylbenzene by victoria yun on prezi.
You have been asked to design a packed bed reactor for the production of styrene by catalytic dehydrogenation of ethylbenzene. In 2012, more than 99% of ethylbenzene produced was. To supply the high energy load consumed by the highly endothermic reaction of dehydrogenation, a great quantity of steam is used in the reactor feed. Oct 14, 2010 the main design optimization variables in this process are the steamtoeb ratio, reactor inlet temperature, eb recycle flow rate and reactor size. Separation processes and reaction engineering design project. Ethylbenzene production has a smaller demand for the ethylene stream than the.
Ethylbenzene market trends, developments and prospects. Box 800, riyadh 11421 saudi arabia b chemical reaction engineering group creg, chemical engineering department. As the final part of the feasibility study, we would like you to study the. Experimental data were obtained for a range of temperatures, space. In a typical styrene production operation, ethylbenzene is mixed with saturated steam and preheated by heat exchange with the reactor effluent. Styrene benzene polystyrene free 30day trial scribd. Ethylbenzene market in world styrene production is the largest application accounting for 99% of global eb demand. A small fraction of the aromatic stream, together with the recycled peb from the eb recovery section, is diverted to feed transalkylation reactor r102. Separation processes and reaction engineering design. The ethylbenzene feed is available from another part of the plant at 210 kpa and 6c. Benzene emissions from ethylbenzene eis styrene industry. Conventionally, the production of eb is based on the alkylation of c 6 h 6 with pure c 2 h 4. Separations and reaction engineering design project styrene. Ethylbenzene and styrene are also subjected to side reactions which is expected to consume 12.
This capacity is sufficient to supply feedstock for the production of 1,000 to 1,075 million lbyr 454,000 to 488,000 tyr of styrene. Experimental data were obtained for different operating. A method of producing an alkylaromatic by the alkylation of an aromatic with an alkylating agent, such as producing ethylbenzene by an alkylation reaction of benzene, is disclosed. Design project styrene production your assignment is to continue evaluating the details of a process to produce 100,000 tonney of styrene from ethylbenzene in an 8200hour year. Proprietary process technology ethylbenzene with pbe12. Ethylbenzene technology versalis is in the position to offer an uptodate and flexible ethylbenzene production technology, based on the proprietary zeolitebased catalysts pbe1 for alkylation and pbe2 for transalkylation stages.
Increase in risk to crack of the reactor and preheater due to high temperature operation 4. The author a noted expert on the topic explores the use of transfer functions to study residence time. Ethylbenzene ethylbenzene eb phenylethane ethylbenzene a. By the end of 1982, based on a projected six percent annual growth in both styrene production and ethylbenzene consumption, styrene production levels should nearly equal capacity and ethylbenzene production should be 90 percent of capacity. However, ethylene can also react with eb to form an undesired product of di. Ethylbenzene dehydrogenation reactor model industrial.
Plant design for the separation of various components from turpentine oil. Most of the aromatic stream is combined with ethylene to feed alkylation reactor r101. Hr 0 based on lechatliers principle, this reaction is favored by high temperature, low pressure, and low overall concentration. The hbeta catalyst used in a preliminary alkylation reactor can reduce the deactivation of the catalyst in the primary alkylation reactor. Hr 0 based on lechatliers principle, this reaction is favored by. The method includes using an hbeta catalyst to minimize process upsets due to alkylation catalyst deactivation and the resulting catalyst regeneration or replacement. Enable production of equipment that converts wind and sunlight into energy, storage tanks that do not allow gasoline or other fluids to leak, recreational fiberglass boats, and many other products.
An unusual feature of the eb process is the ability to recycle to extinction all the deb formed in the reactor no net deb product produced, since deb reacts with benzene to form eb. Low equilibrium conversion of ethylbenzene to styrene due to limitation of thermodynamic equilibrium 3. A combination of tubular heat exchanger type reactor and an adiabatically operated stage is often employed to increase the capacity of production with enhanced yields. This process involves the reaction of benzene with ethylene to form ethylbenzene. Table 2 provides the list of important blocks, design bases and assumptions for the process.
The third and last reactor utilizes a recycled diethyl benzene stream for transalkylation, into ethylbenzene, which is fed into the outlet of the first reactor. The typical byproducts of the eb dehydrogenation are 1% benzene and 2% toluene formed by catalytic dealkylation and hydrodealkylation of eb 1 reaction network products and byproduct in the dehydrogenation of ethylbenzene. In overall, the video describing about the ethylene benzene processproduction. Box 800, riyadh 11421 saudi arabia b chemical reaction engineering group creg, chemical engineering department, king saud. Process description alkylation reactor benzene distillation. The styrene yield can be increased by using a hybrid process, with reaction and separation simultaneously.
This monocyclic aromatic hydrocarbon is important in the petrochemical industry as an intermediate in the production of styrene, the precursor to polystyrene, a common plastic material. Separation processes and reaction engineering design project production of ethylbenzene we continue to investigate the feasibility of constructing a new, grassroots, 80,000 tonney, ethylbenzene eb facility 99. Evaluation of the parameters and conditions of process in. A guide to the technical and calculation problems of chemical reactor analysis, scaleup, catalytic and biochemical reactor design chemical reactor design offers a guide to the myriad aspects of reactor design including the use of numerical methods for solving engineering problems. Feb 16, 2010 this is a 3d simulation of a petrochemical plant that produced ethylbenzene by a liquid phase alkylation of benzene and ethylene using zeolite catalyst. Material balance free download as powerpoint presentation. The work deals with optimization of the process of production of ethylbenzene by liquidphase benzene alkylation. This is a 3d simulation of a petrochemical plant that produced ethylbenzene by a liquid phase alkylation of benzene and ethylene using zeolite catalyst. In this process that depends on reversible reactions, the yield is usually limited by the establishment of thermodynamic equilibrium in the reactor.
The technology can be applied in the design of grass roots units, upgrading of existing. Ethylbenzene is available at 25c and 1 atm pressure. In styrene monomer reactor fresh ethyl benzene mixed with recycled ethyl benzene and steam is preheated using the product stream from the reactor, and then mixed with the superheated steam to reactor inlet temperature of over 875 k before injecting into the fixed bed catalytic reactor 10. An ethylbenzene dehydrogenation reactor design having an elongated outer shell 11, an elongated displacement member 12,112,212,312,412,512 located coaxially therein, and an annular catalyst bed 19 therebetween. Options include an adiabatic, packed bed reactor a series of these with interstage cooling, if needed, an isothermal, packed bed reactor, and a. The ethylbenzene process licensed by badger is a high yield, energy efficient, low environmental impact process that is easy to operate and maintainallowing for very low production cost. Aug 07, 1996 an ethylbenzene dehydrogenation reactor design having an elongated outer shell 11, an elongated displacement member 12,112,212,312,412,512 located coaxially therein, and an annular catalyst bed reactor and process for dehydrogenation of ethylbenzene to styrene fina technology. Froment a fundamental kinetic model based upon the hougenwatson formalism was. Apr 12, 2017 ethylbenzene market in world styrene production is the largest application accounting for 99% of global eb demand. It was shown that increase in styrene production over that of the industrial conventional fixedbed unit is achievable, if design, operating parameters, and catalysts are properly chosen 810. Most of it is produced by the catalytic dehydrogenation of ethylbenzene. Errata for era450379035a background information for proposed standards benzene emissions from ethy. The reactor is an adiabatic fixed bed reactor and operates at 65 wt% ethylbenzene.
Catalyst deactivation with evaporation of potassium suggestion for conventional process. Your final design should be an optimized process and should include all unit. The design is intended to resemble the new liquidphase eb process offered by lummus crest, which uses a zeolite catalyst developed by unocal. This approach is used as the base case design that is further investigated for process improvements with respect to both economic and environmental feasibility. It may be possible to design a production plant on base of laboratory scale. Material requirement to produce 1 billion lb of styrene per year reaction. Ethylbenzene is an organic compound with the formula c 6 h 5 ch 2 ch 3. Reactor two will convert 33% of the incoming unreacted ethylbenzene into styrene, producing a final styrene product of 286. Kinetic experiments were carried out using a commercial potassiumpromoted iron catalyst in a tubular reactor under atmospheric pressure.
In the liquidphase process the alkylation reactor operates at higher pressure but lower temperature than the vaporphase alkylation process. Elnashaieb, apetroleum engineering department, king saud university, p. Reactor and process for dehydrogenation of ethylbenzene to. Low reactor temperatures suppress side reactions but require higher eb recycle to achieve the same styrene production rate, which increases separation costs. It is also used as a solvent, as a constituent of asphalt and naphtha, and in fuels. Their study concentrated on a comparison of three plantwide control methodologies.
A great variety of catalysts have been investigated for the production of c 2 h 4 by the oxidative dehydrogenation of ethane ode in the last decade 2,3. An improved process for the production of styrene through dehydrogenation of ethylbenzene in the presence of steam at elevated temperatures, comprising 1 recovering heat of condensation normally lost during separation of the various components of the dehydrogenation reaction effluent, especially of ethylbenzene from styrene, without need or use of a compressor and 2 using. It is made by both liquid phase processes under moderate conditions employing aluminum chloride catalysis and by vapor phase processes at 150250 c and 3050 atm in the presence of a supported boron trifluoride catalyst eq. Alkylation reactor design is evaluated rigorously for its kinetics and configuration. Styrene is an important monomer in the manufacture of thermoplastic. The entire miniplant consists only of the reactor and one. Simulation of the styrene production process via catalytic. It is a highly flammable, colorless liquid with an odor similar to that of gasoline. Pdf catalytic dehydrogenation of ethylbenzene to styrene in. Reactor design che 325 several reactor types may be considered for use in this design and should be optimized separately. China and usa each consumes the same amount of eb as all western european countries do shares are approximately %. It is mainly used to produce styrene, used extensively in the production of important polymers and resins. International journal of chemical reactor engineering.
Styrene production from ethylbenzene the following text in this section is taken from 2 shortened and is permitted for personal use only. The economic optimum design of the process was given, but no quantitative details were given of how the optimum. Dehydrogenation process for production of styrene from. Us20080293983a1 process for producing ethylbenzene. Styrene production from ethylbenzene michigan foam. Separations and reaction engineering design project. The reactor is an adiabatic fixed bed reactor and operates at 65 wt% ethylbenzene conversion. The elaboration was based in the book of petroleum. Although styrene was discovered way back in 1839, its commercial production and applications were developed in the 1930s. Badger ethylbenzene technology is used to produce ethylbenzene from benzene and either polymergrade ethylene or an ethyleneethane feedstock using the ebmax.
Material balance scribd read books, audiobooks, and more. In this study, the catalytic dehydrogenation of ethylbenzene eb to styrene production was investigated in a tubular pdag membrane reactor mr in presence of a commercial iron oxide catalyst. A novel reverse flow strategy for ethylbenzene dehydrogenation in a packedbed reactor. This is the amount of styrene in the product stream, not the total mass of the product stream. This ethylbenzene process involves contacting, in an alkylation zone, a first benzene recycle stream and an ethylene feed stream with an alkylation catalyst to form ethylbenzene. The ethyl benzene eb process involves the reaction of benzene with ethylene to form the desired eb product. Abstract the ethyl benzene eb process involves the reaction of.
Transalkylation reactor a g deb column a a g process flow diagram ethylbenzene column g benzene. Ethylbenzene production has a smaller demand for the ethylene stream than the products already described and currently stands 19th in volume of production. The model discrimination and parameter estimation was based on an extensive set of experiments that were conducted in a tubular reactor. Today the progress of chemical engineering enables large scaleup factors. A twostage reactor with steam reheat, design bases and assumptions capacity 1 billion lbyr 454,000 tyr, styrene at 0. In 1978, production was approximately 70 percent of total capacity. Typical reaction conditions were temperature 620oc, steam to ethylbenzene mole ratio 11, and partial pressure of n2 diluent 0. This video were based on slide to interface person discussion. Simulation of the styrene production process via catalytic dehydrogenation of ethylbenzene using. You have been asked to design a packed bed reactor.