Conventionally, the production of eb is based on the alkylation of c 6 h 6 with pure c 2 h 4. 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. Your final design should be an optimized process and should include all unit. 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. In overall, the video describing about the ethylene benzene processproduction. Pdf catalytic dehydrogenation of ethylbenzene to styrene in. Box 800, riyadh 11421 saudi arabia b chemical reaction engineering group creg, chemical engineering department. Separations and reaction engineering design project styrene. A novel reverse flow strategy for ethylbenzene dehydrogenation in a packedbed reactor. 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. The entire miniplant consists only of the reactor and one.
Ethylbenzene is an organic compound with the formula c 6 h 5 ch 2 ch 3. The hbeta catalyst used in a preliminary alkylation reactor can reduce the deactivation of the catalyst in the primary alkylation reactor. 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. Ethylbenzene dehydrogenation reactor model industrial. Styrene is an important monomer in the manufacture of thermoplastic. This is the amount of styrene in the product stream, not the total mass of the product stream. However, ethylene can also react with eb to form an undesired product of diethyl benzene deb if reactor temperatures or ethylene concentrations are high. Proprietary process technology ethylbenzene with pbe. 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. You have been asked to design a packed bed reactor for the production of styrene by catalytic dehydrogenation of ethylbenzene. In 1978, production was approximately 70 percent of total capacity. The one resulting in the lowest eaoc should be identified. Separation processes and reaction engineering design. Table 2 provides the list of important blocks, design bases and assumptions for the process.
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. 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. 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. 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. Ethylbenzene is used primarily in the production of styrene. Ethylbenzene production has a smaller demand for the ethylene stream than the products already described and currently stands 19th in volume of production. 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. Complete separation system is designed using cdcs or dwc. 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. Eb, phenylethane is a colorless liquid, insoluble in water and miscible with most organic solvents. Material requirement to produce 1 billion lb of styrene per year reaction. Box 800, riyadh 11421 saudi arabia b chemical reaction engineering group creg, chemical engineering department, king saud. This approach is used as the base case design that is further investigated for process improvements with respect to both economic and environmental feasibility. Hr 0 based on lechatliers principle, this reaction is favored by.
Most of the aromatic stream is combined with ethylene to feed alkylation reactor r101. Experimental data were obtained for a range of temperatures, space. Errata for era450379035a background information for proposed standards benzene emissions from ethy. Journal of membrane science, 85 1993 229239 elsevier science publishers b. Hr 0 based on lechatliers principle, this reaction is favored by high temperature, low pressure, and low overall concentration. Although styrene was discovered way back in 1839, its commercial production and applications were developed in the 1930s. 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. In the liquidphase process the alkylation reactor operates at higher pressure but lower temperature than the vaporphase alkylation process. 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. Increase in risk to crack of the reactor and preheater due to high temperature operation 4. The styrene yield can be increased by using a hybrid process, with reaction and separation simultaneously. Simulation of the styrene production process via catalytic. Low reactor temperatures suppress side reactions but require higher eb recycle to achieve the same styrene production rate, which increases separation costs. However, ethylene can also react with eb to form an undesired product of di.
Dec 04, 2015 in overall, the video describing about the ethylene benzene processproduction. Both the ethylbenzene and the steam will need to be heated to 600c in separate streams and then blended right before the reactor. The reactor is an adiabatic fixed bed reactor and operates at 65 wt% ethylbenzene conversion. Design and analysis of an ethyl benzene production process. Ethylbenzene ethylbenzene eb phenylethane ethylbenzene a. This video were based on slide to interface person discussion. Design and control of the ethyl benzene process luyben. The technology can be applied in the design of grass roots units, upgrading of existing. The design is intended to resemble the new liquidphase eb process offered by lummus crest, which uses a zeolite catalyst developed by unocal. Modeling and simulation of styrene monomer reactor.
Experimental data were obtained for different operating. Low equilibrium conversion of ethylbenzene to styrene due to limitation of thermodynamic equilibrium 3. Alkylation reactor design is evaluated rigorously for its kinetics and configuration. Ethylbenzene production has a smaller demand for the ethylene stream than the. International journal of chemical reactor engineering. The composition is 95 mol% ethylbenzene, 3 mol% toluene, and 2 mol% benzene. Ethylbenzene eb is an important intermediate for the production of styrene. Ethylene reacts with ethylbenzene to form undesired product diethyl benzene, if the temperatures of reactor or concentrations of ethylene are high. Styrene production from ethylbenzene michigan foam. Both adiabatic and steaminjected reactors are considered. The method includes using an hbeta catalyst to minimize process upsets due to alkylation catalyst deactivation and the resulting catalyst regeneration or replacement. 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. The economic optimum design of the process was given, but no quantitative details were given of how the optimum.
The author a noted expert on the topic explores the use of transfer functions to study residence time. Technology is reliable and proven at industrial scale with an ethylbenzene grass root plant of 650 kta. Abstract the ethyl benzene eb process involves the reaction of. The model discrimination and parameter estimation was based on an extensive set of experiments that were conducted in a tubular reactor. As the final part of the feasibility study, we would like you to study the. The conversion of 50 to 60% is obtained in technical reactor. 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. 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. Evaluation of the parameters and conditions of process in. Jul 22, 2015 reactor two will convert 33% of the incoming unreacted ethylbenzene into styrene, producing a final styrene product of 286.
Design and control of the styrene process industrial. Ethylbenzene is available at 25c and 1 atm pressure. Apr 12, 2017 ethylbenzene market in world styrene production is the largest application accounting for 99% of global eb demand. Badger ethylbenzene technology is used to produce ethylbenzene from benzene and either polymergrade ethylene or an ethyleneethane feedstock using the ebmax. 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. The ethyl benzene eb process involves the reaction of benzene with ethylene to form the desired eb product. The work deals with optimization of the process of production of ethylbenzene by liquidphase benzene alkylation.
In 2012, more than 99% of ethylbenzene produced was. This process involves the reaction of benzene with ethylene to form ethylbenzene. Kinetic experiments were carried out using a commercial potassiumpromoted iron catalyst in a tubular reactor under atmospheric pressure. Reactor design che 325 several reactor types may be considered for use in this design and should be optimized separately.
Major portion of saturated steam is superheated to about k in a furnace. Elnashaieb, apetroleum engineering department, king saud university, p. 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. Pdf optimization of styrene reactor design for two objectives. The two objectives are maximization of styrene production and styrene selectivity. Their study concentrated on a comparison of three plantwide control methodologies. The elaboration was based in the book of petroleum. 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. 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. 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. You have been asked to design a packed bed reactor. It is mainly used to produce styrene, used extensively in the production of important polymers and resins.
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 this process that depends on reversible reactions, the yield is usually limited by the establishment of thermodynamic equilibrium in the reactor. Ethylbenzene and styrene are also subjected to side reactions which is expected to consume 12. 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. 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.
Ethylbenzene market in world styrene production is the largest application accounting for 99% of global eb demand. Us20080293983a1 process for producing ethylbenzene. Today the progress of chemical engineering enables large scaleup factors. The ethylbenzene feed is available from another part of the plant at 210 kpa and 6c.
Pdf catalytic dehydrogenation of ethylbenzene to styrene. 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. Separations and reaction engineering design project. It is also used as a solvent, as a constituent of asphalt and naphtha, and in fuels. The reactor is an adiabatic fixed bed reactor and operates at 65 wt% ethylbenzene. A twostage reactor with steam reheat, design bases and assumptions capacity 1 billion lbyr 454,000 tyr, styrene at 0. Reactor two will convert 33% of the incoming unreacted ethylbenzene into styrene, producing a final styrene product of 286. 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. Options include an adiabatic, packed bed reactor a series of these with interstage cooling, if needed, an isothermal, packed bed reactor, and a. Catalyst deactivation with evaporation of potassium suggestion for conventional process.
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. Typical reaction conditions were temperature 620oc, steam to ethylbenzene mole ratio 11, and partial pressure of n2 diluent 0. Styrene benzene polystyrene free 30day trial scribd. It may be possible to design a production plant on base of laboratory scale. Material balance scribd read books, audiobooks, and more. Dehydrogenation process for production of styrene from. This is a 3d simulation of a petrochemical plant that produced ethylbenzene by a liquid phase alkylation of benzene and ethylene using zeolite catalyst. Benzene emissions from ethylbenzene eis styrene industry.
Simulation of the styrene production process via catalytic dehydrogenation of ethylbenzene using. Material balance free download as powerpoint presentation. Design and control of the ethyl benzene process luyben 2011. 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. 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. Transalkylation reactor a g deb column a a g process flow diagram ethylbenzene column g benzene. A small fraction of the aromatic stream, together with the recycled peb from the eb recovery section, is diverted to feed transalkylation reactor r102. Plant design for the separation of various components from turpentine oil.
It is a highly flammable, colorless liquid with an odor similar to that of gasoline. Us20080293983a1 us11752,516 us75251607a us2008293983a1 us 20080293983 a1 us20080293983 a1 us 20080293983a1 us 75251607 a us75251607 a us 75251607a us 2008293983 a1 us2008293983 a1 us 2008293983a1 authority us united states prior art keywords benzene fractionation column ethylbenzene stream prior art date 20070523 legal status the legal status is. Reactor and process for dehydrogenation of ethylbenzene to. Process description alkylation reactor benzene distillation. Most of it is produced by the catalytic dehydrogenation of ethylbenzene. China and usa each consumes the same amount of eb as all western european countries do shares are approximately %. Production of ethylbenzene by victoria yun on prezi. Ethylbenzene market trends, developments and prospects. Proprietary process technology ethylbenzene with pbe12. Styrene production from ethylbenzene the following text in this section is taken from 2 shortened and is permitted for personal use only.