Shell Internationale Research Maatschappij B.V. Consejo Superior Investigaciones Cientificas, J. CATALYSIS, vol. 2012799418, Ref document number: The process of claim 3 or claim 4, wherein the benzene by-product is dried before passage through the bed of adsorbent. Nos. Ethylbenzene is an intermediate in organic synthesis, especially in the production of styrene and synthetic rubber. 7. Published Patent Application No. The B/T fraction may also be recovered from an ethylbenzene-and-lighter fraction distilled from crude styrene in a preceding distillation column. [0009] According to the present invention, it has now been found that, by passage of at least the benzene by-product of a styrene plant through a dedicated adsorbent bed comprising at least one of acidic clay, alumina, an acidic ion exchange resin and an acidic molecular sieve, poisons, such as basic nitrogen compounds, can be effectively removed from the benzene by-product. It’s generally made by using AlCl3 (with HF) or zeolites to convert benzene and ethylene to ethylbenzene, followed by dehydrogenation to styrene. The entire contents of all the above patent specifications are incorporated herein by reference. http://pubs.acs.org/page/copyright/permissions.html. Ref document number: Get article recommendations from ACS based on references in your Mendeley library. The process of claim 9, wherein the purified benzene by-product produced in (d) contains less than 50 ppb of basic nitrogen compounds. No. [0034] The invention will now be more particularly described with reference to the Examples and the accompanying drawing. Journal of Cleaner Production, 71, 98–109. 5,236,575), MCM-56 (described in U.S. Patent No. Nos. The process of any preceding claim, wherein the alkylating (a) is conducted under conditions such that at least part of the benzene is in the liquid phase. [0004] Acidity due to carbon dioxide dissolved in the aqueous phase of the crude styrene effluent can cause corrosion in downstream equipment and can hinder the separation of the organic and aqueous phases. The process of claim 11, wherein the zeolite is selected from the group consisting of MCM-22, PSH-3, SSZ-25, ERB-1, ITQ-1, ITQ-2, MCM-36, MCM-49, MCM-56 and UZM- 8. and a molar ratio of benzene to polyalkylated aromatic compound(s) of from 1:1 to 30:1, preferably, 1: 1 to 10:1, more preferably, 1:1 to 5:1. [0031] After recovery of the crude styrene, the benzene/toluene ("B/T") fraction is separated from the unreacted ethylbenzene and heavier aromatics in the dehydrogenation effluent by distillation. No. 4,556,477. 8. Electronic Supporting Information files are available without a subscription to ACS Web Editions. [0022] The molecular sieves described above may be used in the alkylation catalyst in unbound form but generally will be combined with a binder material resistant to the temperature and other conditions employed in the process. (e) recycling the purified benzene by-product to the alkylating (a) and/or the transalkylating (b). A separate water phase forms in the overhead condensing equipment and, although most of the amine injected will partition with the water phase, some will be present in the B/T byproduct. type X or Y, Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the mordenite type, Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. 10. Typically, the molecular sieve employed in the alkylation catalyst is selected from the group consisting of ZSM-3, ZSM-4, ZSM-5, ZSM-11, ZSM-12, ZSM-14, ZSM-18, ZSM-20, ZSM-22, ZSM-23, ZSM-35, ZSM-48, zeolite beta, zeolite Y, Ultrastable Y (USY), Dealuminized Y (Deal Y), mordenite, MCM-22, PSH-3, SSZ-25, ERB-1, ITQ-1, ITQ-2, MCM-36, MCM-49, MCM-56, and UZM-8. EP, Kind code of ref document: Zeolite UHP-Y is described in U.S. Pat. A brief description of the process is as follows. purification or separation of hydrocarbons with the aid of solids, e.g. The process of any preceding claim, wherein the benzene by-product produced in (c) contains in excess of 2 ppm of basic nitrogen compounds. VI, 1966, pages 278 - 287, The method that polar compound is removed from the aromatic raw material containing polar compound, Zeolite z-14us and method of preparation thereof, Method for preparing highly siliceous zeolite-type materials and materials resulting therefrom, Preparation of rare earth metal exchanged crystalline alumino silicates, Crystalline zeolite zsm-5 and method of preparing the same, Treatment of organic cationcontaining zeolites, Aromatization of hetero-atom substituted hydrocarbons, Crystalline zeolite ZSM-20 and method of preparing same, Process for production and dehydrogenation of ethylbenzene, Crystalline zeolite and method of preparing same, Alkylation in presence of thermally modified crystalline aluminosilicate catalyst, Crystalline zeolite ZSM-23 and synthesis thereof, Crystalline silicates and catalytic conversion of organic compounds therewith, Crystalline aluminosilicate PSH-3 and its process of preparation, Highly siliceous porous crystalline material ZSM-22 and its use in catalytic dewaxing of petroleum stocks, Synthetic, crystalline, porous material containing oxides of silicon and boron, Composition of synthetic porous crystalline material, its synthesis and use, Synthetic porous crystalline mcm-49, its synthesis and use, Synthetic layered MCM-56, its synthesis and use, Oxide materials and catalyst compositions containing them, Hydrocarbon conversion process using a zeolite bound zeolite catalyst, Alkylation/transalkylation process with pretreatment of the alkylation/transalkylation feedstock, Crystalline aluminosilicate zeolitic composition: UZM-8, Styrene process with recycle from dehydrogenation zone, Integrated process for the production of vinyl aromatic hydrocarbons, Treatment of Alkylation Catalyst Poisons with Dehydrogenation, Selective hydrogenation of unsaturated aliphatic hydrocarbons in predominantly aromatic streams, Process and apparatus for the removal of nitrogen compounds from a fluid stream, Methods for removing weakly basic nitrogen compounds from a hydrocarbon stream using acidic clay, Phenol removal in paraxylene recovery process, Heavy aromatics processing catalyst and process of using the same, Method for removing polar contaminants from aromatic feedstocks, Production of high purity ethylbenzene from non-extracted feed, Improved liquid phase alkylation procedure, Process for preparing ethylbenzene using liquid phase alkylation and vapor phase transalkylation, Alkylaromatics production using dilute alkene, Process for the production of alkylaromatics, Combined reactor effluent and regenerant recirculation for detergent alkylation process, Recovery of olefins from para-xylene process, Liquid phase alkylation with multiple catalysts, Method for purifying supply flows containing aromatics by means of zeolites, Aromatic alkylation process with direct recycle, Ep: the epo has been informed by wipo that ep was designated in this application, Wipo information: entry into national phase. doi:10.1016/j.compchemeng.2012.11.007, 5. In another embodiment, the benzene by-product is dried before passage through the bed of adsorbent.

[0001] This invention relates to a process for the production of styrene. [0011] In a further aspect, the invention resides in a process for producing styrene, the process comprising: (a) alkylating benzene with ethylene to produce ethylbenzene and polyethylated benzenes; (b) transalkylating at least some of the polyethylated benzenes from (a) with benzene to produce additional ethylbenzene; (c) dehydrogenating at least some of the ethylbenzene from (a) and (b) to produce styrene, together with benzene and toluene as by-products; (d) passing at least part of the benzene by-product from (c) through a bed of an adsorbent comprising at least one of an acidic clay, alumina, an acidic ion exchange resin and an acidic molecular sieve to remove basic nitrogenous impurities therefrom and produce a purified benzene by-product; and.



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