First, a side-stream was added to the diisopropylbenzene (DIPB) distillation column in … A memory diffusion model for molecular anisotropic diffusion in siliceous β-zeolite,<933::AID-CEAT933>3.0.CO;2-9. We use cookies to help provide and enhance our service and tailor content and ads. h�bbd```b``�� ��D�6�H�U`{0� Therefore, a higher molar ratio of benzene to propylene is indispensable. This work deals with the improvement of the current process of alkylation of benzene (B) with propylene (P) to produce cumene (IPB). With the increase of reaction temperature, the decomposition rate of products increases. The facts. 180 6 Alkylation of Benzene by Propylene to Cumene reduction of particle size is restricted in practice for technological reasons, another alternative is the use of a surface - coated monolith catalyst. The traditional processes, which use solid phosphoric acid or AlCl 3 catalyst, suffer from corrosion and environmental problems. Alkylation of benzene with propylene in the presence of ticl4 and alkyl aluminum sesquichloride Download PDF Info Publication number US3129255A. 1062 0 obj <> endobj US3129255A US856349A US85634959A US3129255A US 3129255 A US3129255 A US 3129255A US 856349 A US856349 A US 856349A US 85634959 A US85634959 A US 85634959A US 3129255 A US3129255 A US 3129255A h�b```f`` A hydrogen on the ring is replaced by a group like methyl or ethyl and so on. Number of times cited according to CrossRef: Reaction mechanism of benzene alkylation with propylene catalyzed by HZSM-5 zeolite and H-Beta zeolite. Copyright © 2002 Elsevier Science B.V. All rights reserved. Due to high energy consumption brought by high feeding molar ratio of benzene to propylene (B/P), an optimized process design has been developed and is presented. The deactivation is caused from pore blockage of bulkier molecules formed by multi-alkylation instead of propylene oligomerization. The propylene feed was passed through a saturator containing benzene at … Reaktoren für Dreiphasen-Reaktionen: Rieselbettreaktoren. Time on stream behavior of the catalyst was quite steady without any sign of deactivation and the results were reproducible. %%EOF The alkylation of benzene with propylene over Hβ zeolite catalyst was studied by means of in situ FTIR and coke characterization. In addition, at higher temperature, propylene can more easily replace adsorbed benzene, so the reaction proceeds more quickly. Learn about our remote access options, Chemical Engineering Department, Faculty of Industrial Chemistry, Politehnica University of Bucharest, RO‐78126, Polizu 1, Bucharest, Romania. Mechanism of the alkylation of benzene with propylene in the presence of an aluminosilicate catalyst modified by reaction of aluminum chloride with aromatic hydrocarbons. 0 Use the link below to share a full-text version of this article with your friends and colleagues. The isopropylbenzene is an intermediate product to produce phenol and acetone. The full text of this article hosted at is unavailable due to technical difficulties. At higher temperature, however, bulkier molecules diffuse more quickly; this can prolong the lifetime of catalyst, so the reaction temperature could be too low. If you do not receive an email within 10 minutes, your email address may not be registered, Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, By continuing to browse this site, you agree to its use of cookies as described in our, I have read and accept the Wiley Online Library Terms and Conditions of Use. 1099 0 obj <>stream alkylation of benzene with propylene, taken from the 1997 National Student Design Competition of the AIChE. The alkylation of benzene with propylene to produce isopropylbenzene is an important reaction in petrochemical industry. The model could be instructive in exploratory simulations evaluating the conditions for benzene alkylation in liquid phase. The external mass transfer does not influence the cumene reaction. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Cumene is widely used to make acetone and phenol. The catalytic bed was a mixture of 100 mg zeolite and 100 mg inert material. After the catalyst has been impregnated with benzene, propylene can replace adsorbed benzene and react with benzene. Please check your email for instructions on resetting your password. The coke deposited on the catalyst is composed of multi-substituent aromatic compounds which have single or double rings. Traditional processes of alkylation of benzene with olefins are usually catalyzed by AlCl 3. %PDF-1.5 %���� However, high exother-micity raises problems with respect to temperature control. Benzene alkylation with propylene was carried out in the gas phase with a quartz fixed-bed differential reactor. Alkylation means substituting an alkyl group into something - in this case into a benzene ring. Benzene alkylation with propylene over a Ca modified HY zeolite to obtain cumene has been studied. Benzene is treated with a chloroalkane (for example, chloromethane or chloroethane) in the presence of … "���l9����"Ӆ�� R3H2.r��'�1012�l�g`�+����ŷ �Q I In the absence of excess benzene, adsorbed propylene will react with itself. and you may need to create a new Wiley Online Library account. For the process carried out in a fixed-bed bubble reactor where catalysts are impregnated in the bulk liquid of benzene, propylene oligomerization is suppressed. Alkylation of benzene with propylene is an industrially important reaction for the production of isopropylbenzene, an intermediate for the production of acetone and phenol. Benzene alkylation with propylene over a Ca modified HY zeolite to obtain cumene has been studied. 1078 0 obj <>/Filter/FlateDecode/ID[<7DBAEDDEFEB75044BE88D0FE6144FCF0>]/Index[1062 38]/Info 1061 0 R/Length 92/Prev 579404/Root 1063 0 R/Size 1100/Type/XRef/W[1 3 1]>>stream ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Study on the alkylation of benzene with propylene over Hβ zeolite. A simple power law kinetic model fits the experimental data significantly better than other models. A general time and space dependent model was developed to analyze the performance of a two‐phase downflow fixed bed reactor used for alkylation of benzene with zeolite catalyst. By continuing you agree to the use of cookies. The pore diffusion has a substantial influence on the cumene reaction only in the final region of the reactor, where the olefin concentration is very low.

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