dehydrogenation of ethylbenzene

The temperature of the catalyst and of the reaction mixture at the entry to the apparatus is 420° C., at the end of the tube bundle 620° C. and at the end of the subsequent reaction layer 585° C. © 2004-2020

Require these words, in this exact order. If you are the author of this article you do not need to formally request permission In practical use is the adiabatic process which is usually carried out in two radial-flow reactors which are connected in series, with intermediate heating or feeding in of steam, and which are operated adiabatically, and the isothermal process in which a tube bundle reactor with indirect heat transfer is used. If you are the author of this article you still need to obtain permission to reproduce A process for the dehydrogenation of ethylbenzene to styrene with input of heat by a heat-transfer medium on a dehydrogenation catalyst which is essentially located in a tube bundle, wherein the heat-transfer medium flows countercurrently to the reaction mixture in the region of the tube bundle, and, if required, another reaction chamber is located downstream of the tube bundle and is provided with a catalyst for adiabatic reaction.

The inner tube is … Industrial & Engineering Chemistry Research 1999, 38 (7), 2626-2633. H. W. G. HEYNEN and H. S. VAN DER BAAN. Fresh ethylbenzene is mixed with a recycle stream and vaporized. Fresh ethylbenzene is mixed with a recycle stream and vaporized. formally request permission using Copyright Clearance Center. The pressure at the end of the reactor is 0.5 bar absolute. Authors contributing to RSC publications (journal articles, books or book chapters) ► Formation of C–O bonding as the reaction intermediate on the catalyst.

Include any more information that will help us locate the issue and fix it faster for you. Coke Formation and Gasification in the Catalytic Dehydrogenation of Ethylbenzene. do not need to formally request permission to reproduce material contained in this The styrene yield can be increased by using a hybrid process, with reaction and separation … By continuing you agree to the use of cookies. Commercially available γ-Al 2 O 3 was calcined at temperatures between 500 and 1200 °C and tested for its performance in the oxidative ethylbenzene dehydrogenation (ODH) over a wide range of industrially-relevant conditions. The invention thus achieves a combination of all the advantages of the known processes: the high selectivity of the adiabatic process, and the low steam/ethylbenzene ratio due to indirect heat input in the isothermal process. DeepDyve's default query mode: search by keyword or DOI. Steam is additionally used in this case too. You can see your Bookmarks on your DeepDyve Library. Heeres, F. Kapteijn and M. Makkee, Delft University of Technology, Faculty of Applied Sciences, Chemical Engineering department, Julianalaan 136, 2628 BL Delft, The Netherlands, University of Groningen, Institute of Technology & Management, Chemical Engineering department, Nijenborg 4, 9747 AG Groningen, The Netherlands, Instructions for using Copyright Clearance Center page.

it in a third party non-RSC publication you must 4. Instituto de Química, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil, e The reactivity of the coke is changed due to the higher density and strength of the Lewis acid sites that are formed by the high temperature calcination. BASF Aktiengesellschaft (Ludwigshafen, DE), Click for automatic bibliography

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals. Go to our In 1938 Dow chemical began using the cracking of ethylbenzene with zinc oxide as the catalyst. This dehydrogenation process involves the catalytic reaction of ethylbenzene.

The catalytic activity of cobalt ferrite was compared with that of the traditional hematite based catalyst. Dehydrogenation of ethylbenzene to styrene: 65% of world production of styrene is polymerized to make polystyrene and other plastics. now abandoned. To get new article updates from a journal on your personalized homepage, please log in first, or sign up for a DeepDyve account if you don’t already have one. Reproduced material should be attributed as follows: If the material has been adapted instead of reproduced from the original RSC publication DE-A-34 43 118 also describes a combination of an upstream and a downstream reaction zone operated adiabatically with a tube bundle reactor.

Institut de recherches sur la catalyse et l'environnement, 2 Av.

Submitting a report will send us an email through our customer support system. do not need to formally request permission to reproduce material contained in this Select data courtesy of the U.S. National Library of Medicine. The catalytic activity of cobalt ferrite was compared with that of the traditional hematite based catalyst. Ikenaga et.

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However, there is a selectivity problem, as carbon oxides can be produced by deep oxidation of the hydrocarbons. This suggests that ethylbenzene was strongly adsorbed on the Fe3+ acid sites via π-bonding and the dehydrogenation was initiated by α-H+ abstraction from ethyl group on Mg2+–O2− basic sites, followed by C–O–Mg bond formation. The parameters were estimated from the minimization of the multiresponse objective function which was performed by means of the Marquardt algorithm. The following experimental arrangement is used for the process example described hereinafter (see FIG. the whole article in a third party publication with the exception of reproduction This article is part of the themed collection: For reproduction of material from all other RSC journals and books: For reproduction of material from all other RSC journals.

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