Synthesis of Modified Catalyst for Liquid Phase Alkylation of Benzene with Ethylene
- PDF / 909,585 Bytes
- 7 Pages / 612 x 792 pts (letter) Page_size
- 34 Downloads / 169 Views
hesis of Modified Catalyst for Liquid Phase Alkylation of Benzene with Ethylene D. A. Shavaleeva, M. L. Pavlovb, R. A. Basimovab, A. A. Sadovnikovc, V. V. Sudind, E. M. Smirnovae, N. R. Demikhovae, Yu. V. Grigor’evf, A. L. Maksimovc, and E. R. Naranovc, * aOOO
SNHGroup, Salavat, Bashkortostan, 453261 Russia Gazpromneftekhim Salavat Scientific and Technical Center, Salavat, Bashkortostan, 453256 Russia c Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, 119991 Russia d Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, 119334 Russia e Gubkin Russian State University of Oil and Gas, Moscow, 119991 Russia f Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333 Russia *e-mail: [email protected] b
Received April 25, 2020; revised May 5, 2020; accepted May 12, 2020
Abstract—Highly efficient binder-free catalysts, based on zeolite Y, for the liquid-phase alkylation of benzene with ethylene have been synthesized. The catalysts have been modified by treating with aqueous solutions of hydrochloric and citric acids to remove extra-framework aluminum formed during the partial dealumination of zeolite Y. The synthesized catalysts have been tested in the alkylation of benzene with ethylene at a temperature of 200°C, a pressure of 2.5 MPa, a benzene : ethylene molar ratio of 5 : 1, and a benzene feed space velocity of 5 h−1. Over the modified catalyst, the ethylbenzene (EB) content in the alkylate increases by 27% and the EB selectivity increases by 5% compared to the initial Y zeolite. Keywords: catalyst synthesis, binder-free zeolite Y, alkylation, benzene, ethylene, ethylbenzene DOI: 10.1134/S0965544120090182
Currently, ethylbenzene (EB) production occupies one of the leading places among alkylation processes, since most of the resulting product is used in the production of styrene [1]. About 40% of EB is still produced by the outdated Friedel–Crafts alkylation process using aluminum chloride [2]. The use of this chemical creates serious environmental and operational problems (high corrosiveness and a significant amount of chemically contaminated wastewater). Therefore, in the last forty years, much attention has been paid to the production of EB using heterogeneous zeolite-containing catalysts [3–6]. Since 1990, thanks to advances in the field of heterogeneous catalysis, favorable conditions (including those due to the lobbying of environmental activists) have appeared for the creation of a process for producing alkylaromatic hydrocarbons (HCs) using a lowwaste technology that eliminates environmental pollution. Catalysts for the alkylation of aromatic hydrocarbons with ethylene should have a certain set of properties that would make it possible to obtain EB in high yields and with the least coke formation [7–9]. At present, the study of zeolite-containing components of solid acid catalysts is being actively pursued [10– 18]. Therefore, the development of heterogeneous catalysts and the creation of a continuous, waste-fre
Data Loading...
