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A new catalytic process for the synthesis of para-xylene through benzene methylation with CH3Br

Paper ID Volume ID Publish Year Pages File Format Full-Text
49570 46755 2014 5 PDF Available
Title
A new catalytic process for the synthesis of para-xylene through benzene methylation with CH3Br
Abstract

•A new process for p-xylene preparation by benzene alkylation with CH3Br is proposed.•Benzene conversion is up to 43.6% and p-xylene selectivity is 91.2% at 475 °C.•The process has advantages such as mild reaction conditions, simple operation.•The process has great industrial potential for p-xylene production.

A new process for the generation of para-xylene (p-xylene) through benzene alkylation with CH3Br has been proposed for the first time. CH3Br is prepared by the catalytic bromination of methane (the main component of natural gas), and benzene can be prepared from methane dehydroaromatization. Over the optimized P2O5–ZnO/HZSM-5 catalyst, benzene conversion is 43.6% and p-xylene selectivity is 91.2% at 475 °C, and the molar ratio of p-xylene in the liquid product is 28.7%. The relationship between the acidity and the catalytic efficiency of the modified H-ZSM-5 samples was investigated. It is found that isomerization of p-xylene occurs on the strong acid sites rather than on the weak acid sites, and benzene conversion is subject to the influence of strong acid sites.

Keywords
p-Xylene; Benzene; Bromomethane; HZSM-5; Natural gas
First Page Preview
A new catalytic process for the synthesis of para-xylene through benzene methylation with CH3Br
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 54, 5 September 2014, Pages 6–10
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis