Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

A new catalytic process for high-efficiency synthesis of p-xylene by methylation of toluene with CH3Br

Language

English

Abstract

A new catalytic process for p-xylene synthesis from the methylation of toluene with CH3Br was proposed. CH3Br was prepared from the catalytic bromination of natural gas (CH4), by using H2O + HBr + O2 as mediator over supported Rh catalyst. The methylation conditions were investigated using HZSM-5 or modified HZSM-5 catalyst. Under optimal reaction conditions, p-xylene selectivity is up to 93%, and p-xylene yield is more than 21% at 673 k over the Si-P modified HZSM-5 catalyst. Compared to the processes using MeOH or dimethyl carbonate (DMC) as methylation agent, this new process is very attractive in an economic standpoint since CH4 is much cheaper than MeOH and DMC. In addition, the process has other advantages, such as mild reaction conditions, simple operation, high-product yield, and so on. It is predicted that the process has good industrial potential for para-xylene production. © 2012 American Institute of Chemical Engineers (AIChE).

Keywords

Bromomethane, HZSM-5, Methylation, P-Xylene, Toluene

Publication Date

2013

Source Publication Title

AIChE Journal

Volume

59

Issue

2

Start Page

532

End Page

540

Publisher

Wiley

DOI

10.1002/aic.13822

Link to Publisher's Edition

http://dx.doi.org/10.1002/aic.13822

ISSN (print)

00011541

ISSN (electronic)

15475905

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