Production of Xylenes From Syngas

摘要

This disclosure relates to the production of xylenes from syngas, in which the syngas is converted to an aromatic product by reaction with an isosynthesis catalyst and an aromatization catalyst. The isosynthesis catalyst and aromatization catalyst may be different catalysts or combined into a single catalyst. The aromatic product is then subjected to one of more of (i) xylene isomerization, (ii) transalkylation with at least one C9+aromatic hydrocarbon, and (iii) alkylation with methanol and/or carbon monoxide and hydrogen to increase its p-xylene content.

主权项

1. A process for producing xylenes, the process comprising:
(a) providing a feed comprising hydrogen and carbon monoxide, in which the molar ratio of hydrogen to carbon monoxide is from 0.5 to 6; (b) contacting the feed with (i) a first catalyst comprising at least one metal or compound containing a metal selected from the group consisting of Ce, Zn, Zr, and Th, and (ii) a second catalyst, which may be the same as or different than the first catalyst, comprising at least one medium pore size molecular sieve under conditions including a temperature of at least 350° C. and a pressure of at least 1500 kPa (absolute) effective to produce a reaction effluent containing benzene, toluene, and xylenes; and (c) subjecting at least part of the reaction effluent to at least one of (i) contacting with a xylene isomerization catalyst, (ii) transalkylation with at least one C9+ aromatic hydrocarbon, and (iii) alkylation with methanol and/or carbon monoxide and hydrogen under conditions to produce p-xylene.