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US 9,809,758 B2Granted
Production of xylenes from syngas
AssigneeExxonMobil Chemical Patents Inc.
InventorsJames H. Beech, Jr., Nikolaos Soultanidis, Steven E. Silverberg
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Abstract
This disclosure relates to the production of xylenes from syngas, in which the syngas is converted to an aromatic product by reaction with a Fischer-Tropsch catalyst and an aromatization catalyst. The Fischer-Tropsch catalyst and aromatization catalyst may be different catalysts or combined into a single catalyst. The aromatic product is then subjected to selective alkylation with methanol and/or carbon monoxide and hydrogen to increase its p-xylene content.
Claims13
A process for producing xylenes, the process comprising:
- (a) providing a first feed comprising hydrogen and carbon monoxide, in which the molar ratio of hydrogen to carbon monoxide is from about 0.5 to 6;
- (b) contacting the first feed with (i) a first catalyst comprising 1 to 50 wt % of Fe, and (ii) a second catalyst comprising at least one medium pore size molecular sieve, wherein contacting the first feed with the first catalyst and the second catalyst is carried out under conditions including a temperature from 200° C. to 370° C. and a pressure from 500 to 3000 kPa (absolute) effective to produce a reaction effluent containing benzene and/or toluene;
- and
- (c) reacting at least part of the benzene and/or toluene in the reaction effluent with a second feed comprising (i) methanol and/or (ii) hydrogen and carbon monoxide under conditions effective to produce p-xylene, wherein the reacting is conducted in the presence of a third catalyst comprising at least one molecular sieve having a Diffusion Parameter for 2,2-dimethylbutane of from 0.1 to 15 sec−1 when measured at a temperature of 120° C. and a 2,2-dimethylbutane pressure of 60 torr (8kPa),
- wherein the second catalyst is selectivated by contacting the second catalyst with steam at a temperature of at least 950° C. for about 10 minutes to 10 hours.
2 more elements
Dependencies are inferred from the claim text.