August 26, 2013

CAS databases provide millions of journal article references from more than 10,000 major scientific journals worldwide, patent and patent family references from 63 patent authorities around the world, and other reputable web sources.

The following patent record is from the CAplusSM database.


Patent Number: US 8471083
Title: Production of para-xylene by reforming using high-silica zeolite catalysts
Inventor(s): Chen, Cong-Yan; Miller, Stephen J.; Ziemer, James N.; Liang, Ann J.
Patent Assignee(s): Chevron U.S.A. Inc., USA
Source: U.S. Pat. Appl. Publ., 12pp.; Chemical Indexing Equivalent to 156:206164 (WO) CODEN: USXXCO
Language: English

A process for producing p-xylene comprises (a) providing a C8-feedstock contg. at least 10% of C8-paraffinic hydrocarbons to a reforming reaction zone that contains a reforming catalyst comprising a medium pore zeolite having a silica to alumina mole ratio of at least 200, and a crystallite size of < 10 µm, (b) contacting the C8-feedstock under reforming reaction conditions in the reforming reaction zone to produce p-xylene and m-xylene at a p-xylene/m-xylene ratio of at least 0.9, and (c) sepg. p-xylene from m-xylene.  The process produces p-xylene at greater than thermodn. equil. concns.

Please note:  Abstracts and Titles for patent records in CAplus are routinely enhanced to better describe the claimed invention.

 View the full-text here.

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