The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2007
Filed:
Apr. 23, 2004
Ashim Kumar Ghosh, Houston, TX (US);
Gopalakrishnan Juttu, Sugar Land, TX (US);
Pamela Harvey, Missouri City, TX (US);
Neeta Kulkarni, Houston, TX (US);
Ashim Kumar Ghosh, Houston, TX (US);
Gopalakrishnan Juttu, Sugar Land, TX (US);
Pamela Harvey, Missouri City, TX (US);
Neeta Kulkarni, Houston, TX (US);
Saudi Basic Industries Corporation, Riyadh, SA;
Abstract
A method of modifying a zeolite catalyst to increase para-xylene selectivity of the zeolite catalyst in toluene methylation reactions is provided. The method includes forming a slurry of a ZSM-5-type zeolite and an aqueous solution of a phosphorus compound. Water is removed from the slurry to provide a non-steamed, phosphorus treated ZSM-5 zeolite catalyst without deposition of phosphorus onto the catalyst by organophosphorus vapor deposition. The resulting non-steamed, phosphorus treated ZSM-5 zeolite catalyst has a pore volume of from 0.2 ml/g or less and provides greater than 80% para-xylene selectivity of mixed xylenes when used in toluene methylation.