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:
May. 07, 2013
Filed:
Jul. 11, 2011
Ashim Kumar Ghosh, Houston, TX (US);
Mohammad Shafiei, Sugar Land, TX (US);
Manuel Castelan, Houston, TX (US);
Pamela Harvey, Missouri City, TX (US);
Neeta Kulkarni, Houston, TX (US);
Ashim Kumar Ghosh, Houston, TX (US);
Mohammad Shafiei, Sugar Land, TX (US);
Manuel Castelan, Houston, TX (US);
Pamela Harvey, Missouri City, TX (US);
Neeta Kulkarni, Houston, TX (US);
Saudi Basic Industries Corporation, Riyadh, SA;
Abstract
This invention relates to a process for pretreating a zeolite catalyst, specifically a zeolite which has been modified with phosphorus. The catalyst may be used in a process for alkylation of aromatics, specifically toluene methylation. The pretreatment is first to contact the catalyst with the process reactants used in a process for alkylation of aromatics for at least two hours at conditions to produce an alkylated aromatic product and then with a gaseous stream containing oxygen at a temperature and for a time until there is no oxygen consumption. The zeolite may be a MFI zeolite. This pretreatment procedure for a phosphorus-modified zeolite catalyst produces a catalyst which has increased run time, i.e., decreased deactivation rate, compared to a fresh catalyst, even after successive regenerations.