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:
Jul. 23, 1991
Filed:
Aug. 18, 1989
Applicant:
Inventors:
Pochen Chu, West Deptford, NJ (US);
Francis G Dwyer, West Chester, PA (US);
Albert B Schwartz, Philadelphia, PA (US);
Assignee:
Mobil Oil Corporation, Fairfax, VA (US);
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; B01J / ;
U.S. Cl.
CPC ...
502 60 ; 502 66 ; 502 71 ;
Abstract
There are provided aromatic conversion reactions for preparation of dialkylbenzenes, such as xylene and ethyltoluene, of enhanced para isomer content with a zeolitic catalyst composition of improved shape selectivity. The catalysts comprise certain zeolites which have been calcined at a high temperature of at least 649.degree. C. (i.e., 1200.degree. F.). These zeolites have a silica/alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12. Examples of such zeolites include ZSM-5 and ZSM-11.