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:
Dec. 13, 1988
Filed:
Feb. 08, 1988
Applicant:
Inventors:
Clarence D Chang, Princeton, NJ (US);
Nai Y Chen, Titusville, NJ (US);
Stuart D Hellring, Trenton, NJ (US);
Ying-Yen P Tsao, Lahaska, PA (US);
Dennis E Walsh, Richboro, PA (US);
Assignee:
Mobile Oil Corporation, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
C10G / ; C10G / ; C07C / ;
U.S. Cl.
CPC ...
208111 ; 208120 ; 208124 ; 585739 ;
Abstract
The acidity of a zeolite catalyst is reduced by calcination in an essentially water-free atmosphere at temperatures above 700.degree. C., preferably from 725.degree. to 800.degree. C., to reduce the alpha value to less than about 10 percent of its original value. The low acidity catalysts produced in this way may be used for conversions requiring low acidity, shape selective catalysis, including dewaxing. The calcined, low acidity catalysts exhibit improved dewaxing activity.