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:
Feb. 28, 1995
Filed:
Apr. 30, 1992
James N Ziemer, Hercules, CA (US);
John M Rosenbaum, Richmond, CA (US);
Kristine L Eiden, Larkspur, CA (US);
Chevron Research and Technology Company, San Francisco, CA (US);
Abstract
A process is disclosed for producing a hydrogenated lubricating oil base stock having improved stability. A lube oil base stock is contacted with hydrogen in a first hydrogenation zone under hydrogenation reaction conditions in the presence of a macroporous hydrogenation catalyst comprised of a particulate refractory inorganic oxide support component and a hydrogenation component. The macroporous hydrogenation catalyst has an acid site density of between about 0.015 and about 0.3 milliequivalents per gram of catalyst, a total pore volume greater than about 0.45 cm.sup.3 /g, and at least 10% of the total pore volume in macropores of diameter is greater than about 1000 Angstroms. A portion of the effluent from the first step is then contacted with hydrogen in a second hydrogenation zone under hydrogenation reaction conditions in the presence of a mesoporous hydrogenation catalyst comprised of a particulate refractory inorganic oxide support component and a hydrogenation component. The catalyst has an acid side density of between about 0.015 and about 0.3 milliequivalents per gram of catalyst, a total pore volume greater than about 0.30 cm.sup.3 /g, and has less that 10% of the total pore volume in macropores of diameter greater than about 1000 Angstroms. A lube oil base stock is then recovered which has improved stability.