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:
Apr. 30, 2013
Filed:
Oct. 06, 2009
Kamala R. Krishna, Danville, CA (US);
James N. Ziemer, Martinez, CA (US);
Andrew Rainis, Walnut Creek, CA (US);
Joseph A. Biscardi, New York, NY (US);
Thomas V. Harris, Benicia, CA (US);
Kamala R. Krishna, Danville, CA (US);
James N. Ziemer, Martinez, CA (US);
Andrew Rainis, Walnut Creek, CA (US);
Joseph A. Biscardi, New York, NY (US);
Thomas V. Harris, Benicia, CA (US);
Chevron U.S.A. Inc., San Ramon, CA (US);
Abstract
The invention provides for a process for dewaxing a waxy hydrocarbon feedstock to form a lubricant oil. The invention is also directed to a catalyst system comprising a hydrotreating catalyst upstream of a dewaxing catalyst, used in the dewaxing of a waxy hydrocarbon feedstock to form a lubricant oil. In particular, the invention is directed to a process and catalyst system designed to maintain yield of lubricant oil product. Specifically, the yield of lubricant oil does not decrease more than 2%, at a target pour point, over a dewaxing temperature range. The hydrotreating catalyst helps prevent aging of the dewaxing catalyst and maintains lubricant oil product yield at a target pour point over a wide temperature range. The hydrotreating catalyst comprises platinum, palladium, or combinations thereof on a low acidity inorganic oxide support where acidity is measured by a decalin conversion of less than 10% at 700° F.