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:
Aug. 20, 1991
Filed:
Mar. 13, 1990
James D Seamans, Reisterstown, MD (US);
James G Welch, Baltimore, MD (US);
Neal G Gasser, Mt. Airy, MD (US);
Charles T Adams, Houston, TX (US);
CRI Ventures, Inc., Baltimore, MD (US);
Abstract
An improved method of presulfiding a hydrotreating or hydrocracking catalyst which minimizes sulfur stripping upon start-up of a hydrotreating or hydrocracking reactor utilizing such a catalyst. The method comprises the steps of contacting a hydrotreating or hydrocracking catalyst with elemental sulfur at a temperature below the melting point of sulfur, thereby forming a sulfur-catalyst mixture, and heating the sulfur-catalyst mixture to a temperature above the melting point of sulfur. Preferably, the sulfur-catalyst mixture is first mixed with at least one member selected from the group consisting of high boiling oils and hydrocarbon solvents to form a prewet mixture prior to heating at a temperature above the melting point of sulfur. Tail gas treating catalysts are also presulfided by these methods.