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. 30, 1983
Filed:
Sep. 15, 1982
Gerald B Faudel, Concorde, CA (US);
Tosco Corporation, Los Angeles, CA (US);
Abstract
Improved process and system for reducing the amounts of hydrogen sulfide emitted during pyrolysis of oil shale. At the elevated temperatures of oil shale pyrolysis, iron pyrite is converted to hydrogen sulfide which is emitted with the product gases and oils. Reduction in hydrogen sulfide emissions is accomplished by treating the oil shale with ultraviolet radiation of a particular wave length prior to pyrolysis in the presence of oxygen to selectively oxidize the pyritic sulfur to sulfate sulfur. The treated oil shale is then retorted at conventional temperatures. The sulfate sulfur does not decompose or otherwise convert to hydrogen sulfide at these temperatures. The sulfate sulfur remains in the spent shale residue and is discarded as waste to thereby effectively reduce the amount of sulfur emitted as hydrogen sulfide in the pyrolysis product gases.