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:
May. 19, 1981
Filed:
Apr. 08, 1980
Leslie E Compton, Claremont, CA (US);
Occidental Research Corporation, Irvine, CA (US);
Abstract
A method is disclosed for reducing the nitrogen content of shale oil using mild hydrogenation followed by liquid sulfur dioxide extraction of the hydrogenated shale oil. The mild hydrogenation is effective for increasing the fraction of shale oil that is insoluble in the liquid sulfur dioxide. The mild hydrogenation is sufficient for saturating unsaturated compounds present in the shale oil to the substantial exclusion of adding hydrogen to the nitrogen of the nitrogen-containing compounds. Following hydrogenation of the shale oil, it is extracted with liquid sulfur dioxide at a temperature from about 14.degree. F. to about 60.degree. F. forming two fractions, a liquid sulfur dioxide insoluble fraction containing a relatively low nitrogen content and a liquid sulfur dioxide soluble fraction containing a relatively high nitrogen content. The liquid sulfur dioxide fraction is separated from the insoluble shale oil fraction. The liquid sulfur dioxide can be recovered for recycling to another extraction step.