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. 02, 1983
Filed:
Oct. 08, 1981
Howard E Lebowitz, Mountain View, CA (US);
Norman C Stewart, San Jose, CA (US);
William H Weber, Helena, AL (US);
Electric Power Research Institute, Inc., Palo Alto, CA (US);
Abstract
A process for producing a superior coal liquefaction solvent. A particulate coal is admixed with a distillable aromatic hydrocarbon solvent and liquefied under predetermined conditions to form coal liquefaction products comprising distillable and substantially nondistillable soluble coal products and insoluble coal products. The distillable solvent and distillable soluble coal products are separated from the remaining liquefaction products. The remainder is admixed with a deashing solvent and separated under elevated temperature and pressure conditions in several separation zones into an insoluble coal products fraction, a light soluble coal products fraction and a heavy soluble coal products fraction. A portion of the light soluble coal products fraction is admixed with the recovered distillable solvent to form the coal liquefaction solvent. The light soluble coal products comprise at least about 15 percent and preferably 25 to 50 percent of the coal liquefaction solvent.