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:
Jul. 31, 1979
Filed:
Mar. 20, 1978
Donald E Rhodes, Oklahoma City, OK (US);
Kerr-McGee Corporation, Oklahoma City, OK (US);
Abstract
An improved coal deashing process wherein coal is mixed with a coal liquefaction process solvent, solubilized and flashed to provide a prepared mixture and the prepared mixture is mixed with a deashing solvent to produce a feed mixture. Thereafter, the feed mixture is separated in a first separation zone into a first heavy fraction comprising insoluble coal products and a first light fraction comprising soluble coal products and solvents. The first light fraction is recovered and a second portion of the deashing solvent is mixed with the first light fraction prior to introduction into a second separation zone wherein an improved separation occurs to produce a second light fraction comprising the solvents and a second heavy fraction comprising the soluble coal products which is recovered. The second light fraction is withdrawn and separated in a third separation zone into a third heavy fraction comprising the liquefaction process solvent for recycle to aid in solubilization of the coal and a third light fraction comprising the deashing solvent for recycle to aid in the production of the feed mixture.