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. 10, 1979
Filed:
Aug. 03, 1977
John S Rendall, Stanford-le-Hope, GB;
Rohrtil S. A., Lugano, CH;
Abstract
A continuous solvent extraction process for tar-sand uses a closed rotary contactor. A tar-sand/water slurry stream and a solvent stream are passed countercurrent through the contactor and three phases are formed: tar-sand solids at the bottom of the contactor, a barrier layer of water in which the solids are contained and an uppermost solvent phase. The solids during their travel through the contactor are repeatedly lifted off the bottom of the contactor and tumbled through the solvent phase so that the bitumen oils content of the tar-sand is progressively dissolved in the solvent. A solvent stream containing the dissolved bitumen oils is removed from one end of the contactor and discard stream consisting essentially of sand and water is removed from the other end.