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:
Feb. 19, 1980
Filed:
May. 26, 1978
David S Mitchell, San Rafael, CA (US);
Chevron Research Company, San Francisco, CA (US);
Abstract
A method is disclosed for solvent-extracting an extractable component from a mixture including the extractable component and subdivided solids, comprising: (a) maintaining a vertically extending bed comprising the solids in an extraction zone and introducing the mixture into an upper portion of the bed; (b) introducing a vaporizable liquid solvent into the upper portion of the bed; (c) providing a substantially continuous gaseous phase in contact with a lower portion of the bed; (d) maintaining a substantially continuous liquid phase comprising the solvent in contact with the upper portion of the bed above the gaseous phase, the liquid phase and gaseous phase having an interface at a vertically intermediate level, extracting the extractable component from the mixture by passing the solvent through the upper portion of the bed, and removing a liquid stream including the solvent and the extractable component from the extraction zone; (e) preventing the liquid phase from flowing downwardly through the lower portion of the bed by maintaining the gaseous phase at a pressure sufficient to support the liquid phase thereon, and vaporizing liquid adhering to solids in the lower portion of the bed; and (f) removing the solids from the lower portion of the bed.