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:
Jun. 03, 1986
Filed:
Sep. 06, 1984
Hudson C Smith, Lake City, FL (US);
Wesley W Atwood, Lake City, FL (US);
John S Myrick, Lake City, FL (US);
Samuel F Sweat, Lake City, FL (US);
Occidental Petroleum Corporation, Los Angeles, CA (US);
Abstract
A process for removing impurities from phosphoric acid, especially concentrated wet process phosphoric acid, comprises filtering phosphoric acid through a filter cake (e.g., diatomite) on a porous member at a temperature in the range of about 57.degree. C. to about 77.degree. C. The filter cake retains some phosphate values. A major portion of the phosphate values retained by the filter cake can be introduced into the phosphoric acid manufacturing process, as by slurrying the filter cake in water, separating the aqueous phase from the solid phase, and introducing the aqueous phase to a wet process phosphoric acid process (e.g., as a 'gypsum' filter wash).