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. 04, 1991
Filed:
May. 17, 1990
Applicant:
Inventors:
Solon G Whitney, Bartow, FL (US);
Harold J Kleiss, Cary, NC (US);
Assignee:
American Pembroke, Inc., Bartow, FL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08J / ; B01J / ;
U.S. Cl.
CPC ...
521 26 ; 210669 ; 210677 ; 210687 ;
Abstract
An improved method is provided for regenerating cation exchange resin loaded with metal ion impurities from wet process phosphoric acid. A regenerant solution is used composed of a mixture of ammonium sulfate and sulfuric acid in predetermined proportions which are maintained during recycle of the regenerant. This solution is preferably formed from anhydrous ammonia and sulfuric acid. Calcium and magnesium sulfates are selectively crystallized from the regenerant solution in the form of readily filterable crystals.