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, 1984
Filed:
Jul. 19, 1982
Applicant:
Inventor:
William A Satterwhite, Mulberry, FL (US);
Assignee:
CF Industries, Inc., Long Grove, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423320 ; 423319 ; 71 37 ; 71 40 ; 422 62 ;
Abstract
A process for producing fertilizer-grade phosphoric acid is disclosed. In the process, a rock slurry is produced from a predetermined quantity of phosphate rock and a predetermined quantity of pond water neutralized with ammonia. A predetermined rate of sulfuric acid is added to the rock slurry to produce a reaction mixture. The improvement comprises maintaining an excess of sulfate ion in the reaction mixture.