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:
May. 20, 2008
Filed:
Mar. 31, 2005
Xiangsheng Meng, Chanhassen, MN (US);
Paris Tsobanakis, Inver Grove Heights, MN (US);
Alan Peacock, Minnetonka, MN (US);
Don Clark, Tampa, FL (US);
Colin Weyrauch, Brandon, FL (US);
Xiangsheng Meng, Chanhassen, MN (US);
Paris Tsobanakis, Inver Grove Heights, MN (US);
Alan Peacock, Minnetonka, MN (US);
Don Clark, Tampa, FL (US);
Colin Weyrauch, Brandon, FL (US);
Cargill, Incorporated, Wayzata, MN (US);
Abstract
Phosphate rock is reacted with phosphoric acid to produce monobasic calcium phosphate. Monobasic calcium phosphate is reacted with ammonium carbonate to produce ammonium phosphate. Dibasic calcium phosphate is also produced as a by-product when monobasic calcium phosphate reacting with ammonium carbonate. The dibasic calcium phosphate is reacted with sulfuric acid to produce phosphoric acid. The phosphoric acid is used to react with phosphate rock. Ammonium sulfate or ammonium hydroxide may be used instead of ammonium carbonate. Phosphate other than ammonium phosphate can be produced if calcium phosphate is reacted with x-y to produce x-phosphate, where x is lithium, sodium, ammonium or potassium and y is carbonate, bicarbonate hydroxide or sulfate.