Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Reexamination Certificate
2005-03-31
2008-05-20
Langel, Wayne A. (Department: 1793)
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
C423S157300, C423S309000, C423S312000
Reexamination Certificate
active
07374740
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.
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Joseph A. Babor, Basic College Chemistry (1947), Thomas Y. Crowell Company, p. 298, no month.
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Clark Don
Meng Xiangsheng
Peacock Alan
Tsobanakis Paris
Weyrauch Colin
Cargill Incorporated
Langel Wayne A.
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