METHOD FOR THE PREPARATION OF CALCIUM MONOHYDROGEN PHOSPHATE
First Claim
1. A method for the preparation of calcium monohydrogen phosphate comprising the steps of:
- a) digesting in an aqueous medium, during a predetermined time period, a phosphate source by an acid with formation of a pulp comprising an aqueous phase containing calcium phosphate in solution and a solid phase containing impurities,b) separating said aqueous phase containing calcium phosphate in solution and said solid phase containing impurities, for a predetermined time period to provide a separated aqueous phase containing calcium phosphate in solution,c) neutralizing said separated aqueous phase containing calcium phosphate in solution at a sufficient pH to obtain a precipitation in an aqueous medium of insoluble calcium phosphate as aforementioned calcium monohydrogen phosphate, andd) separating said aqueous medium and said calcium monohydrogen phosphate,wherein step b) is carried out at a filtration rate of at least 0.1 ton of P2O5/√
Δ
P/m2/day, between 0.1 and 5 tons of P2O5/√
Δ
P/m2/day, between 0.15 and 3 tons of P2O5/√
Δ
P/m2/day, between 0.3 and 0.9 tons of P2O5/√
Δ
P/m2/day, or between 0.4 and 0.7 tons of P2O5/√
Δ
P/m2/day, said filtration rate being calculated according to the following equation;
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Abstract
This present invention disclosure relates to a method for the preparation of calcium monohydrogen phosphate comprising an etching in an aqueous medium, during a predetermined time period, of a phosphate source with an acid with formation of a pulp comprising an aqueous phase containing calcium phosphate in solution and a solid phase containing impurities, a first separation between said aqueous phase and said solid phase, during a predetermined time period, a neutralization of said aqueous phase at a sufficient pH to obtain a precipitation of said calcium monohydrogen phosphate, a second separation between said aqueous medium and said calcium monohydrogen phosphate, characterized in that said first separation of said step b) is carried out at a filtration rate of at least 0.1 ton of P2O5/√ΔP/m2/day.
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16 Claims
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1. A method for the preparation of calcium monohydrogen phosphate comprising the steps of:
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a) digesting in an aqueous medium, during a predetermined time period, a phosphate source by an acid with formation of a pulp comprising an aqueous phase containing calcium phosphate in solution and a solid phase containing impurities, b) separating said aqueous phase containing calcium phosphate in solution and said solid phase containing impurities, for a predetermined time period to provide a separated aqueous phase containing calcium phosphate in solution, c) neutralizing said separated aqueous phase containing calcium phosphate in solution at a sufficient pH to obtain a precipitation in an aqueous medium of insoluble calcium phosphate as aforementioned calcium monohydrogen phosphate, and d) separating said aqueous medium and said calcium monohydrogen phosphate, wherein step b) is carried out at a filtration rate of at least 0.1 ton of P2O5/√
Δ
P/m2/day, between 0.1 and 5 tons of P2O5/√
Δ
P/m2/day, between 0.15 and 3 tons of P2O5/√
Δ
P/m2/day, between 0.3 and 0.9 tons of P2O5/√
Δ
P/m2/day, or between 0.4 and 0.7 tons of P2O5/√
Δ
P/m2/day, said filtration rate being calculated according to the following equation; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification