Process for making calciummonohydrogen phosphatedihydrate

Details Process for making calciummonohydrogen phosphatedihydrate Process for making calciummonohydrogen phosphatedihydrate

C - Chemistry, Metallurgy

01

B

23/68

C01B 25/32 (2006.01)

Patent

CA 1206322

PROCESS FOR MAKING CALCIUMMONOHYDROGEN PHOSPHATE DIHYDRATE ABSTRACT OF THE DISCLOSURE The disclosure relates to a process for making calcium- monohydrogen phosphate dihydrate with a high degree of white- ness from pure phosphoric acid and naturally occurring cal- cium carbonates. More particularly, a fine-particulate cal- cium carbonates is suspended in water and the suspension is mixed at temperatures between 0 and 60°C with phosphoric acid so as to establish a Ca/P-ratio of 0.20 up to 0.57. The phosphoric acid is added in quantities per unit time prevent-- ing the resulting mixture from foaming over. Next, solid matter constituents are separated from the mixture, after CO2 has ceased to evolve, with the resultant formation of a clear colorless acid solution. This solution and an aqueous suspen- sion or solution of pure alkali metal and/or alkaline earth metal carbonates and/or hydroxides, are jointly in- troduced into a reaction zone at a reaction temperature of 20 to 45°C so as to establish a pH-value initially of 2.0 to 5.0 and then, towards the end of the reaction, of 6.0 to 8Ø Finally, the reaction product is filtered off, washed out, and dried in known fashion.

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