Preparation of monocalcium phosphate and/or phosphoric acid from

Details Preparation of monocalcium phosphate and/or phosphoric acid from Preparation of monocalcium phosphate and/or phosphoric acid from

1981-09-29

1984-03-06

Meros, Edward J.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423167, 423319, C01B 2522, C01B 2532

Patent

active

044353707

ABSTRACT:
Monocalcium phosphate, phosphoric acid and/or potassium phosphate, calcium fluoride and gypsum are produced in a process involving acidulation of phosphate rock with phosphoric acid, and wherein monocalcium phosphate dissolved in phosphoric acid is formed during acidulation. In important features, insolubles and impurities are removed and a portion of the monocalcium phosphate may be separated and recovered. Alkali metal ion is added to the solution to form alkali metal fluosilicate, such as K.sub.2 SiF.sub.6, is separated and hydrolyzed with calcium ion to form CaF.sub.2 and the solution is recycled as RH.sub.2 PO.sub.4 /H.sub.3 PO.sub.4 for further reaction with fluorides, where R is alkali metal. A portion of the MCP/H.sub.3 PO.sub.4 solution and/or crystallized monocalcium phosphate can then be reacted with potassium sulfate, potassium bisulfate, or mixtures thereof, to form KH.sub.2 PO.sub.4 or KH.sub.2 PO.sub.4 /H.sub.3 PO.sub.4 solutions, and gypsum or with H.sub.2 SO.sub.4 to produce phosphoric acid. The remaining monocalcium phosphate/phosphoric acid solution can be reacted with sulfuric acid to produce phosphoric acid product and the recycle phosphoric acid required in the phosphate rock acidulation step.

REFERENCES:
patent: 2954275 (1960-09-01), Carothers et al.
patent: 2976141 (1961-03-01), Carothers et al.
patent: 3619136 (1971-11-01), Case
patent: 3792151 (1974-02-01), Case
patent: 4026995 (1977-05-01), Case
patent: 4086322 (1978-04-01), Drechsel
patent: 4160657 (1979-07-01), Drechsel
patent: 4222990 (1980-09-01), Drechsel
Pozin, M. E., et al.; "Phosphoric Acid Production"; Chem. Absts., vol. 73, 1970, p. 109, No. 5499m.
Drechsel, E. K., "Phosphate Conversion:-A New Perspective"; presentation to Amer. Chem. Soc.; San Francisco, Calif.; Sep. 1, 1976.
"Processes Recover Fluoride from Phosphate"; Technology, C&EN, Sep. 24, 1979; pp. 37-38.

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