Hemihydrate type phosphoric acid process using reduced pressure

Details Hemihydrate type phosphoric acid process using reduced pressure Hemihydrate type phosphoric acid process using reduced pressure

1976-07-07

1979-01-02

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423320, C01F 100, C01F 500, C22B 2620, C01B 2516

Patent

active

041327608

ABSTRACT:
Phosphate rock and sulfuric acid are reacted under conditions which result in the formation calcium sulfate hemihydrate and phosphoric acid of about 30% to about 55% P.sub.2 O.sub.5. A two vessel reaction system is used in which the reaction slurry undergoes inter- and intra- vessel circulation. This results in excellent dispersion of reactants and minimization of temperature and concentration gradients throughout the slurry.

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patent: 2968544 (1961-01-01), Zeitz et al.
patent: 3257168 (1966-06-01), Chelminski
patent: 3416889 (1968-12-01), Caldwell
patent: 3418077 (1968-12-01), Robinson
patent: 3453076 (1969-07-01), Long et al.
patent: 3522003 (1970-07-01), Lopker
patent: 3522004 (1970-07-01), Lopker
patent: 3690826 (1972-09-01), Hasken
patent: 3939248 (1976-02-01), Caldwell
Slack-Phosphoric Acid-1968, pp. 383 to 385.

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