Continuous process for preparing phosphoric acid and calcium sul

Details Continuous process for preparing phosphoric acid and calcium sul Continuous process for preparing phosphoric acid and calcium sul

1985-10-29

1988-10-11

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423166, 423167, 423319, 423555, C01B 2516

Patent

active

047770279

ABSTRACT:
There is described a process which comprises adjusting on the one hand the flow rates of a circulating mixture relative to a base flow rate according to very specific specifications, and on the other hand so adjusting the reaction conditions in succeeding reaction zones as to obtain a production phosphoric acid with a P.sub.2 O.sub.5 concentration between 33 and 52%, and a H.sub.2 SO.sub.4 concentration between 0.25 and 2.5%, and calcium sulphate in the form of dihydrate, hemihydrate, anhydrite or a mixture of at least two said crystalline forms.

REFERENCES:
patent: 3632307 (1972-01-01), Van Es et al.
patent: 4298583 (1981-11-01), Davister et al.
patent: 4524057 (1985-06-01), Bigot
Slack, Phosphoric Acid, vol. 1, Part 1, (1968), Marcell Dekker Inc., pp. 91-96.

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