Partial purification of wet-process phosphoric acid with acetone

Details Partial purification of wet-process phosphoric acid with acetone Partial purification of wet-process phosphoric acid with acetone

1978-02-24

1979-05-01

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423310, 423313, 71 35, C01B 2522, C01B 2528

Patent

active

041524020

ABSTRACT:
An improved process for the purification of wet-process phosphoric acid (WPPA) with acetone and ammonia. The main product is the purified acid and a byproduct is the impure acid fraction in a liquid form containing most of the impurities including the added ammonia. The WPPA is mixed with acetone and the specified amount of ammonia to form two liquid phases that separate rapidly. The top layer contains about 75 percent of the phosphoric acid, nearly all the acetone, and a small fraction of the impurities. The bottom liquid layer has a viscosity usually in the range of 40 to 2500 centipoises, depending on the acid concentration and the amount of ammonia used. The acetone is distilled from the two liquid phases for recycle to the process.

REFERENCES:
patent: 3764657 (1973-10-01), Frankenfeld et al.
patent: 3894143 (1975-07-01), Von Semel et al.
Kim et al., J. Agr. Food Chem., vol. 22, No. 6, 1974, pp. 1099-1106.

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