Purification of phosphoric acid

Details Purification of phosphoric acid Purification of phosphoric acid

1988-12-13

1989-10-31

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423321R, C01B 2516

Patent

active

048775940

ABSTRACT:
A mixture of hydrophobic and hydrophilic extractants is used to separate phosphate values from impurities found in phosphoric acid. In one approach, impurities are removed from phosphoric acid and the phosphate values are recovered, by introducing polyphosphates and ammonium ions into the impure acid, and contacting the impure acid with a mixture of low and high molecular weight alcohols, one of which is hydrophilic and the other hydrophobic, in a single stage. The phosphate values segregate to the high molecular weight alcohol fraction, and the impurities segregate to the low molecular weight alcohol fraction. After separation of the alcohol solutions, the phosphate values and the impurities are separated from their respective extractant solutions, and the alcohols recirculated. Polyphosphates and ammonia are preferably provided by reacting a portion of the original feed acid with ammonia at elevated temperature in a pipe reactor.

REFERENCES:
patent: 3684438 (1972-08-01), Gleason
patent: 3764657 (1973-10-01), Frankenfeld et al.
patent: 3862298 (1975-01-01), Beltz et al.
patent: 3953581 (1976-04-01), Ehlers et al.
patent: 3993733 (1976-11-01), Irani
patent: 4117092 (1978-09-01), Beltz et al.

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