Process for the purification of phosphoric acid using amines

Details Process for the purification of phosphoric acid using amines Process for the purification of phosphoric acid using amines

1975-11-26

1976-11-09

Vertiz, Oscar R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2516

Patent

active

039911659

ABSTRACT:
A water immiscible amine-solvent system, preferably a solution of a water immiscible amine in mineral spirit solvent, is used to extract phosphate values from crude aqueous phosphoric acid solutions leaving behind impurities, e.g., calcium, magnesium, iron and aluminum. Phosphoric acid of water white quality may then be produced and removed from the amine-solvent organic phase by contacting the amine-solvent containing the extracted phosphate values with sulfur dioxide and water substantially in the absence of oxygen, the amount of water employed determining the concentration of phosphoric acid produced, thermally stripping the sulfur dioxide from the amine-solvent system substantially in the absence of oxygen in order to recycle both the amine-solvent system and sulfur dioxide.

REFERENCES:
patent: 3310374 (1967-03-01), Posey et al.
patent: 3333924 (1967-08-01), Hazen et al.
patent: 3361527 (1968-01-01), Hinkebein et al.
patent: 3367749 (1968-02-01), Koerner et al.
patent: 3479139 (1969-11-01), Koerner

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