Process for making alkali metal phosphate solutions containing l

Details Process for making alkali metal phosphate solutions containing l Process for making alkali metal phosphate solutions containing l

1985-10-01

1986-12-30

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423313, 423321R, C01B 2516, C01B 1516, C01B 2526

Patent

active

046328122

ABSTRACT:
Alkali metal phosphate solutions containing little vanadium are made from phosphoric acid containing vanadium. To this end, a negative redox potential is established in the phosphoric acid by addition of a reductant, the acid is partially neutralized and an alkali metal-phosphorus-molar ratio between 0.85 and 1.0 is established, the partial neutralization being continued over a period of at least 10 minutes. The partially neutralized acid is not filtered intermediarily and the alkali metal/phosphorus-molar ratio is increased to 1.9 to 2.1 in a second neutralization stage, collected precipitate is separated and processed, if desired.

REFERENCES:
patent: 3764655 (1973-10-01), Ehlers et al.
patent: 4053562 (1977-10-01), Harnisch et al.
patent: 4134962 (1979-01-01), Ehlers et al.
patent: 4490336 (1984-12-01), Worthington et al.

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