Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1985-01-14
1986-01-21
Garvin, Patrick P.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423313, 423312, 423321R, C01B 2528
Patent
active
045656800
ABSTRACT:
In the process of the invention spent phosphoric acid is concentrated and stripped with air to a greater than 50% P.sub.2 O.sub.5 concentration to remove nitric acid. As a result of concentrating the spent acid a portion of the aluminum precipitates as monoaluminum phosphate, which is recovered by filtration. The filtrate is then ammoniated to produce a monoammonium phosphate solution. The solids precipitated during ammoniation and comprising aluminum ammonium phosphate which contains other metal phosphates are washed and reacted with aqueous ammonia to form diammonium phosphate.
REFERENCES:
patent: 995898 (1911-06-01), Peacock
patent: 3667904 (1972-06-01), Roche et al.
patent: 3974262 (1976-08-01), Crerar et al.
patent: 4044106 (1977-08-01), Fang
patent: 4073635 (1978-02-01), Suppanen
patent: 4377561 (1983-03-01), LaVanture et al.
Burke Philip E.
Gleason Carla T.
Smith Danny L.
Todd Lanny E.
Garvin Patrick P.
Stauffer Chemical Company
White Vivienne T.
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