Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1984-09-06
1986-06-03
Doll, John
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
210777, 423319, 423321R, C01B 2516
Patent
active
045929017
ABSTRACT:
A process for removing impurities from phosphoric acid, especially concentrated wet process phosphoric acid, comprises filtering phosphoric acid through a filter cake (e.g., diatomite) on a porous member at a temperature in the range of about 57.degree. C. to about 77.degree. C. The filter cake retains some phosphate values. A major portion of the phosphate values retained by the filter cake can be introduced into the phosphoric acid manufacturing process, as by slurrying the filter cake in water, separating the aqueous phase from the solid phase, and introducing the aqueous phase to a wet process phosphoric acid process (e.g., as a "gypsum" filter wash).
REFERENCES:
patent: 3642439 (1972-02-01), Moore et al.
patent: 4235854 (1980-11-01), Smith et al.
Perry, Chemical Engineers' Handbook, Third Edition (1950), pp. 976-980, McGraw-Hill Book Co., Inc.
Atwood Wesley W.
Myrick John S.
Smith Hudson C.
Sweat Samuel F.
Doll John
Langel Wayne A.
Occidental Petroleum Corporation
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