Preparation of purified or condensed phosphoric acid

Details Preparation of purified or condensed phosphoric acid Preparation of purified or condensed phosphoric acid

C - Chemistry, Metallurgy

01

B

23/384, 23/60

C01B 25/12 (2006.01) B01D 1/02 (2006.01) C01B 25/24 (2006.01) C01B 25/26 (2006.01) C01B 25/28 (2006.01) C01B 25/40 (2006.01)

Patent

CA 1103887

THE PREPARATION OF PURIFIED OR CONDENSED PHOSPHORIC ACID A B S T R A C T Wet process phosphoric acid is heated, preferably in carbon apparatus and by passing alternating current through the acid to concentrations above 76% P2O5 and preferably temperatures above 500°C to remove sulphate and fluoride and convert organic and basic impurities into a filterable precipitate: the acid is separated from the precipitate to provide a high purity cry- stallisable product.

300997

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