Food grade phosphoric acid from wet process phosphoric acid

Details Food grade phosphoric acid from wet process phosphoric acid Food grade phosphoric acid from wet process phosphoric acid

C - Chemistry, Metallurgy

01

B

23/72, 204/98.03

C01B 25/22 (2006.01) C01B 25/234 (2006.01)

Patent

CA 1071836

FOOD GRADE-PHOSPHORIC ACID FROM WET PROCESS ACID ABSTRACT OF THE DISCLOSURE A process for purifying wet process phosphoric acid to a food grade phosphoric acid by a sequence of steps including extraction, partial neutralization, dilution with water, con- tact with activated carbon, neutralization to a pH of from about 5 to about 9, contact with activated carbon, contact with an insoluble alkaline earth metal phosphate salt, re- conversion to a purified food grade phosphoric acid, and re- covery of the product acid.

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