Assertion: wet process phosphoric acid | /r/HasProperty | purified to food grade phosphoric acid
Facets:
value: in accordance with the present invention
type: OTHER
Source sentences:
text: In accordance with the present invention, a wet process phosphoric acid having a concentration of from about 40% to about 64% P 2 O 5 is purified to a food grade phosphoric acid by a sequence of steps including extraction of the wet process acid, partial neutralization, dilution or stripping with water, contact 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, reconversion to a purified food grade phosphoric acid and recovery of the product acid.