Defluorination of phosphoric acid

Details Defluorination of phosphoric acid Defluorination of phosphoric acid

1992-06-23

1994-05-17

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423341, C01B 2516

Patent

active

053126106

ABSTRACT:
Fluorine in the form of fluoride is removed from phosphoric acid having an initial phosphate concentration of less than about 50 percent by determining the concentration of fluoride to be removed from the acid and the concentration of silicon in the acid. Silica is added to the acid in an amount sufficient that the molar ratio of fluoride to be removed from the acid to silicon in the acid is about 6. The acid is concentrated to a final phosphate concentration of greater than about 50 percent, whereupon fluoride is reacted to fluosilicic acid. By maintaining the indicated concentration ratio of fluoride to be removed and silicon, fouling of condenser and scrubber components with deposited silica is avoided.

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R. A. Wiesboeck et al., "The Acid-Catalyzed Fluoride Evolution from Wet-Process Phosphoric Acid", The American Chemical Society National Meeting (Aug. 27-Sep. 1, 1972).
William E. Rushton et al., "Defluorination of Wet Process Phosphoric Acid", 85th National Meeting of American INstitute of Chemical Engineers (Jun. 1978).

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