Process for purifying phosphoric acid for electrical semiconduct

Details Process for purifying phosphoric acid for electrical semiconduct Process for purifying phosphoric acid for electrical semiconduct

1987-10-13

1989-02-14

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2516

Patent

active

048045268

ABSTRACT:
Phosphoric acid is treated to remove and/or tie up heavy metals and antimony to enable the acid to be used in electrical semiconductor applications by reacting the acid with hydrogen sulfide and with hydrogen peroxide in separate treating steps. The hydrogen sulfide precipitates metal sulfides which are separated from the acid, and the hydrogen peroxide oxidizes dissolved antimony so that it is tied up and does not post-precipitate in the acid after removal of the metal sulfides.

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Chemical Abstracts, vol. 70, 1969, (C.A. 70:21370f), "Removal of Arsenic from Phosphoric Acid by Using Antimony Pentasulfide".
Journal of Analytical Chemistry, USSR, vol. 32 (2), pp. 223-225, "Conditions for the Formation of the Antimony(V) Orthophosphate Complex and Its Use to Mask Antimony(V) During the Coulometric Determination of Arsenic".

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