发明授权
US3991164A Process for the dearsenication of polyphosphoric acid 失效
多磷酸脱砷的方法

Process for the dearsenication of polyphosphoric acid
摘要:
Polyphosphoric acid is dearsenicated by placing the polyphosphoric acid in a reactor; adding a phosphorus oxo-compound containing phosphorus in the monovalent or trivalent electropositive oxidation stage; heating the resulting mixture to effect disproportionation of the phosphorus oxo-compound; and removing the resulting off-gas having arsenic therein.
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