Process for the dearsenication of polyphosphoric acid

Details Process for the dearsenication of polyphosphoric acid Process for the dearsenication of polyphosphoric acid

1974-10-15

1976-11-09

Vertiz, oscar R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

23262, 423321R, C01B 2116

Patent

active

039911640

ABSTRACT:
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.

REFERENCES:
patent: 1562818 (1925-11-01), Wolfes et al.
patent: 3342549 (1967-09-01), Sakomura et al.
patent: 3769384 (1973-10-01), Kovacs et al.
patent: 3790661 (1974-02-01), Wasel-Nielen et al.

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