Process for producing hypophosphorous acid (H.sub.3 PO.sub.2) an

Details Process for producing hypophosphorous acid (H.sub.3 PO.sub.2) an Process for producing hypophosphorous acid (H.sub.3 PO.sub.2) an

1979-05-03

1981-05-05

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423307, C01B 2512, C01B 25165

Patent

active

042658667

ABSTRACT:
A process for producing hypophosphorous acid (H.sub.3 PO.sub.2) by reacting, in the absence of a catalyst and under an acidic condition, phosphine with an aqueous solution of hydrogen peroxide to produce an acid solution. The acid solution is then contacted with an non-transition metal hydroxide, oxide or carbonate, e.g. sodium hydroxide, to produce a product composition containing a hypophosphite, e.g. sodium hypophosphite (NaH.sub.2 PO.sub.2.H.sub.2 O). The process of this invention finds particular utility in processes of the type wherein phosphorus is reacted with an aqueous non-transition metal hydroxide composition, e.g. an aqueous suspension of a sodium hydroxide and calcium hydroxide, to produce a hypophosphite and byproduct phosphine. The process of this invention converts a substantial portion of the byproduct phosphine to hypophosphite.

REFERENCES:
Sienko et al., Chemistry, Second Edition, McGraw-Hill Book Co., Inc. (1961), pp. 318-320.
Masterson, et al., Chemical Principles, Second Edition, W. B. Saunders Co., pp. 362-364.
Paris and Tardy, COMPT. rend 223 (1946) 242/3.
Chemical Abstracts, vol. 76 (1972), 50585j.

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