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AssigneeStauffer Chemical Company
InventorsGregory G. Arzoumanidis, Kirk V. Darragh
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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.
A process comprising reacting, in the absence of a catalyst and under an acidic condition, phosphine with an aqueous solution of hydrogen peroxide, wherein the reacting step is initially accomplished in the presence of a quantity of hypophosphorous acid to initially produce the acidic condition, to produce an acid solution containing hypophosphorous acid (H.sub.3 PO.sub.2) as the predominant phosphorus containing acid.
In a process for producing a non-transition metal hypophosphite of the type wherein phosphorus is reacted with an aqueous non-transition metal hydroxide composition to produce the hypophosphite and byproduct phosphine, the improvement comprising converting a substantial portion of the byproduct phosphine to hypophosphite by reacting, in the absence of a catalyst and under an acidic condition, the phosphine with an aqueous solution of hydrogen peroxide to produce an acid solution containing hypophosphorous acid (H.sub.3 PO.sub.2) as the predominant phosphorus containing acid, wherein the step of reacting the phosphine with the aqueous solution of hydrogen peroxide is initially accomplished in the presence of a quantity of hypophosphorous acid to initially produce the acidic condition, and then contacting the acid solution with a non-transition metal hydroxide, oxide or carbonate to produce a product composition containing the hypophosphite.
A process comprising:
In a process for producing a non-transition metal hypophosphite of the type wherein phosphorus is reacted with an aqueous non-transition metal hydroxide composition to produce the hypophosphite and byproduct phosphine, the improvement comprising converting a substantial portion of the byproduct phosphine to hypophosphite by reacting, in the absence of a catalyst and under an acidic condition, the phosphine with an aqueous solution of hydrogen peroxide to produce an acid solution containing hypophosphorous acid (H.sub.3 PO.sub.2), contacting the acid solution with a non-transition metal hydroxide, oxide or carbonate to produce a product composition containing the hypophosphite and then contacting the product composition with activated carbon to remove any hydrogen peroxide contained in the product composition.
Dependencies are inferred from the claim text.