Rhodia Limited

Rhodia Consumer Specialties Limited

Floryan De Campo

Shiming Wo

Gordon Docherty

In a process for the production of dialkylphosphinic acids, especially branched, dialkylphosphinic acids in high purity via the reaction of an alpha olefin with a hypophosphorous acid or a salt thereof, the improvement comprising conducting the reaction in the presence of a stoichiometric excess of the olefin and isolating and purifying the desired dialkylphosphinic acid product by neutralizing the monoalkylphosphinic acid by-product with an aqueous base; removing the aqueous phase in which the neutralized monoalkylphosphinic acid is preferentially solubilized; acidifying the dialkyl product in the organic phase; and isolating the purified product.

Process for the preparation of highly purified, dialkyl phosphinic acids

Halogenated phosphines are produced by reacting a secondary phosphine with a quaternary phosphonium halide, in a solvent/carrier for the reactants.

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Mount Pleasant, SC, United States of America

Floryan De Campo