Process for the preparation of highly purified, dialkyl...

Details Process for the preparation of highly purified, dialkyl... Process for the preparation of highly purified, dialkyl...

2006-05-23

2006-05-23

O'Sullivan, Peter (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus acids or salts thereof

Reexamination Certificate

active

07049463

ABSTRACT:
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.

REFERENCES:
patent: 6420598 (2002-07-01), Weferling et al.

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