Process for the production of alkali metal hypophosphites

Details Process for the production of alkali metal hypophosphites Process for the production of alkali metal hypophosphites

1991-05-29

1993-07-06

Niebling, John

Chemistry: electrical and wave energy

Processes and products

423307, C25B 114, C01B 2526

Patent

active

052250520

ABSTRACT:
High purity alkali metal hypophosphites are produced in high efficiency by a simple step of using no other separating agents than white phosphorus, alkali metal hydroxides and water as reaction raw materials, resulting in no need of a complicated procedure for removing impurities. This process comprises reacting white phosphorus and an alkali metal hydroxide in an aqueous medium to prepare a crude solution of an alkali metal hypophosphite containing the phosphite, feeding the crude solution to a desalting compartment of an electrodialytic cell in which cation exchange membranes and univalent anion permeable membranes are alternately arranged between a cathode and an anode to form at least one pair of a desalting compartment and a concentrating compartment, so as to separate the hypophosphite from the crude solution, during which a dilute solution of an alkali hypophosphite is fed to the concentrating compartment, subjecting them to electrodialysis, withdrawing the purified solution of the alkali metal hypophosphite from the concentrating compartment and concentrating and crystallizing the the thus purified solution.

REFERENCES:
Yamamoto et al., "Regeneration of bath for nickel coating", CA 111:62429r, 1989.
Zobel, "The Piesteritz hypophosphite process", CA 112:16121z, 1990.

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