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

C - Chemistry, Metallurgy

01

B

C01B 25/165 (2006.01) C01B 25/163 (2006.01)

Patent

CA 2043351

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 reac- ting white phosphorus and an alkali metal hydroxide in an aqueous medium to pre- pare 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 hypo- phosphite from the concentrating compartment and concentrating and crystalliz- ing the thus purified solution.

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