Purification of bidentate organophosphorous extractants

Details Purification of bidentate organophosphorous extractants Purification of bidentate organophosphorous extractants

1989-05-30

1991-03-19

Shah, Mukund J.

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

Organic compounds

Phosphorus esters

558170, 564 15, C07F 902

Patent

active

050012509

ABSTRACT:
Crude N,N-dialkylcarbamoylmethylphosphonates and phosphine oxide extractants, and particularly crude dihexyl N,N-diethylcarbamoylmethylphosphonate and octylphenyl N,N-diisobutylcarbamoyl phosphine oxide, are purified by distilling the crude materials in a thin film evaporator. Preferably, the crude dihexyl N,N-diethylcarbamoylmethylphosphonate is reacted with concentrated hydrochloric acid and subsequently reacted with aqueous sodium hydroxide prior to distillation in the thin film evaporator to hydrolyze impurities contained in the crude product. The purified extractants are useful for extracting actinides and lanthanides from liquid waste streams.

REFERENCES:
patent: 4038329 (1977-07-01), Palmer
patent: 4165360 (1979-08-01), Casper et al.
patent: 4760166 (1988-07-01), Stautzenberger

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