Method of recovering alkali metal fluorides from organic slurry

Details Method of recovering alkali metal fluorides from organic slurry Method of recovering alkali metal fluorides from organic slurry

1983-08-01

1988-12-27

Castel, Benoit

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210737, 210774, 210908, 210915, C02F 152

Patent

active

047939362

ABSTRACT:
A method for recovering organic ether solvent and alkali metal fluoride from a slurry thereof such as may be formed as a byproduct in silane manufacture. First water is added to a slurry having an organic ether liquid phase and a finely-divided solid phase comprising an alkali metal fluoride. The water is added in an amount sufficiently large to reduce adherence of organic ether to the solid phase and sufficiently small not to create a discernable separate aqueous liquid phase. The slurry with added water is maintained at a treatment temperature of at least about 50.degree. C. for a treatment period of at least one minute, typically 15-30 minutes at 90.degree.-110.degree. C. Thereafter, the treated slurry is seaparated into a crude fluoride solid and an ether liquid suitable for direct recycle or recycle after simple further treatment.

REFERENCES:
patent: 3268071 (1966-08-01), Puddington et al.
patent: 3953332 (1976-04-01), Speth
patent: 4198297 (1980-04-01), Voldes-Hrieg
patent: 4374111 (1983-02-01), Lefrancois
patent: 4407783 (1983-10-01), Ulmer et al.
Condensed Chemical Dictionary, 10th Ed., 1981, p. 630.
Chemical Engineers Handbook, Perry & Chilton, Fifth Edition.

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