Selective recovery of tin by solvent extraction using branched t

Details Selective recovery of tin by solvent extraction using branched t Selective recovery of tin by solvent extraction using branched t

1989-07-20

1991-07-02

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210639, B01D 1100

Patent

active

050283340

ABSTRACT:
Disclosed are processes for the selective extraction of tin from aqueous acidic solutions bearing tin and other metal cations. Branched tertiary phosphine oxides comprising at least two branches per alkyl group show higher extraction coefficients, E, for tin than other metals, e.g. zinc (III), iron (II), iron (III), copper (II) and lead (II). Novel compositions for selectively extracting tin comprising combinations of symmetrical branched phosphine oxides and unsymmetrical phosphine oxides are also disclosed.

REFERENCES:
patent: 3556305 (1971-01-01), Shorr
patent: 3850203 (1974-11-01), Shobert
patent: 3957504 (1976-05-01), Hu et al.
patent: 3993566 (1976-11-01), Goldberg et al.
patent: 4755299 (1988-07-01), Bruschke

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