Process for extracting metal values from aqueous solution

Details Process for extracting metal values from aqueous solution Process for extracting metal values from aqueous solution

1993-12-03

1995-07-18

Dawson, Robert A.

Liquid purification or separation

Processes

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

210634, 423 99, 423101, 423106, 423139, 75722, 75725, B01D 1100

Patent

active

054338557

ABSTRACT:
A process for extracting metal values especially zinc values from aqueous solutions of metal salts which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula: ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents an optionally substituted hydrocarbyl or hydrocarbyloxy group or R.sup.1 and R.sup.2 together with the attached phosphorus atom and/or R.sup.3 and R.sup.4 together with the attached phosphorus atom form a 5- to 8-membered heterocyclic ring.

REFERENCES:
patent: 4721605 (1988-01-01), Brown et al.
patent: 4721606 (1988-01-01), Brown et al.
O. Navratil et al., Darstellung von Tetraphenylestern der Imidothio-und . . . , Z. Chem., vol. 24, No. 1, 1984, p. 30.
J. Boedeker, Zur Lage Der P=S-Valenzschwingung und . . . , J. Organometal. Chem., vol. 56, 1973, pp. 255-260.
Chemical Abstracts, vol. 116, 1992, & ZH. Obschch. Khim., vol. 61, No. 6, 1991, pp. 1474-1475, N. G. Zabirov et al., & Registry (Database, STN) RN: 138319-79-6, 138319-80-9, 13819-81-0, 13819-82-1.
A. Schmidpeter et al., Chem. Ber., vol. 101, 1968, pp. 815-823.

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