Chemical process

Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing

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558 84, 558155, 558157, 564 12, C07F 936, C07F 944, C07F 96574, C07F 96578

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057288534

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 from a 5- to 8-membered heterocyclic ring.

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