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US 5,557,003 AGranted
Alkylphenoxy substituted bis (thio phosphoryl) amines
AssigneeZeneca Limited
InventorsJohn Campbell, Raymond F. Dalton, Peter M. Quan
Life of this patent
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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.
Claims17
A compound of the formula:
- ##STR15## wherein R.sup.1 is a 2-alkylphenoxy group in which the phenoxy residue may optionally carry one or more additional substituents, each of R.sup.2, R.sup.3 and R.sup.4, independently, is a phenyl group, an alkyl substituted phenyl group or a 2-alkylphenoxy group in which the phenoxy residue may optionally carry one or more additional alkyl substituents, and at least one 2-alkylphenoxy group contains a tertiary alkyl group.
Dependencies are inferred from the claim text.