Chemical process
AssigneeZeneca Limited
InventorsJohn Campbell, Raymond Frederick Dalton, Peter Michael Quan
Life of this patent
Estimating the term…
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.
Claims16
An amido(bisthiophosphoryl) compound having the general chemical formula:
- ##STR15## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each independently is a substituted or unsubstituted hydrocarbyl or a substituted or unsubstituted hydrocarbyloxy group, and are selected such that:
- (a) each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represents an alkyl or alkoxy group, such that the total number of aliphatic carbon atoms in R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is 16 or more, at least one of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 being an alkyl group which is branched at the point of junction with phosphorus;
- or
- (b) at least one of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is selected from the group consisting of
- i) halo or alkoxy substituted aryl or halo or alkoxy substituted aryloxy;
- ii) tertiary alkyl substituted aryl or tertiary alkyl substituted aryloxy;
- and
- iii) alkyl substituted aryl or aryloxy wherein the total number of alkyl carbon atoms is >6;
- or
- (c) at least one of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is an aryl or aryloxy group, at least one of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 being an alkoxy group, the total number of alkoxy carbon atoms being at least 10;
- or
- (d) R.sup.1 and R.sup.2 together with the phosphorus atom and/or R.sup.3 and R.sup.4 together with the phosphorus atom form a 5-8 membered heterocyclic group.
Dependencies are inferred from the claim text.