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US 8,282,857 B2Granted
Modification of copper/iron selectivity in copper solvent extraction systems
AssigneeCytec Technology Corp.
InventorsOwen Stewart Tinkler, Keith Alan Cramer, Peter Eric Tetlow, John Campbell, Charles J. Maes
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Abstract
A solvent extraction composition comprising one or more orthohydroxyarylaldoximes and/or one or more orthohydroxyarylketoximes, and one or more selectivity modifiers consisting of phosphinic and/or phosphonic acids, and salts and esters therefore and optionally one or more equilibrium modifiers is provided.
Claims9
A solvent extraction composition comprising:
- having a copper:iron transfer ratio between 34 and 1700
- a) one or more orthohydroxyarylaldoximes and/or one or more orthohydroxyarylketoximes;
- b) one or more selectivity modifiers chosen from one or more phosphinic acid and/or phosphonic acid, and salts and esters thereof;
- c) one or more equilibrium modifiers selected from alkylphenols, alcohols, esters, ethers and polyethers, carbonates, ketones, nitriles, amides, carbamates, sulphoxides, and salts of amines and quaternary ammonium compounds;
- and
- d) a water immiscible organic solvent,
- wherein the selectivity modifier is present in a molar ratio of the o-hydroxyoxime from 0.001 to 0.05.
4 more elements
Dependencies are inferred from the claim text.