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US 5,164,095 AGranted
Dithiocarbamate polymers
AssigneeNalco Chemical Company
InventorsJohn W. Sparapany, John H. Collins
Life of this patent
Estimating the term…
Abstract
A water soluble ethylene dichloride ammonia polymer having a molecular weight of from 500 to 10,000 which contains from 5 to 50 mole % of dithiocarbamate salt groups. Also, disclosed is the use of these polymers in removing heavy metals from water.
Claims3
A method of removing heavy metals from waters containing these metals which comprises the steps of:
- a) treating such waters with a complexing amount of a water soluble ethylene dichloride ammonia polymer having a molecular weight of from 500 to 100,000 which contains from 5 to 50 mole % of dithiocarbamate salt groups, to form a complex of these heavy metals;
- b) allowing such complexes to rapidly settle from the water as a precipitate;
- c) and, separating the precipitate from the water.
Dependencies are inferred from the claim text.