Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1984-07-26
1986-03-25
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
210681, 210683, 210684, 210688, 210751, 210906, 210911, 210912, 210913, 210914, C02F 128
Patent
active
045781958
ABSTRACT:
An improved process for treating aqueous effluents and purge streams to selectively remove polluting elements such as iron, copper, lead and mercury therefrom is described. The procedure comprises contacting the effluent with a poly(dithiocarbamate) chelating agent whereby the polluting elements are absorbed. The resin is extracted with an acidic aqueous solution having a pH of from about 4 to about 6; and removing the resin. When this is done, the residual content of these polluting elements in the effluent is reduced to a level below EPA required levels so that the effluent can safely be discharged into the surrounding ecosystem. The poly(dithiocarbamate) resin containing the polluting elements can be disposed of, for example, by being deposited in an unsecured landfill.
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"Concentration of Heavy Metals by Complexation on Dithocarbamate Resins" by Joseph F. Dingman, Jr., Kenneth M. Gloss, Ellen A. Milano and Sidney Siggia in Analytical Chemistry, vol. 46, No. 6, pp. 774-777, May 1974.
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Miyazaki, Akira and Barnes, Ramon M., "Complexation of Some Transition Metals, Rare Earth Elements, and Thorium with a poly (Dithiocarbamate) Cholating Resin", Analytic Chemistry, vol. 53, 1981, pp. 299-304.
Cochran Harvey B.
Moore Sanders H.
Smith Maurice R.
Cintins Ivars
Clements Donald F.
Haglind James B.
Olin Corporation
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