Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
210688, 521 29, C08L 7900
A resin chelating agent and process for making it are disclosed. The process comprises reacting the crosslinked product formed from the reaction of an aqueous suspension of a polyethyleneimine with a polycarboxylic acid with a mixture of a caustic agent comprising an alkali metal or alkaline earth metal hydroxide and carbon bisulfide to produce the finished resin. The resin can be produced in both head and powder form and is capable of selectively removing a large number of metallic contaminants from process and waste water streams. It is also essentially insensitive to the presence of alkali metal and alkaline earth metal ions dissolved in said streams.
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J. Dingman, Jr., K. M. Gloss, E. A. Milano and S. Siggia, "Concentration of Heavy Metals by Complexation on Dithiocarbamate Resins", Analytical Chemistry, 46, No. 6, (May 1974), pp. 774-777.
D. S. Hackett and S. Siggia, "Selective Concentration and Determination of Trace Metals Using Poly(dithiocarbamate) Chelating Ion-Exchange Resins", Environmental Analysis, edited by G. W. Ewing, Academic Press, Inc., New York, New York, (1977), pp. 253-265.
Cawlfield David W.
Moore William M.
Stubbs, Jr. John L.
Briggs Sr. Wilbert J.
Clements Donald F.
Haglind James B.
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