Polydithiocarbamate resin
AssigneeNational Starch and Chemical Investment Holding Corporation
InventorsAlvie L. Foster, Jr., Ivonne C. Weidner, Maurice R. Smith
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a solid chelating resin consisting of a reactive hydrophobic backbone having pendent carbodithioic groups. Preferably the resin is a poly(dithiocarbamate) containing no tertiary nitrogen groups. The invention is also directed to a novel process for making a chelating resin involving a) reacting a nucleophilic compound with carbon disulfide in a suitable solvent, to form a carbodithioic acid, b) neutralizing the carbodithioic acid with a base to form a carbodithioic acid salt; and c) reacting said carbodithioic acid salt with a crosslinking reagent in a suitable solvent to form a solid chelating resin. The chelating resin is useful in removing metals and cationic compounds from effluent streams.
Claims8
A process for producing a chelating resin comprising:
- reacting a nucleophilic compound with carbon disulfide in a solvent, to form a carbodithioic acid;
- neutralizing said carbodithioic acid with a base to form a carbodithioic acid salt;
- and
- reacting reactive sites on said carbodithioic acid salt with a crosslinking reagent in a solvent to form a solid chelating resin.
Dependencies are inferred from the claim text.