Ion exchange resins having carbodithioate groups

Details Ion exchange resins having carbodithioate groups Ion exchange resins having carbodithioate groups

1990-10-05

1992-06-02

Page, Thurman K.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Ion-exchange polymer or process of preparing

521 30, C08F 520

Patent

active

051187167

ABSTRACT:
This invention provides a new ion exchange resin which is characterized by having carbodithioate functionality (e.i. P--CS.sub.2.sup.- M.sup.+ where P--represents the resin bead and where M is selected from Na, K and Li).
The present ion exchange resin may be prepared from a suitable non-functionalized resin bead by subjecting it to bromination, lithiation and treatment with carbon disulfide. Alternatively, a styrene-divinylbenzene resin which contains from 10 to 50 weight % DVB may be functionalized by lithiation and treatment with CS.sub.2.
The carbodithioate functionalized resin of this invention is resistant to hydrolysis and is effective for the removal of Group VIII precious metals (e.g. rhodium) from chemical process streams.

REFERENCES:
patent: 2564795 (1951-08-01), Sibley
patent: 2992210 (1961-07-01), Gluckman
patent: 3347834 (1967-10-01), Naylor
patent: 3586644 (1971-06-01), de Jong
patent: 4354007 (1982-10-01), Scott
patent: 4464515 (1984-08-01), Rempel et al.
patent: 4575541 (1986-03-01), Carpino
patent: 4670160 (1987-06-01), Moriya et al.
patent: 4731187 (1988-03-01), Moriya

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