Ion exchange resins having carbodithioate groups
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United States of America Patent
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Jun 2, 1992
Issued Date -
N/A
app pub date -
Oct 5, 1990
filing date -
Nov 20, 1989
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Expired
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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.
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