Process for recovery of residual hydrogenation catalyst from hydrogenated nitrile rubber solution
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United States of America Patent
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Sep 22, 2020
Grant Date -
Apr 25, 2019
app pub date -
Dec 19, 2018
filing date -
Jun 22, 2016
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Abstract
Residual hydrogenation catalyst produced from reduction of nitrile rubber is recovered by a chelation step using a chelating agent and a series of extraction using semi-coagulation with polar solvents and an optional washing steps for the separation of catalyst-chelating agent complex from hydrogenated nitrile rubber solution. The chelating agent is selected from xanthate, dithiocarbamate, and trithiocarbonate compounds.
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