| http://www.w3.org/ns/prov#value | - The urethane products produced by such process, which may contain one or more organoselenium compounds as well as metallic selenium and/or inorganic selenium compounds, is contacted in the liquidphase with copper (I) chloride, i.e., CuCl and Cu.sub.2 Cl.sub.2, oxygen or an oxygen-containing gas such as air, and an amine or nitrile complexing solvent, to form an insoluble copper-selenium compound o
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