| http://www.w3.org/ns/prov#value | - The extracting agent phase separating out is generally evident from the intense dark color which is due to the extracted colored byproducts. [0014] Extracting agents suitable for the novel process belong in particular to the classes consisting of the alcohols, such as methanol, ethanol n-propanol or isopropanol, nitrites, such as acetonitrile, ketones, such as acetone or butanone, or esters, such
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