| 摘要 |
<p>Process for the removal metal catalyst residues from water-insoluble polymers is claimed. It comprises: (a) treating the solns. with a conc. soln. of an organic acid, (b) sepg. the acid phase from the polymer, or alternatively to (a) and (b), (c) treating the solns. with one or more dicarboxylic acids forming insoluble metal pptes., (d) sepg. the pptes. from the polymer soln.. The process is suitable for polymer obtd. by hydrogenation and for other polymers contg. metal contaminants, such as Fe, Ni, Co, Li and/or Al. An alcohol may be added in step (a) and/or (b), and an oxidant in step (c). Pref. (a) formic or acetic acid solns. contain 40-99 wt.% acid. Acid to product soln. ratio = 1:1-1:40. pref. (b) sepn. is effected by filtration. Alcohol is 2-propanol or methanol. 1 mol. of oxalic acid/1 mol. of metal is added, to regenerate the sepd. organic acid soln. (c) adipic or azelaic acids are pref. as a soln. in a hydrocarbon solvent or in an aliphatic monohydric alcohol contg. not more than 4C/molecule. They are used in amts. =1-10 mol/mol of metal. (d) sepn. is effected by filtration or centrifugation. Oxidant is hydrogen peroxide, O2, an alkyl hydroperoxide or an aryl hydroperoxide used in amt. =0.1-5 mol. of 0/mol. of metal.</p> |
