Removal of concn. of heavy metal ions from aq. soln.

摘要

A process is claimed for removing or concentrating heavy metal ions (I) from aq. soln. by bringing the aq. soln. into contact with a copoolymer (II) of ethylene, (meth)acrylic acid and (meth)acrylate ester in which up to 100% of the COOH gps. can be neutralised with metal ions. (II) is a copolymer of 40-87 wt.% ethylene, 6-25 wt.% (meth)acrylic acid, 2-30 wt.% (meth)acrylate ester and 5-25 wt.% alkylpolyglycol (meth)acrylate; the COOH gps. in (II) are neutralised with Na, K, Mg or Ca ions; (II) is in the form of granules, in which case (I) are removed by passing through a chromatography column contg. (I), or film in which case (I) are conc. by bringing the soln. into contact with the film. Pref. comonomers are 40-75 wt.% ethylene, 6-20 wt.% (meth)acrylic acid, 5-20 wt.% n-butyl, 2-ethylhexyl or lauryl acrylate and 5-20 wt.% acrylate of methyl-PEG 400, 460 or 660; adsorbed (I) can be recovered by elution with e.g. aq. NaCl, KCl, dil, HCl, etc.