Unitika Ltd.

Masahiro Kazigase

Masahide Hirai

Hiroyuki Uejima

Minoru Saito

Mikio Fujimura

A phenolic chelate resin comprising the three-dimensional product obtained by cross-linking a phenolic compound represented by the general formula (I): ##STR1## (wherein M is an alkali metal atom, an ammonium group, or a hydrogen atom, and R.sub.1 and R.sub.2, which may be the same or different, each is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms) with a phenol and an aldehyde. The phenolic chelate resin selectively adsorbs ferric ion and/or cupric ion in an acidic aqueous solution at a pH of 3 and less.

Phenolic chelate resin and method of adsorption treatment

A high adsorption capacity phenolic chelate resin consisting of a heavy metal-adsorbing phenolic chelate resin, containing iminodiacetic acid groups in the phenol nuclei, and having an adsorbability to a heavy metal in the proportion of at least 1.2 m equivalent per g of dried terminal Na type resin, said phenolic chelate resin being prepared from phenols, aldehydes and iminodiacetic acid.

Phenolic chelate resin

A phenolic chelate resin having a high heavy-metal chelating ability and capable of being reused is produced by polycondensing a phenol containing an iminodiacetic acid group with an aldehyde.

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Uji, Japan

Masahiro Kazigase