Ceskoslovenska Akademie Ved

Vysoka Skola Chemicko-technologicka

Zdenek Matejka

Jaroslav Kahovec

Josef Tomasek

Jarcslay Eliasek

Method of separating heavy metals from complex-forming substance of aminocarboxylic acid type, or salts thereof in aqueous solutions, as well as a method of removing heavy metals from the solutions containing said complex-forming substance. A solution containing heavy metals in complex form and complex-forming substances of aminocarboxylic acid type is contacted with a ion exchanger having polyethyleneimine active groups, whereupon free non-complexed heavy metal cations are displaced out of said ion exchanger by an acid solution of 0.5-30 percent concentration, and the ion exchanger is converted back into its active form by a solution of an alkali hydroxide, carbonate, or hydrogen carbonate of 0.5-30 percent concentration. The method is applicable in the treatment of waste water from electroless copper plating processes in the electronic industry, also for the removal of heavy metals in complex form from solutions left after ore leaching in the hydrometallurgical industry, and for purifying decontamination solutions in nuclear power stations.

Method of separating heavy metals from complex-forming substances of

Polymeric polydonor complexons having more than six sites in a structural unit are described. The complexons are of the formulae: ##STR1## wherein  P is a linear or three-dimensional polymeric skeleton, x is oxygen or an ##STR2## group wherein R is hydrogen, an alkyl group of 1-6 carbon atoms, a phenyl group or a substituted phenyl group. The described complexons are obtained by reaction of a polymeric compound of the formula  P --XH wherein  P and X are as defined above with a dianhydride of the corresponding complexon in the presence of a tertiary amine and, optionally, an inert solvent.

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Zdenek Matejka