Spherical ion exchange resin having matrix-bound metal hydroxide, method for producing the same and method for adsorption treatment using the same
AssigneeUnitika Ltd.
InventorsYoshiaki Echigo, Yoshiyuki Suematsu, Tadashi Ishikura
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Abstract
A spherical ion exchange resin composed of a phenolic resin and a metal hydroxide is disclosed. The metal hydroxide is enclosed and bound with the phenolic resin. A method for producing such an ion exchange resin and a method for selectively adsorbing ions using the same is also disclosed. The ion exchange resin is capable of efficiently recovering ions contained or dissolved in water in trace amounts and, hence, can be applied to any aqueous solution containing ions. For example, it can be used to recover useful substances from sea water and to purify waste waters from nonferrous refineries and nuclear power plants.
Claims15
A spherical ion exchange resin, comprising:
- a cross-linked phenolic resin;
- and
- a water insoluble multivalent metal hydroxide, wherein said metal hydroxide is enclosed and bound by a matrix of the cross-linked phenolic resin.
A method for producing a spherical ion exchange resin, comprising the steps of:
- subjecting a phenol compound to precondensation with an aldehyde compound in the presence of an acid catalyst to provide a reaction mixture;
- incorporating a compound selected from the group consisting of a multivalent metal salt or an oxide into the reaction mixture while the reaction mixture retains its fluidity;
- dispersing the mixture in a medium;
- subjecting the dispersed mixture to poly-condensation in a state of suspension until the reaction is completed;
- treating with an alkaline agent;
- and
- obtaining the spherical ion exchange resin comprised of the cross-linked phenolic resin and water insoluble multivalent metal hydroxide, wherein the water insoluble multivalent metal hydroxide is enclosed and bound by a matrix of the cross-linked phenolic resin.
A method of adsorption treatment, comprising the steps of:
- mixing a spherical ion exchange resin comprised of a cross-linked phenolic resin and a water insoluble multivalent metal hydroxide, wherein the water insoluble multivalent metal hydroxide is enclosed and bound by a matrix of the cross-linked phenolic resin, with a solution containing ions;
- and
- allowing the ion exchange resin to selectively absorb ions from the solution.
Dependencies are inferred from the claim text.