Asahi Kasei Kogyo Kabushiki Kaisha

Heiichiro Obanawa

Kunihiko Takeda

Tetsuya Miyake

Minoru Akiyama

In a process for continuously separating uranium isotopes, .sup.235 U and .sup.238 U, by oxidation-reduction chromatography using a column of an anion exchanger, the separation of uranium isotopes and the regeneration of the oxidizing agent and reducing agent both deactivated during the separation of uranium isotopes can be simultaneously effected in a single column by returning to and passing through the column of an anion exchanger having a uranium adsorption zone an eluate containing a deactivated oxidizing agent and a deactivated reducing agent to regenerate the deactivated oxidizing agent and the deactivated reducing agent and to form an oxidizing agent zone, and returning to and passing through the column the regenerated reducing agent for the reduction of uranium.

Process for separating uranium isotopes by oxidation-reduction

A composite porous material comprising a particulate inorganic porous material and, contained in the pores of the material, an organic resin having a micro-void. The composite porous material has a surface area larger than that of the inorganic porous material. The composite porous material has a high dimensional stability comparable to that of an inorganic porous material while exhibiting a high separating and adsorbing capacity comparable to that of the conventional ion exchange resin or chelate resin. Therefore, it can advantageously be used as an adsorbent for various compounds or ions as well as a packing material for gas or liquid chromatography.

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Kamakura, Japan

Heiichiro Obanawa