Mitsubishi Chemical Corporation

Youichi Tamura

Hiroshi Arataki

Takeshi Teraue

Kiyoto Ando

Akihiko Tsukada

A process for the preparation of an anion exchange resin is described, which comprises reacting an aromatic crosslinked haloalkyl-containing copolymer with an amine in the presence of at least 100 parts by weight, per 100 parts by weight of the copolymer, of water and at least 5 parts by weight, per 100 parts by weight of water, of a water-soluble inorganic salt. A process for the preparation of an anion exchange resin is also described, which comprises acting a haloalkylating agent on an aromatic crosslinked copolymer, separating an unreacted portion of the haloalkylating agent from the aromatic crosslinked haloalkyl-containing copolymer so obtained, and reacting the resulting haloalkyl-containing copolymer with an amine in the presence of at least 100 parts by weight, per 100 parts by weight of the copolymer, of water and at least 5 parts by weight, per 100 parts by weight of water, of a water-soluble inorganic salt.

Process for preparation of anion exchange resin

In a reaction for introducing chloromethyl groups into an aromatic crosslinked copolymer by reacting chloromethyl methyl ether to the aromatic crosslinked copolymer in the presence of a chloromethylation reaction catalyst, a method for recovering chloromethyl methyl ether from the reaction mixture, which comprises the following steps 1) a step of adding to the reaction mixture an aqueous acid solution which is capable of dissolving the chloromethylation reaction catalyst without decomposing chloromethyl methyl ether, and an extraction solvent which is inert to and miscible with chloromethyl methyl ether and which is capable of swelling the chloromethylated aromatic crosslinked copolymer, 2) a step of contacting hydrogen chloride gas to the reaction mixture and the extract solution from the step 1 to convert decomposition products of chloromethyl methyl ether, to chloromethyl methyl ether, 3) a step of separating the resulting mixture from the step 2 into an extraction solvent layer containing chloromethyl methyl ether and an acid-containing aqueous layer, and 4) a step of separating the chloromethyl methyl ether from the extraction solvent layer separated in the step 3.

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Kitakyushu, Japan

Youichi Tamura