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AssigneeMitsui Toatsu Chemicals, Inc.
InventorsRyuichi Mita, Chojiro Higuchi, Toshio Kato, Nobuyuki Kawashima, Akihiro Yamaguchi, Shosuke Nagai, Takao Takano
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Production of DL-serine by heating a strong acid type cation exchange resin having aziridine-2-carboxylic acid absorbed thereto. Specifically, an industrial process for producing DL-serine is provided which comprises treating an alpha-halogeno-beta-aminopropionitrile or its mineral acid salt in water or a water-containing organic solvent with an alkali or alkaline earth metal hydroxide to form an alkali or alkaline earth metal aziridine-2-carboxylate, treating the reaction mixture with a strong acid type cation exchange resin to cause adsorption of aziridine-2-carboxylic acid, and thereafter heating the cation-exchange resin.
A process for producing DL-serine, which comprises causing aziridine-2-carboxylic acid to be adsorbed to a strong acid type cation exchange resin, and thereafter heating the cation exchange resin in the wet state.
A process for producing DL-serine, which comprises passing an aqueous solution or a water-containing organic solvent solution containing aziridine-2-carboxylic acid or its alkali or alkaline earth metal salt through a strong acid type cation exchange resin, and thereafter heating the cation exchange resin in the wet state.
A process for producing DL-serine, which comprises passing an aqueous solution or a water-containing organic solvent solution containing aziridine-2-carboxylic acid or its salt through a strong acid type cation exchange resin, then heating the cation exchange resin having aziridine-2-carboxylic acid adsorbed thereto in the wet state at 40.degree. to 120.degree. C., and then eluting adsorbed DL-serine from said resin.
Dependencies are inferred from the claim text.