| 摘要 |
PURPOSE:To obtain an amino acid economically and advantageously in good yield while preventing the foaming phenomenon due to gaseous carbon dioxide, by neutralizing an aqueous solution of an amino acid salt containing carbonic acid ions with an acid under pressure and crystallizing the amino acid at the same time. CONSTITUTION:An aqueous solution containing an amino acid salt containing carbonic acid ions is neutralized with an acid, e.g. sulfuric acid or hydrochloric acid, under 0.5-10kg/cm<2>, preferably 2-5kg/cm<2> pressure to crystallize the amino acid at the same time. The above-mentioned solution of the amino acid slat containing the carbonic acid ions is obtained by hydrolyzing a hydantoin derivative corresponding to the amino acid in the presence of a caustic alkali and opening the hydantoin ring. The generated gaseous carbon dioxide can be recovered fro reuse very readily, continuously and economically, as a raw material for hydantoin derwatwes.
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