METHOD OF PRODUCING AQUEOUS SOLUTION CONTAINING ALKALI METAL-CONTAINING INORGANIC SALT AND METHOD OF PRODUCING SOLUTION CONTAINING CARBOXYALKYL AMINO GROUP-CONTAINING COMPOUND AND WATER-INSOLUBLE SOLUTION

PROBLEM TO BE SOLVED: To provide a method of producing an aqueous solution containing an alkali metal-containing inorganic salt or a carboxyalkyl amino group-containing compound by efficiently separating them from an aqueous solution containing the alkali metal-containing inorganic salt and the carb...

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Hauptverfasser: INOUE SATOSHI, KOYANAGI SHIGERU, FURUSAWA TAKASHI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a method of producing an aqueous solution containing an alkali metal-containing inorganic salt or a carboxyalkyl amino group-containing compound by efficiently separating them from an aqueous solution containing the alkali metal-containing inorganic salt and the carboxyalkyl amino group-containing compound.SOLUTION: A method of producing an aqueous solution of an alkali metal-containing inorganic salt or a water-insoluble solution containing a carboxyalkyl amino group-containing compound includes the steps of: adjusting the pH value of an aqueous solution containing the alkali metal-containing inorganic salt and the carboxyalkyl amino group-containing compound to 6.0 or less; subsequently, adding a water-insoluble solvent to the aqueous solution and separating a water-insoluble solvent phase containing the carboxyalkyl amino group-containing compound and a water phase containing the alkali metal-containing inorganic salt; and collecting the separated water-insoluble solvent phase and water phase respectively.