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    • 3. 发明申请
    • PROCESS TO PRODUCE AMINOCARBOXYLIC ACIDS CONTAINING LOW RESIDUAL SALT
    • 生产含有低残留盐的氨基羧酸的方法
    • WO1996008464A1
    • 1996-03-21
    • PCT/US1995011093
    • 1995-09-05
    • THE DOW CHEMICAL COMPANY
    • THE DOW CHEMICAL COMPANYGRIERSON, Jeffrey, G.COSTAIN, Cameron, T.WILSON, David, A.
    • C07C227/40
    • C07C227/40C07C227/18
    • A method for producing an aqueous solution of an aminocarboxylic acid from an aqueous solution of an alkali metal salt of the aminocarboxylic acid is disclosed. The first step of the method is to adjust the pH of the aqueous solution of the alkali metal salt of the aminocarboxylic acid to between 1.0 and 3.0. This is done by adding a monovalent inorganic acid to the aqueous solution of the alkali metal salt of the aminocarboxylic acid to form an aqueous feed solution containing protonated aminocarboxylic acid and an inorganic alkali salt having an inorganic anion and an alkali metal cation. The second step of the method is to pass the aqueous feed solution through at least one membrane using a diafiltration process to separate the aqueous feed solution into an aqueous permeate solution, containing the alkali metal cation, and an aqueous retentate solution containing the aminocarboxylic acid.
    • 公开了一种由氨基羧酸的碱金属盐的水溶液制备氨基羧酸的水溶液的方法。 该方法的第一步是将氨基羧酸的碱金属盐的水溶液的pH调节至1.0至3.0。 这是通过向氨基羧酸的碱金属盐的水溶液中加入一价无机酸来形成含有质子化氨基羧酸的水性进料溶液和具有无机阴离子和碱金属阳离子的无机碱金属盐。 该方法的第二步是使用渗滤方法将含水进料溶液通过至少一个膜,以将含水进料溶液分离成含有碱金属阳离子的含水渗透液和含有氨基羧酸的含水滞留物溶液。