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    • 7. 发明授权
    • Method for the recovery of aqueous solutions of free, neutral
.alpha.-amino acids from aqueous solutions of their alkali-metal salts
    • 从其碱金属盐的水溶液中回收游离的中性α-氨基酸的水溶液的方法
    • US5049283A
    • 1991-09-17
    • US483048
    • 1990-02-21
    • Hans-Joachim HasselbachAxel KleemanHerbert KlenkHorst Weigel
    • Hans-Joachim HasselbachAxel KleemanHerbert KlenkHorst Weigel
    • C07C227/18B01D15/04C07C227/16C07C227/40C07C229/08
    • C07C227/16
    • Aqueous solutions of free, neutral .alpha.-amino acids are recovered from aqueous solutions of their alkali-metal salts. Two equally large rectifying columns filled with a strongly acidic cation exchanger in the H.sup.+ form are used, the discharge of the first column being connected to the head of the second column. The solution of the alkali-metal salt is at first delivered to the head of the first column, then the residual solution, reduced by the alkali-metal cations adsorbed in the exchanger, is displaced to the second column by means of the addition of water. A product-free forerun is first separated at the discharge of the second column and, when free .alpha.-amino acid begins to exit in the flow-off from the second column, the receiver is changed and the delivery of water to the head of the first column continues further until a mixed pH between 5 and 7 has been achieved in the receiver. Then, the previously first column is decoupled and regenerated, the previously second column, which is now the first column, is coupled to a freshly regenerated column as second column and the entire process is repeated as often as desired.
    • 游离的中性α-氨基酸的水溶液从其碱金属盐的水溶液中回收。 使用填充有H +形式的强酸性阳离子交换器的两个同等大的精馏塔,第一塔的排放物连接到第二塔的头部。 首先将碱金属盐的溶液输送到第一塔的头部,然后通过吸附在交换器中的碱金属阳离子还原的残留溶液通过加入水而置换到第二塔 。 首先在第二柱的排出口处分离出无产物的前驱体,当游离的α-氨基酸在从第二塔的流出物中开始离开时,接收器被改变并且将水输送到 第一列继续进行,直到在接收器中达到5和7之间的混合pH。 然后,先前的第一列被解耦和再生,先前的第二列(现在是第一列)被耦合到作为第二列的新鲜再生的列,并且整个过程根据需要经常重复。