Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1990-02-21
1991-09-17
Silverman, Stanley
Liquid purification or separation
Processes
Ion exchange or selective sorption
210676, 210681, B01D 1504
Patent
active
050492837
ABSTRACT:
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.
REFERENCES:
patent: 3879287 (1975-04-01), Porter
patent: 4714767 (1987-12-01), Tanaka et al.
Greenstein and Winitz, Chemistry of the Amino Acids, Wiley, 1961, p. 1459ff.
Hasselbach Hans-Joachim
Kleeman Axel
Klenk Herbert
Weigel Horst
Degussa - Aktiengesellschaft
Shideler Krisanne
Silverman Stanley
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