Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1979-02-14
1980-12-09
Prescott, Arthur C.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204301, B01D 1302
Patent
active
042383064
ABSTRACT:
The invention provides a process for the separation, by electrodialysis, of a mixed aqueous solution containing a non-essential amino acid and a derivative of that acid in ionic form, into at least two separate product solutions of acid and derivative respectively, of which at least one solution contains highly pure product obtained at high quantitative yield, comprising providing an electrodialysis stack, continuously introducing a feed solution containing a non-essential amino acid and derivative thereof to be separated into feed cells of the stack, adjusting the flow rate and concentration of the solution and the electric current density applied to values adapted to create concentration polarization conditions adjacent to the membranes in the feed cells thereby accumulating a high local concentration of protons upon the surface of the anion exchange membranes, and a high local concentration of hydroxyl ions upon the cation exchange membranes and maintaining the pH of the bulk solution in the feed cells in a range of between 4-8, irrespective of the isoelectric point of the amino acid, in order to adjust for pH changes of the bulk solution occurring due to unequal rates of water dissociation at the cation and anion exchange membranes.
REFERENCES:
patent: 3051640 (1962-08-01), Traxler
patent: 3330749 (1967-07-01), Kuwata et al.
patent: 3972791 (1976-08-01), Stern
Kedem Ora
Perry Mordechai
Prescott Arthur C.
Research Products Rehovot Ltd.
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