Patents
A process for desalting of amino acid and amphoteric compound by electro dialysis using ion conducting spacers which comprises;
a) electro dialyzing as herein described an aqueous solution of 50 to 20000 ppm of amino acid or amphoteric compound as herein described and 50 to 10000 ppm of sodium chloride at a pH in the range of 3 to 12 in an elertrodialytic unit operated in recirculation or batch mode, comprising a cation exchange membrane and an anion exchange membrane as herein described, number of cell pairs ranging between 1 to 100 with cation conducting spacers such as preformed inter polymers of poly ethylene styrene-divinyl benzene copolymer using after its sulfonation in juxtaposition to anion exchange membrane and anion conducting spacer after its chloromethylation and amination in juxtaposition to anion exchange membrane, anode and cathode as herein described,
b) allowing the above said amino acid/amphoteric compound- salt mixed solution and water to flow through desalted and concentrated chamber respectively as herein described at a flow rate ranging from 1 lit/hr, to 100 lit./hr in a recircuiation mode of operation, and applying a DC potential in the range of 0.5 to 2.5 V/cell pair by using an expanded precious metal oxide coated titanium as anode and thin steel plate as cathode to obtain the desired desalted product containing 50-200 ppm salt.