Patent ID: 6541228
Filing Date: 2003-04-01
Classification: B01D,C07H,C12P,Y02P

Abstract:
A process for preparing a purified and concentrated gluconic acid derivative comprising the steps of;a) providing an in-vitro reactor medium comprising at least a gluconic acid derivative anion selected from the group consisting of 2,4, keto-D-gluconic acid, 2,5, diketo-D-gluconic acid, idonic acid, 2-keto-L-gluconic acid (KLG), vanillic acid and ascorbic acid, a metal counterion and a coenzyme; and b) introducing the in-vitro reactor medium to an electrodialysis cell comprising at least one alternating anion and cation exchange membrane spaced sufficiently to provide therebetween at least one feed compartment, a bipolar membrane spaced sufficiently from the cation exchange membrane to provide at least one base compartment therebetween, a bipolar membrane spaced sufficiently from the anion exchange membrane to provide at least one concentrate compartment therebetween, an anode and cathode positioned on different ends of the cell connected to a power source for providing an electric current through the cell wherein the gluconic acid derivative anion is protonated and the metal counterion adds a hydroxide ion to provide at least a concentrated aqueous solution comprising the gluconic acid derivative, a stream comprising at least a metal hydroxide solution and a waste stream containing neutrals.