Method for producing vitamin C by elec-trodialysis with bipolar membrane

Abstract

The invention discloses a method for producing vitamin C by elec-trodialysis with a bipolar membrane. In the method, the elec-trodialysis with the bipolar membrane is applied to the generation of ascorbic acid in the vitamin C production process. The method comprises the following steps of: a, arranging a module between a pair of electrodes; b, pumping electrolyte into an anode chamber and a cathode chamber, pumping sodium ascorbate into a conversion chamber, and pumping gulonic acid methyl ester into a hydrolysis chamber for circulation; c, applying DC between the anode and the cathode; d, timely removing products according to the change of materials in the hydrolysis chamber, and separating the products to obtain the sodium ascorbate; and e, according to the change of the PH value in the conversion chamber, removing the products of the conversion chamber, and separating the products to obtain the vitamin C. In the method, a byproduct alkali generated in the elec-trodialysis process is fully utilized to complete hydrolyzing the gulonic acid methyl ester, a catalyst in the hydrolysis process is saved, the pH value of the alkali chamber is also reduced, and the service life of the system is prolonged.

Description

technical field [0001] The invention relates to a production method of vitamin C, in particular to a technology for applying bipolar membrane electrodialysis to convert methyl guronate into vitamin C acid. Background technique [0002] Vitamin C, commonly known as ascorbic acid, is a catalyst in the oxidation-reduction reaction of cells. It has strong activity and can participate in various metabolisms of the human body. It can reduce the fragility of capillaries, increase the body's resistance and prevent the occurrence of scurvy. Therefore, vitamin C application is becoming increasingly widespread. [0003] At present, the method of producing vitamin C usually adopts bio-fermentation method. The production process is first to ferment sodium guronate, and then use cation exchange resin to convert sodium guronate into gulonate. Gulonate reacts with methanol under acidic conditions to form guronate formazan ester, and then add sodium bicarbonate to hydrolyze methyl guronate ...

AI Technical Summary

Problems solved by technology

[0005] Although this method successfully applies the bipolar membrane electrodialysis technology to the production process of vitamin C, replacing the ion exchange resin, saving the consumption of acid and alkali, and reducing the discharge of high-salt wastewater, but a large amount of pH Sodium hydroxide with a high value has not been fully utilized, which has a certain corrosion effect on the equipment, and under such high-strength alkaline conditions, scaling and deposition of high-priced metal ions are prone to occur, which affects the operating life of the membrane system.

Images