Study On Recycling Of Sodium Erythorbate Crystal Liquor

Sodium erythorbate,vitamin C and human health are closely related in the production process of sodium erythorbate, resulting in a large amount of waste water, and sodium erythorbate, a crystallization process the crystallization mother liquor containing a large number of 2 - keto - gluconic acid, isoleucine ascorbic acid sodium, directly away it, not only resulted in substantial waste fermentation products, but also on the environment has also brought a lot of pollution, this paper summarizes the use the production methods of vitamin C (ascorbic acid) and sodium erythorbate, and the of sodium erythorbate wastewater treatment technologies at first , then on the basis of analysed and determined the main component of the crystallization mother liquor, the study design at first using the traditional method of physico-chemical desposal, and then using decolorization process treatment the recycling wastewater, carried out a explore research of recycling technology to crystallization mother liquor, It provide new use approach for the production process of the mother liquor of sodium erythorbate .The main contents of experiment were as follow:In the first part of experiment, According to the test results of mother liquor composed, making the major components into a product of the same goal using the method of acid . The influences of the amount of nitrate, reaction time, reaction temperature on the yield of the product were studied. The experimental result shows that the optimum conditions were as follows: Amount of nitricacid was 3.5mL, temperature was 75°C, reaction time was 50min.for the acid into furthe refine selection of ion exchange resin, visited the absorption value change of 830nm, 280nm (830nm reflected the content of colloid, 280nm reflected pigments) result shows colloid removal of up to 50%, Chroma was the same with the diluted 12 times of before the deal with. After decompress concentrating of condensed liquid, The crystallization of vitamin C to be frozen, purity was about 92%, yield was about 65%. Finally, the optimal conditions for the process to connect into a complete process, to verify the reliability of this technology, results showed that the selected process conditions are reliable and have good stability.The second part of experiment, COD value and chroma were still high of after recycling mother liquor, so to do further processing. This part main study the technological conditions of the dyeing waste water treatment with activated carbon adsorption and H₂O₂ oxidation were studied .The results showed that, when the pH of dyeing wsate water is 1～2, using 0.025g/mL activated carbon, 100 mL / L H₂O₂, and reacting for 50min with 350r/min agotation.the efficiency of COD removal was 84.9%, the color degree removal was 79.5%.Better results were obtained from the combined treatment.