Studies On Aplication Of Flocculation In The Manufacture Of Vitamin C

Improving the quality of the gulonic acid which is a intermediate of vitamin c , is important to the inter-quality of vitamin c.(including crystal integrity ,order and quality extension etc.)In the thesis flocculent method as preparing treatment has better effect. Adopting deposition method and ultra-violet absorption spectrometry measure the weight of dreg and the absorbency of upper pure liquid, recognize the chitosan (main flocculent reagent) and polyacrylonitrile amide (vice flocculent reagent) as preparing treatment reagent for the ferment liquid.In the thesis superfiltrating the upper pure liquid after flocculent ,comparing the rate of wiping of the dialysis liquid before and back the superfiltration and the albumen of the upper pure liquid, conclude the optimum condition of the operating and the purgation . The experiment research expresses that under the same physical and chemical condition in same batch ferment liquid ,the main factors affect the flocculent are flocculent reagent ,temperature , the pH value of the ferment liquid. Being the index of the content of the gulonic acid , the weight of dreggy liquid , and the absorbency of upper pure liquid, adopting the orthogonal method and the error analysis method , studying the factors affecting these indexes , conclude not only the optimum condition of the flocculent:temperature 40℃,concentration 2000ppm,pH7.0, time 4h; and the factors affecting superfiltration and purgation are operating pressure ,temperature, working way ; but also the optimum working conditions: pressure 50-70kpa , temperature 40℃ below, differential pressure 100kpa.And at the same time adopting filtrate pulse anti- wash working (anti-buck compressive force 150kpa ,anti- bulk time 2-4seconds , anti-bulk period 5minutes), the collect rate of gulonic acid is 88.5% , 9 percent higher than original technics .