Technique for producing xylitol and dulcitol simultaneously

Abstract

The invention discloses a technique for producing xylitol and dulcitol simultaneously, comprising the following steps: (1) diluting xylose mother liquor, carrying out chromatographic separation after decoloration, filtering and ion exchange and obtaining mixed liquor; (2) preparing the xylitol: adding nutritional components into the mixed liquor, inoculating yeast seed liquor after sterilization, carrying out fermentation and obtaining fermentation liquor; (3) filtering the fermentation liquor to remove the yeast, then carrying out decoloration, filtering and ion exchange, and then obtaining crystalline xylitol by evaporation, concentration and crystallization; (4) carrying out evaporation and concentration on the mixed liquor of galactose and arabitol obtained by chromatographic separation in the step (1), concentrating to the mass concentration of 35 to 45 percent, and then carrying out catalytic hydrogenation, thus obtaining the mixed liquor of the dulcitol and the arabitol; and (5) carrying out decoloration, filtering and ion exchange on the obtained mixed liquor, putting the mixed liquor into a crystallization kettle for evaporation till supersaturation, adding dulcitol seed crystal and seed crystal growth promoter, and carrying out crystallization to obtain crystalline dulcitol.

Description

technical field [0001] The invention relates to a process for simultaneously producing xylitol and dulcitol, belonging to the field of biotechnology. Background technique [0002] Both xylitol and welmaol are polyols. Xylitol is a new type of sweetener. Eating xylitol is not easy to cause dental caries and will not increase blood sugar. Therefore, it is widely used in the food industry as a sweetener, and as a Clinical nutritional and therapeutic agents for diabetic and hepatitis patients. In addition, it is also an important chemical raw material, which is widely used in national defense, leather, plastics and coatings. Weimao alcohol, also known as sweet alcohol, galactitol, hexyl alcohol, colorless crystalline powder, slightly sweet taste, insoluble in cold water and alcohol, easily soluble in boiling water, belongs to biochemical reagents, mainly used for bacterial identification and cultivation It is an important sugar that is indispensable for microbial research, dis...

AI Technical Summary

Problems solved by technology

At present, the large-scale application of xylose mother liquor mainly focuses on the comprehensive application of the monosaccharides contained in it, such as the preparation of caramel pigment, the production of feed yeast, etc., and the value of various monosaccharides in the mother liquor cannot be fully utilized.

[0004] The patent CN 101029059A describes a method for producing welmaol by using galactose in the xylose mother liquor, but without separating and utilizing other sugars, the main sugar in the xylose mother liquor cannot be fully utilized

[0005] Patent CN 101555503A describes the method of using yeast to ferment xylose, glucose and galactose in xylose mother liquor without fermenting arabinose to prepare arabinose. Although arabinose is separated, other sugars are fermented by yeast , and the purpose of fully utilizing the main sugar in the xylose mother liquor cannot be achieved

[0006] Patent CN 1210862A proposes a process for recovering xylose from the xylose mother liquor. The xylose is recovered by dehydrating the xylose mother liquor, diluting alcohol and crystallizing. On the one hand, the recovery rate is low, and on the other hand, most of the sugar still exists in the In the mother liquor, not fully utilized