Method for producing xylitol and arabitol simultaneously by utilizing xylose mother liquid

Abstract

The invention discloses a method for producing xylitol and arabitol simultaneously by utilizing xylose mother liquid, which comprises the following steps: (1) diluting the xylose mother liquid, and obtaining a purifying liquid after decolorizing filtration and ion exchange; (2) adding nutrients into the purifying liquid, sterilizing, and then inoculating yeast and fermenting; (3) filtering and sterilizing the fermenting liquid, then carrying out the decolorizing filtration and the ion exchange, and carrying out initial concentration; (4) allowing the concentrated liquid to be prepared into mixed sugar alcohol by catalytic hydrogenation; (5) carrying out chromatographic separation for the mixed sugar alcohol after the decolorizing filtration and the ion exchange to obtain two fractions which are respectively a xylitol fraction and an arabitol fraction; and (6) carrying out evaporation concentration and crystallization for the two fractions so as to obtain xylitol crystals and arabitol crystals. The invention converts xylose and arabinose into xylitol and arabitol by hydrogenation, the conversion rate is higher compared with the method for producing xylitol by yeast fermentation.

Description

technical field

[0001] The invention relates to a method for simultaneously producing xylitol and arabitol by using xylose mother liquor, and belongs to the field of biotechnology. Background technique

[0002] Xylitol is a kind of pentitol, the sweetness is similar to that of sucrose, because it has anti-caries, will not cause blood sugar level rise, lose weight and other functions, so it is widely used in the food industry as a sweetener, and as a cure for diabetes and hepatitis Clinical nutritional and therapeutic agents for patients are widely used in the field of medicine. In addition, as an important chemical raw material, it is widely used in national defense, leather, plastics and coatings. Arabitol is also a pentitol, an isomer of xylitol, and has similar physiological functions to xylitol, but due to the current limited production and high price, it cannot be used in many fields like xylitol be utilized.

[0003] Xylose mother liquor is a by-product obtained aft...