Method for preparing xylitol and mixing syrup from xylose mother liquor

Abstract

The invention discloses a method for preparing xylitol and mixing syrup from xylose mother liquor. The method comprises the steps: pretreatment, specifically, a calcium hydroxide solution is added into the xylose mother liquor to adjust the pH to 8.5-9.0, carbon dioxide is introduced to adjust the pH to 6.6-7.0, and part of calcium ions are removed by cation exchange resin; chromatographic separation to obtain an extracting solution and raffinate; decolorization and filtration; hybridization and purification; evaporation, specifically, the extracting solution subjected to hybridization and purification is vacuum-concentrated till the mass percentage concentration of dry matter is 75-85%, and the raffinate is vacuum-concentrated till the mass percentage concentration of the dry matter is 65-75%, so that a finished mixing syrup product is obtained; crystallization; centrifugation and drying; dissolution and hydrogenation; and refining to obtain xylitol crystals. According to the invention, the xylose mother liquor is pretreated by calcium hydroxide and carbon dioxide; the method is simple and easy; the effect is obvious; impurities are removed; the viscosity of the xylose mother liquor is lowered; and the filtration speed is increased. All monosaccharide components of the xylose mother liquor are utilized, so that the additional value of the xylose mother liquor is increased.

Description

technical field [0001] The invention relates to the technical field of reusing xylose mother liquor, in particular to a method for preparing xylitol and mixed syrup from xylose mother liquor. Background technique [0002] As a natural five-carbon sugar alcohol, xylitol has the same sweetness and calories as sucrose, and is one of the important functional food additives. The metabolism of xylitol does not require insulin, and it can replace sucrose as a sweetener for diabetics. At the same time, xylitol is used in chewing gum as a sweetener, and also has the function of maintaining the acid-base balance of the oral cavity and preventing dental caries. [0003] At present, the production method of xylitol is mainly chemical method, that is, corn cob, bagasse and other raw materials rich in pentosan (containing 36-40% pentosan) are used, and the hydrolyzate containing xylose is obtained by acid hydrolysis. , and then through complex purification processes such as neutraliza...

AI Technical Summary

Problems solved by technology

[0007] Patent CN 101643752B introduces a method for producing xylitol and L-arabinose by using xylose mother liquor, converting xylose in xylose mother liquor into xylitol by yeast fermentation, and extracting L-arabinose by chromatographic separation , but due to the low conversion rate of yeast fermenting xylose into xylitol, the utilization rate of xylose in the xylose mother liquor is low

[0008] Patent CN101857523B introduces a method for simultaneously producing xylitol and arabitol by using xylose mother liquor, using yeast fermentation to remove glucose and galactose in xylose mother liquor, and then hydrogenation first to obtain mixed sugar alcohol liquid, Then chromatographically separate the xylitol fraction and the arabitol fraction, and then refine; this method glucose and galactose are removed and not utilized