Method for producing xylose by use of xylose mother liquid

Abstract

The invention provides a method for producing xylose by use of xylose mother liquid, which comprises the following steps of: adding a certain amount of ion exchange liquid into the xylose mother liquid in xylose production to adjust the concentration of the dry matter of xylose liquid to 10-30%; enabling the mixed xylose liquid to pass through a filter membrane for intercepting 0.1-0.5kD molecular weight to intercept polysaccharide in the mixed xylose liquid and keep small-molecular monosaccharide in the filtrate; processing with a cation exchange column and an anion exchange column so as to control the content of cations and anions in the filtrate below 10ppm; and concentrating and crystallizing to obtain a finished product of xylose. By adding ion exchange liquid into the xylose mother liquid which is hard to crystallize, the purity of xylose in the xylose liquid is improved; the pigment and polysaccharide in the mixed xylose liquid are removed by membrane separation of a filter membrane, and the xylose liquid after the membrane filtration is concentrated; and since the polysaccharide component in the xylose liquid is removed, the xylose mother liquid hard to crystallize is crystallized and purified, the total crystallization rate of xylose is improved by about more than 10%, and the xylose production cost is greatly reduced.

Description

technical field [0001] The invention relates to a production method of xylose, in particular to a method for producing high-purity xylose by using xylose mother liquor. Background technique [0002] Xylose is a sweetener, mainly used in the field of food processing. The current domestic xylose production process is to obtain xylose liquid under acid hydrolysis conditions from corncobs or bagasse, and then obtain crystallized xylose after purification. Because the xylose mother liquor has high miscellaneous sugar content and low xylose purity, it is difficult to purify the xylose crystals in the mother liquor. In the end, most of the xylose mother liquor is used as a pigment raw material, which wastes resources. Generally speaking, the treatment of xylose mother liquor includes two methods. One method is to use chromatographic separation to purify arabinose and xylose, but the cost of chromatographic separation is high. Difficult to handle, resulting in high cost of purified...

AI Technical Summary

Problems solved by technology

[0002] Xylose is a sweetener, mainly used in the field of food processing. The current domestic xylose production process is to obtain xylose liquid under acid hydrolysis conditions from corncobs or bagasse, and then obtain crystallized xylose after purification. The xylose mother liquor has high miscellaneous sugar content and low xylose purity, so it is difficult to purify the xylose crystals in the mother liquor. In the end, most of the xylose mother liquor is used as a pigment raw material, wasting resources

Generally speaking, the treatment of xylose mother liquor includes two methods. One method is to use chromatographic separation to purify arabinose and xylose, but the cost of chromatographic separation is high. Difficult to handle, resulting in high cost of purified xylose; another method is to use fermentation to ferment the glucose in the mother liquor into alcohol with yeast, and then purify the xylose in the feed liquid into crystalline xylose. High, difficult to promote and apply in production