Xylose production and purification process

Abstract

The invention relates to a xylose production and purification process which belongs to the technical field of functional sugar production, and comprises the following steps that: (1) ion exchange is carried out to destaining solution in xylose production through an ion exchange column filled with gel-type anion exchange resin; (2) xylose solution after treatment in step (1) is beaten into a series column which comprises gel-type cation exchange resin and macroporous anion exchange resin; (3) the xylose solution after treatment in step (2) passes through a mixed bed exchange column which comprises anion and cation exchange resin; and (4) after treatment, a crystal xylose product is obtained through evaporation, concentration, centrifugation and drying procedures. The xylose production and purification process changes a traditional two-step purification into one-step purification, changes traditional step evaporation and concentration into centralized evaporation and concentration, simultaneously removes a one-step activated carbon decoloring procedure, simplifies the process, shortens the production cycle, reduces the production cost of xylose, adopts a mixed bed technology, ensures that the pH value of the exchange fluid to be 6.5 to 7.0, has lighter color after evaporation and concentration, and fully meets the requirements of xylose crystallization and separation.

Description

technical field [0001] The invention belongs to the technical field of functional sugar production and relates to a refining method for xylose production. Background technique [0002] The production of xylose products is based on agricultural waste such as corncobs, bagasse, cottonseed husks, etc., after pretreatment - hydrolysis - neutralization - decolorization - primary purification - primary evaporation concentration - secondary purification Purification - secondary evaporation concentration - crystallization - centrifugation - drying and other processes to produce white crystals, which produce a large number of impurity ions, pigments, colloids and other substances during the production process, seriously affecting the quality and quality of xylose production The improvement of the yield must be removed in the process. The traditional method of removing impurity ions, pigments, colloids and other substances is to use an ion exchange (cation resin-anion resin-cation res...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a purification and purification process for xylose production, to solve the complex process, many equipment, large amount of ion exchange resin, high acid-base consumption of resin regeneration, large waste water discharge, serious environmental pollution, etc. in the prior art. Problems such as large steam consumption, high cost, and long production cycle