Novel production technique of xylose

Abstract

The invention discloses a new manufacturing technique of a xylose and relates to a technique for manufacturing the xylose. The technique adopts the technology of electrodialysis recycling sulphuric acid, a bag adopted by a nanofiltration concentration device and a special nanofiltration separation system concentrates the liquid in the technique for manufacturing the xylose at normal temperature, therefore water and other impurities can be removed from the product; the manufacturing technique comprises: 1. pretreatment, 2. hydrolyzation, 3. decoloration, 4. electrodialysis, 5. ion exchange, 6. nanofiltration, 7. concentration, 8. ferment, 9. crystallization, 10. centrifugation, and 11. drying, then the high purity xylose is obtained. The new manufacturing technique of the xylose can not only recycle 50 percent sulphuric acid in the hydrolyze liquid, but also can recycle waste acid and spent caustic produced in the regenerative process of duolite, therefore the dosage of sulphuric acid can be saved and the environment pollution is avoided. The technique solves the problems of scale formation in device in the neutralizing deacidification technique, large usage of duolite in deacidification technique, large usage of devices, large investment, large consumption of acid and alkali, high costs and the like; thus improving the device utilization rate and the service life, decreasing the ash and the acid contents in the hydrolyze liquid, improving the quality of the hydrolyze liquid and enhancing the product quality and separating efficiency.

Description

technical field [0001] The invention relates to a process for producing xylose. Background technique [0002] At present, the preparation methods of xylose mainly include neutralization deacidification process and ion exchange deacidification process. [0003] Neutralization deacidification process to prepare xylose The process route of neutralization method to prepare xylose is: raw material (i.e. agricultural fiber waste), successively undergoes raw material pretreatment, hydrolysis, neutralization, decolorization, ion exchange, concentration, crystallization, and final separation Xylose crystals are obtained. Due to the gypsum (CaSO 4 ) Eventually, a part of gypsum will be deposited on the tube wall of the evaporator, forming a heat insulation layer, reducing the evaporation efficiency, wasting steam, and reducing the utilization rate of the equipment. Because this layer of scaling is difficult to remove, especially difficult to remove by chemical methods, it is not on...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a new xylose production process to solve the problem that the prior art is easy to form a heat insulation layer, reduces evaporation efficiency, and wastes Steam, reducing equipment utilization, complex process, more ion exchange resin consumption, more equipment, large investment, increased acid and alkali consumption, increased cost, serious pollution and other issues