System and method for producing crystallized xylose by using xylose mother liquor

Abstract

The invention relates to a system for producing crystallized xylose by using xylose mother liquor. The system comprises a raw material tank, a flocculation tank, a primary plate-and-frame filter, a primary ion exchanger, a membrane separator, a chromatographic column, a plate-and-frame filter front tank, a secondary plate-and-frame filter, a secondary ion exchanger, an evaporation tank, a crystallization cylinder, a centrifugal machine and a dryer which are sequentially communicated through pipelines. The invention also discloses a method for producing crystallized xylose by using the xylose mother liquor by using the system. The trapped fluid obtained through membrane separation treatment contains a xylan component, after the trapped fluid is subjected to enzyme hydrolysis treatment, an enzymatic hydrolysate and an extracting solution obtained through chromatographic separation are mixed before secondary filtration and impurity removal, reutilization of the xylan component in the xylose mother liquor is achieved, the utilization rate and utilization value of the xylose mother liquor are increased, and the yield of xylose is also improved.

Description

technical field [0001] The invention belongs to the technical field of xylose preparation, in particular to a system and method for producing crystallized xylose by using xylose mother liquor. Background technique [0002] Xylose mother liquor is a by-product of extracting xylose from corncob hydrolyzate. The purity of xylose in xylose mother liquor is usually 40%~50%. Since the xylose content is not enough for direct crystallization, it is often sold as a by-product with low price. . [0003] Xylose mother liquor can be used as raw material to produce crystallized xylose when the purity of xylose meets the requirement of crystallization through appropriate process, so as to realize high-value utilization. At present, there are many studies on the reuse of xylose mother liquor. For example, the patent application number 201110212228.3 discloses a method for producing D-xylose and L-arabinose by using xylose mother liquor. This method effectively solves the problem of the co...

AI Technical Summary

Problems solved by technology

The total amount of xylan accounts for 5%~10% of the total sugar ratio of the xylose mother liquor. After chromatographic separation, part of the xylan enters the production system with the extract, which increases the viscosity of the material, which not only affects the centrifuge yield and efficiency, but also Also increased unnecessary processing costs

The remaining xylan enters the by-products along with the chromatographic raffinate, and the added value is not fully utilized

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