A kind of method for extracting crystal xylose from xylose mother liquor

Abstract

The invention relates to a method for extracting crystalline xylose from xylose mother liquor. Chromatographic separation; the separated feed liquid after chromatographic separation enters the chromatographic tank for temporary storage, and then performs secondary plate-and-frame filtration, secondary ion exchange, evaporation concentration, and cooling crystallization to obtain crystalline materials; the crystalline materials are centrifuged to obtain Crystallized xylose, a mother liquor and a washing liquid; the primary mother liquor is subjected to ultrafiltration and nanofiltration and then returned to the tank before chromatography to be reused; the washing liquid is subjected to ultrafiltration and nanofiltration and then returned to the tank after chromatography to be reused; The crystalline xylose is dried and packaged as the finished xylose. The invention divides the centrifugal mother liquor into a low-content primary mother liquor and a high-content washing liquid, and recycles them respectively, fully utilizes the high-content components in the centrifugal mother liquor, and improves the production line efficiency.

Description

technical field [0001] The invention belongs to the technical field of xylose mother liquor recycling, and particularly relates to a method for extracting crystalline xylose from xylose mother liquor. Background technique [0002] Because the content of xylose mother liquor is not enough for direct crystallization, it is often sold as a by-product. However, the purity of xylose mother liquor is usually above 40%. After re-purification, secondary crystallization can be carried out, and the finished xylose can be prepared by centrifugal separation. For example, the patent with the application number CN201811497387.0 discloses a method for preparing crystalline xylose by utilizing xylose mother liquor. The method uses high-purity ion exchange liquid and low-content centrifugal mother liquor to exchange each other, thereby improving the purity of xylose mother liquor. The purpose of this method, although this method reuses the xylose mother liquor, this technique needs a large ...

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Problems solved by technology

For example, the patent with the application number CN201811497387.0 discloses a method for preparing crystalline xylose by using xylose mother liquor. The method intermixes high-purity ion exchange liquid and low-content centrifugal mother liquor to improve the purity of xylose mother liquor. Although the method reuses the xylose mother liquor, the process requires a large amount of high-content ion exchange liquid to improve the purity, the process has relatively large limitations, and the mixing ratio of the xylose mother liquor and ion exchange capacity is relatively high. Not suitable for stable production

Another example is that the patent application number CN201110212228.3 discloses a method for producing D-xylose and L-arabinose by using xylose mother liquor, discloses a method for purifying xylose mother liquor by chromatography, and solves the problem of xylose The content of the mother liquor is low and difficult to crystallize, but the use of the centrifuged mother liquor is not considered. Since the content of the centrifuged mother liquor is higher than that of the raw xylose mother liquor, if it is directly returned to the raw material tank, it will easily lead to fluctuations in the raw material content and affect the stability of the chromatographic operation.

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