A clean and efficient production process for preparing xylose and l-arabinose

Abstract

The invention relates to a clean and high-efficiency production process for preparing xylose and L-arabinose and belongs to the field of application of wastes of agriculture and forestry. The production process comprises the following steps of: performing pretreatment on raw materials; hydrolyzing the raw materials in a high-temperature cooking mode; performing neutralizing treatment and performing centrifugal separation on solid slag to obtain xylose or xylooligosaccharide hydrolyzate; adding coarse enzyme solution into xylooligosaccharide solution to hydrolyze to obtain xylose solution; treating the hydrolyzate by Angle yeast; purifying by using active carbon and resin; performing recompression and concentration treatment on the purified hydrolyzate by using a mechanical vapor recompression (MVR) machine; crystallizing the concentrated solution in a gradient program cooling mode to obtain xylose products and xylose mother solution; separating the xylose mother solution by a simulated moving bed or a chromatographic separation technology to obtain a xylose phase and an L-arabinose phase; returning the xylose phase to the xylose solution to concentrate and recrystallize; reusing the xylose mother solution; performing MOVR concentration treatment on the L-arabinose phase and crystallizing in a gradient program cooling mode to obtain L-arabinose products; and reusing the L-arabinose mother solution.

Description

technical field [0001] The invention relates to a process for cleanly producing xylose and L-arabinose by using raw materials such as agricultural and forestry wastes, especially the process of processing agricultural and forestry wastes such as cottonseed hulls to obtain xylose hydrolyzate by microorganisms after pretreatment of the raw materials. Crystallization to obtain xylose crystals after removal of miscellaneous sugars and purification treatment, and crystallization of xylose mother liquor to obtain xylose and L-arabinose crystals after simulated moving bed separation. Background technique [0002] The products obtained from photosynthesis on the earth are as high as nearly 200 billion tons every year, which is the only available resource on the earth that can be regenerated on a large scale. Lignocellulose, which accounts for the majority of plant biomass, is the most abundant and cheapest renewable resource in the world, of which less than 12% is utilized by people...

AI Technical Summary

Problems solved by technology

In recent years, there have been some reports of using yeast fermentation to treat glucose in xylose mother liquor, and then using simulated moving bed to separate xylose from L-arabinose to obtain high value-added monosaccharides. If it is too large, it will have a greater impact on the growth of bacteria and the removal of glucose, which will result in the need to dilute the mother liquor in a large amount during the fermentation process, which will increase the processing load

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