New clean method for producing xylitol and arabinose

Abstract

The invention discloses a new clean method for producing xylitol and arabinose; the method originally utilizes xylose mother liquor as raw material, improves the fermentation process and the separation and purification process by pretreatment of the xylose mother liquor, fermentation, separation of fermented fluid thalli, fermentation pre-treatment, nanofiltration, concentration, chromatographic separation of a simulated moving bed, concentration and crystallization, and the like, shortens the fermentation time, lowers the production cost, greatly reduces the discharge amount of sewage, and increases the conversion rate of xylitol and the yield rate of arabinose; the purity of the xylitol and the arabinose which are obtained by utilizing the method can respectively reach more than 99.9 percent and 99 percent; and the yield rate of xylitol and arabinose is improved greatly, thereby creating an effective clean pollution-free industrial road for the production of xylitol and arabinose.

Description

technical field [0001] The invention discloses a new method for cleanly producing xylitol and arabinose. It is the first to utilize xylose mother liquor as a raw material, through pretreatment of xylose mother liquor, fermentation, ceramic membrane filtration, ultrafiltration, nanofiltration, and simulated moving bed chromatography. Separation, concentration and drying of the crystals. By improving the fermentation process and separation and purification process, the fermentation time is shortened, the production cost is reduced, the discharge of sewage is greatly reduced, the conversion rate of xylitol and the yield of arabinose are enhanced, and the xylitol obtained by the method of the present invention is The purity can reach more than 99.9%, the arabinose can reach 99%, and the yield of xylitol and arabinose has been greatly improved, creating an effective, clean and pollution-free industrialization road for the production of xylitol and arabinose. technical background ...

AI Technical Summary

Problems solved by technology

These methods all need to undergo hydrolysis, and the hydrolysis temperature is relatively high, and the pollution to the environment is relatively large. Since there are other monosaccharides besides the free L-arabinose from hydrolysis, it is difficult to separate by chromatography, and several steps of chromatography are required. Separation can separate L-arabinose from other monosaccharides, high production cost and low degree of automation

[0004] British patent GB2408262 is also a method for extracting L-arabinose from sugar beet pulp, which requires high alkali extraction. If the control is not proper, in addition to the extraction of arabinan, arabinoxylan and arabinogalactan will also be extracted Affect the purity of subsequent acid hydrolysis of L-arabinose

[0005] The above method consumes a lot of energy and pollutes a lot, and is not suitable for large-scale industrial production

[0006] Japan Unitika Co., Ltd. applied for Chinese invention patent CN01800804.6 and announced a method for treating arabinan, arabin-xylan and arabin-galactan with enzymes, but the method has high enzyme cost and The disadvantage of low efficiency of enzymatic hydrolysis, subsequent separation and purification is more difficult, and it is difficult for industrial production

[0007] Chinese patent CN101372700 describes a method for extracting L-arabinose from xylose mother liquor and biomass acid hydrolyzate, which mainly uses Debaria saccharomyces to ferment xylose mother liquor or hydrolyzate for cultivation to remove miscellaneous sugars, but ferment The process is difficult to control, and the polyols produced in the metabolic process are not accounted for, and arabinose can also be utilized, and the yield of arabinose is not high, only about 33%.

Using absolute ethanol to crystallize arabinose is costly and the operability of fermentation is not very strong. At the same time, a large amount of xylose is consumed in vain. Because it needs to undergo ion exchange and activated carbon decolorization, a large amount of waste water will be generated. The pollution problem is still not resolved

[0008] Chinese patent CN101367844 uses simulated moving bed chromatography to extract arabinose from gum arabic hydrolyzate, and arabinose is separated from other miscellaneous sugars such as galactose and glucuronic acid. However, the hydrolysis of gum arabic will cause pollution on the one hand and the other On the one hand, the price of gum arabic is relatively expensive, and the production of arabinose as a raw material will lead to an increase in production costs

[0009] Chinese Patent No. CN1107117C proposes to use the plant-derived fiber part obtained as a by-product in the production steps of various milling factories and starch factories as a raw material, mainly through dilute acid hydrolysis of corn kernel husk (corn bran), corn cob stem , and related plants for the production of arabinose, without any purification process involved

The yield of arabinose product is only 12%, the production cost is high, and it is also not suitable for industrialized production

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