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Method for co-producing high-concentration xylose and xylooligosaccharide by utilizing wood fiber raw materials

A technology of lignocellulosic raw materials and xylooligosaccharides, applied in sugar production, xylose production, application, etc., can solve the problems of low purity and low concentration of hemicellulose-derived sugars, and achieve the effect of simple separation

Active Publication Date: 2016-08-31
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for co-producing xylose and xylooligosaccharides by using lignocellulosic raw materials, which solves the problem of excessive decomposition of xylan by the direct hydrolysis of hemicellulose to generate by-products such as furfural and formic acid, resulting in the obtained wood Low concentration and low purity of hemicellulose-derived sugars such as sugars and xylo-oligosaccharides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: preparation technology of furfural / water mixture

[0022] Harvest and dry sweet sorghum stalks as raw materials, crush them to 14-20 mesh, put them into the high-pressure reactor mentioned in the patent CN201077823 "Cellulosic Biomass Hydrolysis Device", according to the solid-liquid mass ratio of 1 : 5 Add furfural / water mixed solution with a volume fraction of 90%, close the reaction system, heat to 175-185°C, stir at 500rpm, hydrolyze for 70min under saturated vapor pressure conditions, and the material hemicellulose branched chain acetyl group in the reaction Acetic acid is generated when the agglomerate falls off, and the acidic environment catalyzes the cleavage of hemicellulose glycosidic bonds, and furfural participates in coupling hydrolysis. After the reaction, the reactants are collected and centrifuged. Sugar and xylo-oligosaccharide) mass concentration is 129.9g / L, yield is 80.8% (accounting for the mass content of total xylose in unhydrolyzed...

Embodiment 2

[0023] Embodiment 2: preparation technology of furfural / dilute formic acid mixed solution

[0024] Use bagasse as raw material, crush it to 10-20 mesh, put it into the high-pressure reactor mentioned in the patent CN201077823 "Cellulosic Biomass Hydrolysis Device", add the volume fraction according to the solid-liquid mass ratio of 1:8 50% furfural / dilute formic acid (dilute formic acid volume concentration is 0.01%) mixed solution, closed reaction system, heated to 155-165°C, stirring at 500rpm, hydrolyzed for 50min under saturated vapor pressure conditions, the acetyl group in the reaction The shedding produces acetic acid and formic acid to act together to catalyze the hydrolysis of hemicellulose, and furfural participates in synergy. After the reaction, the reactants are collected and centrifuged. Xylan) mass concentration is 60.3g / L, yield is 85.4% (accounting for the content of total xylose in unhydrolyzed raw materials), wherein xylose accounts for 65.2% of the quality ...

Embodiment 3

[0025] Embodiment 3: preparation technology of furfural / dilute formic acid mixed solution

[0026] Use hybrid Pennisetum as raw material, crush it to 5-10 mesh, put it into the autoclave mentioned in the patent CN201077823 "Cellulosic Biomass Hydrolysis Device", add it according to the solid-liquid mass ratio of 1:10 Furfural / dilute formic acid (0.1% volume concentration of dilute formic acid) mixed solution with a volume fraction of 33.3%, closed reaction system, heated to 145-155°C, stirring at 500rpm, hydrolyzed for 30min under saturated vapor pressure conditions, the acetyl The groups fall off to generate acetic acid and formic acid to catalyze the hydrolysis of hemicellulose, and furfural participates in synergy. After the reaction, the reactants are collected and centrifuged, and the supernatant water phase is analyzed by high-performance liquid chromatography. and xylo-oligosaccharide) mass concentration is 45.6g / L, yield is 84.3% (accounting for the content of total xy...

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Abstract

The invention discloses a method for co-producing high-concentration xylose and xylooligosaccharide by utilizing wood fiber raw materials. The method comprises the following steps: crushing wood fiber biomass and directly adding the crushed wood fiber biomass into a high-pressure reaction kettle, adding a furaldehyde / water mixed liquor with volume concentration being 10%-90%, carrying out solid-liquid separation on a reacted product, taking a supernatant water phase to further refine to obtain xylose and xylooligosaccharide; and distilling a non-water-phase part under reduced pressure for recycling furfural for cycle use. According to the method, by virtue of inhibiting and extracting effects of furaldehyde, wood fiber raw materials are hydrolyzed in a furfural two-phase system to prepare hemicellulose derived carbohydrate such as xylose and xylooligosaccharide, so that the concentration and the purity of the hemicellulose derived carbohydrate such as xylose and xylooligosaccharide are improved, and the problems of low concentration and low purity of hemicellulose derived carbohydrate such as xylose and xylooligosaccharide due to the fact that byproducts such as furaldehyde and formic acid are generated by excessively decomposing xylan by a hemicelluloses direct hydrolysis method are solved.

Description

Technical field: [0001] The invention relates to the field of biomass biochemical conversion, in particular to a method for co-producing xylose and xylooligosaccharides by utilizing lignocellulosic raw materials. Background technique: [0002] Hemicellulose is an amorphous biopolymer, mainly found in lignocellulosic biomass such as poplar, eucalyptus, pine, corn cob, corn stalk, wheat stalk, rice stalk, etc. and so on to form a cell wall network structure. Hemicellulose is composed of a variety of sugar groups, including D-xylose, L-arabinose, D-glucose, D-galactose, D-mannose, D-glucuronic acid, 4-O-methyl-D- Glucuronic acid, D-galacturonic acid, D-glucuronic acid and a small amount of L-rhamnose, L-trehalose and various O-methylated neutral sugars, the chemical composition of which varies with the type of woody biological resources varies with each other. Hemicellulose is hydrolyzed to obtain sugar products such as oligosaccharides and monosaccharides, which can be ferm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
CPCC13K13/002
Inventor 袁振宏余强庄新姝卞士祥王琼亓伟王闻谭雪松周桂雄
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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