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

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...