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Method for preparing high-added-value sugar alcohols by efficiently using wood fiber raw materials

A lignocellulosic raw material, xylitol technology, applied in the field of high value-added sugar alcohols, can solve the problems of high cost of cellulose enzymatic hydrolysis, large amount of acid and alkali, complex process technology and other problems

Active Publication Date: 2014-04-02
BEIJING UNIV OF CHEM TECH
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  • Claims
  • Application Information

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Problems solved by technology

Although great progress has been made, large-scale industrial production is still not possible. There are two main problems: one is the high cost of fiber raw material pretreatment; the other is the high cost of cellulose enzymatic hydrolysis
However, the fermentation substrate xylose in existing patents is still mainly obtained by hydrolyzing hemicellulose with high-concentration sulfuric acid. Before fermentation, alkali neutralization, decolorization, and desalination are required. The process is complicated and the amount of acid and alkali is large.

Method used

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  • Method for preparing high-added-value sugar alcohols by efficiently using wood fiber raw materials
  • Method for preparing high-added-value sugar alcohols by efficiently using wood fiber raw materials

Examples

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preparation example

[0042] Take 1kg corncob (dry weight), add 5L, 1% oxalic acid to soak for 5h, and then filter with a plate and frame until the wet weight of corncob is 3kg. Put the wet material into the explosion chamber of the steam explosion machine, maintain the pressure in the high-pressure steam of 1.5MPa for 5 minutes, open the explosion valve and quickly spray the material into the cyclone separator to obtain steam-exploded corn cobs, with a wet weight of 5kg. Put it into an extraction tank, extract it with 10 L of water at 50°C for 1 hour, and pump the solid-liquid mixture into a plate-and-frame filter press for solid-liquid separation to obtain water extract A. According to HPLC analysis, the concentration of xylose in water extract A was 25.4g / L, the concentration of glucose was 1.6g / L, the concentration of arabinose was 2.1g / L, and the degradation rate of hemicellulose was 87.3%.

[0043] 2. Example of preparation of glucose solution

[0044] The wet weight of the remaining filter ...

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Abstract

The invention relates to a method for preparing high-added-value sugar alcohols by efficiently using wood fiber raw materials, belonging to the field of biological chemistry. The method comprises the following steps: after pre-processing the wood fiber raw materials, directionally decomposing hemicellulose components in the wood fiber raw materials by using a steam explosion technology, and performing solid-liquid separation to obtain solution rich in xylose; performing chemical treatment to residual solid residues, then decomposing the cellulose components in the residual solid residues by using the steam explosion technology, and performing solid-liquid separation to obtain the solution rich in glucose. The two kinds of sugary solution are respectively cleaned and concentrated, and processed by microbial fermentation, and fermenting liquor is separated, purified, concentrated and crystallize to obtain xylosic alcohol products and erythritol products. The method fully uses the components decomposed into sugars in the wood fiber raw materials and develops a new technology for converting the renewable wood fiber resources into the high-added-value sugar alcohols by using the steam explosion and bioconversion technology.

Description

technical field [0001] The invention belongs to the field of biochemical industry, and in particular relates to a method for converting renewable lignocellulosic resources into high value-added sugar alcohols by using steam explosion combined with biotransformation technology. Background technique [0002] Lignocellulosic raw material is an extremely abundant and cheap renewable resource in nature. It is mainly composed of three polymers: cellulose, hemicellulose and lignin, and also contains a small amount of pectin, gum and other components. The structure is very complex. Among them, cellulose is the main component of plant cell wall, mainly composed of 1000-10000 β-D-glucopyranose cross-linked by β-1,4-glycosidic bonds, and has multiple molecular layers arranged in parallel The filamentous insoluble microfibril structure is formed, and the basic unit is cellobiose. Hemicellulose is generally used as a molecular adhesive between cellulose and lignin. It is a branched poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/18C12R1/74C12R1/72C12R1/645C12R1/73
Inventor 袁其朋范晓光王显路王乐朱新涛
Owner BEIJING UNIV OF CHEM TECH