Comprehensive utilization method of lignocellulose biomass

A technology of lignocellulose and biomass, which is applied in the field of comprehensive utilization of cellulose, hemicellulose and lignin in lignocellulosic biomass, can solve the problems of high furfural, relatively harsh pH requirements, and neglect of lignin extraction effect, etc. To achieve the effect of improving extraction rate and maximizing resource utilization

Active Publication Date: 2013-04-17
JINAN SHENGQUAN GROUP SHARE HLDG
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Problems solved by technology

The hemicellulose hydrolyzate is fermented to obtain 2,3-butanediol, the cellulose residue is fermented to obtain fuel ethanol, and the cellulose and hemicellulose are finally converted into industrial products for utilization, but the purpose of this process is to convert the Cellulose and hemicellulose are converted into fuel ethanol and 2,3-butanediol. The purpose of alkaline pretreatment is to remove lignin to the greatest extent, and lignin is used as a removal product, without considering the purity of lignin and other quality issues And the follow-up utilization of lignin, the alkali concentration is relatively high, and the activity of lignin is greatly damaged. Therefore, the separation of the three substances in this method ignores the extraction effect of lignin, and only cellulose and hemicellulose are tested. Effective industrial utilization, there is no guarantee that lignin can be effectively utilized industrially
[0007] The Chinese patent document with the publication number CN101725068A discloses a method and device for fractionating lignocellulosic biomass, providing lignocellulosic biomass, adding the first solvent capable of dissolving lignin, namely an alkaline solvent, from the obtained The above biomass extracts lignin, and then adds a second solvent that can dissolve hemicellulose, that is, an acidic solvent to extract xylose, and then extracts the cellulose remaining in the biomass; lignin, cellulose, and hemicellulose can all be separated. But when using dilute acid in this process, hemicellulose is not degraded into pentose, but exists in the form of oligomers; when using high-concentration acid, although the recovery rate of pentose is high, the amount of furfural generated is relatively small. High, therefore, the operation process has strict requirements on pH
At the same time, the concentration of lye used in the process of separating lignin is relatively high, and the activity of lignin is relatively large. The separated lignin can only be used as fuel for steam boilers or power plant boilers, or as phenolic chemicals through degradation treatment. low added value

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  • Comprehensive utilization method of lignocellulose biomass
  • Comprehensive utilization method of lignocellulose biomass
  • Comprehensive utilization method of lignocellulose biomass

Examples

Experimental program
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Effect test

Embodiment 1

[0067] (1) Alkali solution to extract alkali lignin

[0068] 10.65kg of corncobs (mass composition: moisture 6.12%, cellulose 35.19%, hemicellulose 32.01%, lignin 23.7%, other 2.95%, the same below) are pulverized and then mixed with alkali solution, wherein the volume of liquid and solid The ratio is 5: 1, the concentration of sodium hydroxide is 3%, then the temperature is raised to 70° C., after 1 hour of cooking and alkali hydrolysis, the alkali hydrolysis residue and alkali lignin solution are separated, and the alkali hydrolysis residue is washed with 10 kg of water. The cleaning solution is combined with the alkali lignin solution; 23.77kg of alkali hydrolysis residue (moisture content is about 65%) and 46.22kg of alkali lignin solution are finally obtained; after the alkali lignin solution is separated and concentrated by membrane equipment, add 10kg of water to dilute , Concentrate again, finally obtain 4.57kg of alkali lignin concentrate, and reclaim 51.65kg of alkal...

Embodiment 2

[0085] (1) Alkali solution to extract alkali lignin

[0086]Raw material and method are identical with embodiment 1 step (1), difference is, liquid-solid volume ratio is 20: 1, the concentration of sodium hydroxide is 0.8%, the temperature of alkali solution treatment is 100 ℃, and the time is 2 hours. Finally, 23.61kg of alkali hydrolysis residue (with a water content of about 65%) and 4.56kg of alkali lignin concentrate were obtained, and 201.79kg of alkali liquor was recovered. The solid content of the concentrated solution is 25.3%, the alkali lignin content of the concentrated solution is 23.8%, the residual alkali content of the concentrated solution is 0.7%, and the ash content of the concentrated solution is 1.5%. The content of is 0.63%, and the recovery rate of alkali is 80%. The extraction rate of alkali lignin is 43%.

[0087] (2) acid hydrolysis

[0088] Get all the alkali hydrolysis residues obtained by the alkali solution treatment in the present embodiment (...

Embodiment 3

[0096] (1) Alkali solution to extract alkali lignin

[0097] Raw material and method are identical with embodiment 1 step (1), and difference is, liquid-solid volume ratio is 10: 1, and the concentration of sodium hydroxide is 5%, and the temperature of alkaline solution treatment is 40 ℃, and the time is 6 hours. Finally, 24.44kg of alkali hydrolysis residue (with a water content of about 65%) and 4.2kg of alkali lignin concentrate were obtained, and 96.68kg of alkali liquor was recovered. The solid content of the concentrated solution is 25.7%, the alkali lignin content of the concentrated solution is 24.1%, the residual alkali content of the concentrated solution is 0.6%, and the ash content of the concentrated solution is 1.6%. The content is 4.34%, and the recovery rate of alkali is 84%. The extraction rate of alkali lignin is 40%.

[0098] Optionally, the obtained alkali lignin solution can be adjusted to pH 3 with 10% sulfuric acid, filtered, washed and dried to obtai...

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Abstract

A comprehensive utilization method of lignocellulose biomass comprises the following steps: (a) performing alkaline hydrolysis processing; (b) performing acid hydrolysis of the alkaline hydrolysis residues, separating to obtain a pentose solution and acid hydrolysis residues; (c) performing enzymatic hydrolysis of the acid hydrolysis residues by using cellulase to obtain a glucose solution and enzymatic hydrolysis residues; (d) returning the enzymatic hydrolysis residues to step (b) for acid hydrolysis, or combining the enzymatic hydrolysis residues with new alkaline hydrolysis residues and performing acid hydrolysis processing in step (b), then orderly performing steps (c) and (d), cycling the steps so as to further convert the hemicelluloses into pentose and to perform enzymatic hydrolysis of the celluose into glucose. The method realizes the maximum resource utilization of lignocellulose biomass.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing lignocellulosic biomass, in particular to a method for comprehensively utilizing cellulose, hemicellulose and lignin in lignocellulosic biomass. Background technique [0002] With the depletion of fossil fuel resources and the increasing environmental pollution, the use of renewable energy as a substitute for petrochemical products has become increasingly important. Fuel ethanol is the main form of biomass liquid energy and the most likely substitute for fossil fuels. At present, the world's ethanol production mainly uses starches (corn, cassava, etc.) and sugars (sugar cane, sugar beets, etc.) as raw materials for fermentation. The technology of producing ethanol by microbial fermentation is mature, but the high cost of raw materials restricts the industrial application of grain fermentation to produce ethanol. At the same time, there are disadvantages such as competition with people for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02C08H7/00C13K13/00C12R1/80
Inventor 唐一林江成真张恩选高绍丰韩文斌崔建丽马军强焦峰张茜刘洁
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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