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Post-treatment method for strengthening pretreatment effect of lignocellulose raw material through pulping

A lignocellulosic and pretreatment technology, applied in biofuel, waste fuel, fermentation, etc., can solve the problems of high energy consumption, limited promotion and application of pretreatment methods, high pretreatment intensity, etc., to increase specific surface area, shorten enzyme The effect of shortening the solution reaction time and improving the conversion rate

Inactive Publication Date: 2014-06-11
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

However, the pretreatment intensity is too high, the energy consumption is too large, and the production of a large number of compounds that strongly inhibit subsequent enzymolysis and fermentation during the pretreatment process greatly limits the promotion and application of these pretreatment methods.

Method used

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  • Post-treatment method for strengthening pretreatment effect of lignocellulose raw material through pulping

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Effect test

Embodiment 1

[0026] After dewatering the industrial residue of corncobs by pressing, directly add tap water to adjust its solid content to 5% (w / w), perform a refining treatment on a disk mill for 1 minute, and obtain a particle size distribution of 0.05-0.15mm of lignocellulose pulp. Put the refined slurry into an Erlenmeyer flask, add cellulase (Shanghai Youtel Biochemical Co., Ltd.), the enzyme amount is 15FPU / g dry material, and enzymatically hydrolyze at 50°C, pH 5.5, and 150rpm for 6h , the conversion rate of cellulose can reach 70.41%. The unrefined industrial residue of corncobs is enzymatically hydrolyzed under the same conditions, and the conversion rate of cellulose is only 53.93%.

Embodiment 2

[0028] Coarsely pulverize the air-dried corn stalks, remove sand, dust and other impurities, place them in a pretreatment reactor, and dry lignocellulose at 160°C, 0.5MPa, and dilute sulfuric acid concentration of 1% (w / w). Under the condition that the mass ratio of solid to dilute acid is 1:1, dilute sulfuric acid pretreatment is carried out for 15 minutes, and the equipment used for the treatment is a reactor. Add water to the pretreated straw raw material, adjust its solid content to 20% (w / w), and perform a refining treatment on a disc refiner for 5 minutes to obtain a lignocellulose slurry with a particle size of 0.01-0.08mm . Put the refined straw slurry into an Erlenmeyer flask, add tap water to adjust the solid content to 5% (w / w), and add cellulase (Shanghai Youtel Biochemical Co., Ltd.), the enzyme amount is 15 FPU / g dry The material is enzymatically hydrolyzed for 72 hours at 50°C, pH 4.8, and 150 rpm, and the conversion rate of cellulose can reach 82.79%. The con...

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Abstract

The invention relates to a post-treatment method for strengthening the pretreatment effect of lignocellulose raw material through pulping. The post-treatment method comprises the following steps: (1) subjecting a lignocellulose raw material to a preliminary treatment; (2) subjecting the lignocellulose raw material obtained in the step (1) to a pretreatment; (3) adjusting the solid content of the lignocellulose raw material obtained in the step (2), then subjecting the lignocellulose raw material to a pulping treatment in a pulping machine; (4) subjected the lignocellulose pulp obtained in the step (3) to an enzymatic hydrolysis treatment and a bioprocess treatment. The post-treatment method has the following advantages: the lignocellulose, which has been subjected to a pretreatment, is pulped; thus the particle size of the lignocellulose raw material is decreased, so the contact surface between the lignocellulose and enzyme in the enzymatic hydrolysis process is enlarged, the enzymolysis speed and efficiency are promoted, the pretreatment effect of the lignocellulose raw material is strengthened, the energy consumption and cost of the pretreatment is reduced, moreover, the pulped lignocellulose has a good fluidized property, thus the processing efficiency is improved, and the risk that the raw material is infected by bacterium after the pretreatment is reduced too.

Description

【Technical field】 [0001] The invention relates to the fields of biorefining and bioenergy, in particular to a post-refining treatment method for enhancing the pretreatment effect of lignocellulosic raw materials. 【Background technique】 [0002] Lignocellulosic feedstock is one of the most abundant renewable resources in the world, and its structure is complex, mainly composed of cellulose, hemicellulose and lignin, among which cellulose and hemicellulose can be used to use sugar as a platform by hydrolysis biorefinery process. However, cellulose is tightly packed by a covalently bonded network of hemicellulose and lignin, resulting in a stubborn and dense structure. Therefore, before the biotransformation of lignocellulosic raw materials, it must be pretreated to break the network structure of hemicellulose and lignin to expose the cellulose, further reduce the degree of polymerization and crystallinity of cellulose, and improve the enzyme activity of cellulose. Accessibil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P7/10C12P5/02C12P7/64
CPCY02E50/10Y02E50/30
Inventor 张建顾翰琦鲍杰
Owner EAST CHINA UNIV OF SCI & TECH
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