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Biomass processing method

A biomass treatment and biomass raw material technology, applied in the direction of fermentation, etc., can solve the problems of delignification rate and enzymatic saccharification efficiency to be improved, and achieve the goal of improving enzymatic saccharification efficiency and chemical conversion rate, and improving accessibility Effect

Inactive Publication Date: 2018-11-06
TIANJIN UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

But at this stage, delignification rate and enzymatic saccharification efficiency still need to be improved

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] The plant fiber raw material is eucalyptus wood, and the total lignin content is 29.22%, the cellulose content is 70.11%, and the cellulose content is 47.86% by weight. The raw wood chips are pulverized by a micro pulverizer to get a component with a particle size of 0.3mm-0.45mm (40-60 mesh), and carry out ammonia pretreatment. The ammonia consumption is 50% (to absolute dry raw materials, by weight), and the pretreatment time is 2h, the pretreatment temperature is 90°C, the solid-to-liquid ratio (the mass ratio of water and raw materials) used is 1:6, and the pretreatment pressure in the reactor is 0.5MPa. The yield of the solid matrix obtained after pretreatment was 77.58%, the total lignin content was 14.29%, the total cellulose content was 83.59%, and the cellulose content was 60.05%. It is calculated that the lignin removal rate (formula 1) in the raw material during the pretreatment is 62.06%, and the loss rate of cellulose (the calculation method is the same as ...

Embodiment 2

[0029] The plant fiber raw material is wheat straw, and the total lignin content is 15.65%, the cellulose content is 78.69%, and the cellulose content is 42.69% by weight. The length of the raw material is 5-7cm after being pulverized by a pulverizer, and the ammonia water pretreatment is carried out. The ammonia consumption is 40% (to the absolute dry raw material, by weight), the pretreatment time is 8h, and the pretreatment temperature is 80°C. The ratio (mass ratio of water to raw materials) is 1:6, treated under normal pressure. The yield of the solid matrix obtained after pretreatment was 67.25%, the total lignin content was 8.03%, the total cellulose content was 83.59%, and the cellulose content was 62.05%. After calculation (the lignin removal rate, the cellulose loss rate and the calculation method of the cellulose enzymatic conversion rate in the solid matrix are all the same as in Example 1, the same below), the lignin removal rate in the raw material in the pretrea...

Embodiment 3

[0032] The plant fiber raw material is corn stalks, and the total lignin content is 21.73%, the cellulose content is 63.08%, and the cellulose content is 39.12% by weight. The length of raw wood chips is 1-10cm after being crushed by a crusher, and ammonia water pretreatment is carried out. The liquid ratio (mass ratio of water and raw materials) is 1:6, and it is treated at normal pressure. The yield of the solid matrix obtained after pretreatment was 62.03%, the total lignin content was 8.39%, the comprehensive cellulose content was 83.59%, and the cellulose content was 60.58%. After calculation (the lignin removal rate, the cellulose loss rate and the calculation method of the cellulose enzymatic conversion rate in the solid matrix are all the same as in Example 1, the same below), the lignin removal rate in the raw material in the pretreatment process is 76.05% %, the loss rate of cellulose is 3.94%. Carry out enzymatic hydrolysis and saccharification conversion to the s...

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Abstract

The invention provides a biomass processing method. Ammonia water is adopted in preprocessing of biomass raw materials for separating lignin from cellulose and hemicellulose, and a certain amount of environmentally-friendly auxiliary agents is added to increase the removal rate of the lignin and enhance the subsequent conversion efficiency of an obtained solid substrate. The preprocessed solid substrate is rich in the cellulose and the hemicellulose, and can be hydrolyzed to monosaccharides and used for the fermentation of ethyl alcohol and other products. A preprocessing liquid obtained by the method is rich in lignin degradation products and a small amount of hemicellulose degradation products, and the lignin degradation products and the hemicellulose degradation products can be recycledby acid precipitation, centrifugation or membrane separation and other techniques. Most of the ammonia water and the auxiliary agents used in the preprocessing are in the preprocessing liquid, can beseparated by waste steam recovery, reduced pressure distillation and other methods, and can be reused for biomass preprocessing. By adopting the preprocessing method, the preprocessing effect of theammonia water on biomass is obviously improved by the addition of the small amount of low-cost auxiliary agents, and the preprocessing method has a relatively good application prospect.

Description

technical field [0001] The invention relates to the technical field of ammonia water pretreatment, in particular to a biomass treatment method. Background technique [0002] In lignocellulose, cellulose is wrapped by lignin and hemicellulose, the combination of cellulose and hemicellulose and lignin molecules mainly depends on hydrogen bonding, and there are chemical bonds between hemicellulose and lignin to form Lignocarbohydrate complex (LCC), the structure of lignocellulose will affect the hydrolysis and saccharification of cellulose, making it difficult to directly degrade cellulose. Biomass pretreatment can destroy the dense structure between cellulose, hemicellulose and lignin, remove part or all of lignin at the same time, or change the physical and chemical structure of raw materials, such as reducing the crystallinity and polymerization degree of cellulose , Increase the porosity and specific surface area of ​​raw materials, so as to improve the efficiency and effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14
CPCC12P19/14C12P2201/00
Inventor 杨秋林王东升霍丹刘秋娟张凤山
Owner TIANJIN UNIV OF SCI & TECH
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