Pretreatment method of wood fiber raw materials

A lignocellulosic raw material and pretreatment technology, which is applied in the direction of pretreatment with acidic compounds, can solve the problems of no thermoplastic performance, limited industrial application, wide molecular weight distribution, etc., and achieve the effect of reducing waste water discharge, high added value, and high purity

Inactive Publication Date: 2010-10-20
TSINGHUA UNIV
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Problems solved by technology

However, these lignins contain sulfur and have low purity, complex components, wide molecular weight distribution, low viscosity, high dispersion, poor processing performance, and almost no thermoplastic properties, which greatly limit their industrial applications (Luo Xuegang. High-purity wood Extraction and thermoplastic modification. Beijing: Chemical Industry Press, 2008)

Method used

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  • Pretreatment method of wood fiber raw materials
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  • Pretreatment method of wood fiber raw materials

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Experimental program
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Embodiment 1

[0029] The lignocellulosic raw material used is bagasse, and the place of origin is Nanning, Guangxi. The bagasse is air-dried and sieved to remove the small-sized marrow cells, and the part whose particle size is larger than 60 mesh sieve aperture is selected as the raw material. With reference to "Pulp and Paper Analysis and Detection" (Shi Shulan. Pulp and Paper Analysis and Detection. Beijing: China Light Industry Press, 2003.), the bagasse components are analyzed with reference to the relevant measurement method, and the analysis results are: in the bagasse, The ash content is 1.38%, the hot water extract is 5.16%, the 1% NaOH extract is 34.20%, the benzene-alcohol extract is 3.17%, the cellulose content is 44.98%, and the cellulose content is 76.76%. The acid-insoluble lignin content is 18.45%, and the acid-soluble lignin content is 1.80%.

[0030]In the formic acid solution with a mass fraction of 68%, add sulfuric acid with a mass fraction of 0.2% as a catalyst, mix i...

Embodiment 2

[0032] The lignocellulosic raw material used is the same as embodiment 1.

[0033] In the formic acid solution with a mass fraction of 78%, add sulfuric acid with a mass fraction of 0.1% as a catalyst, mix it with bagasse at a liquid-solid ratio of 8:1, and then stir and treat it at normal pressure boiling point (about 105° C.) for 1.5 hours. After cooling and centrifuging to remove the black liquor, use a formic acid solution with a mass fraction of 78% to wash the resulting cellulose solid in a ratio of 8:1 with the initial bagasse liquid-solid ratio. After removing the washing black liquor by centrifugation, wash the solid with clear water to neutral , placed at 105 ° C and dried. The solid yield of the obtained cellulose is 49.2%, the content of glucan is 83.8%, the content of xylan is 7.53%, the content of lignin is 15.65%, and the content of formyl is 4.08%. This cellulose solid adopts the cellulase of 20FPU / gDS (absolutely dry substrate) and the β-glucosidase enzyme hy...

Embodiment 3

[0035] The lignocellulosic raw material used is the same as embodiment 1.

[0036] Add sulfuric acid with a mass fraction of 0.3% as a catalyst in an acetic acid solution with a mass fraction of 70%, mix it with bagasse at a liquid-solid ratio of 10:1, stir and treat it at the boiling point at normal pressure for 3.0 hours, cool and centrifuge to remove black Wash the obtained cellulose solid with 70% acetic acid solution with a mass fraction of 70% according to the liquid-solid ratio of the initial bagasse in a ratio of 10:1, centrifuge to remove the washing black liquor, wash the solid with water to neutrality, and place it at 105°C Tumble dry. The solid yield of the obtained cellulose is 52.4%, the content of glucan is 65.78%, the content of xylan is 15.10%, the content of lignin is 12.61%, and the content of acetyl group is 2.67%. This cellulose solid adopts the cellulase of 20FPU / gDS (absolutely dry base) and the β-glucosidase enzyme hydrolysis of 40CBU / gDS to hydrolyze ...

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Abstract

The invention relates to a pretreatment method of wood fiber raw materials, which belongs to the technical field of biomass chemical engineering. The process comprises the following steps: carrying out the first-step treatment after the wood fiber raw materials are mixed with mixed liquid of an organic acid solution and catalysts to obtain a liquid-solid mixture; separating the obtained liquid-solid mixture to obtain pretreatment black liquid and cellulose solids; washing the obtained cellulose solids by the organic acid solution to obtain washing black liquid and cellulose solids; adopting diluted acid or alkali for carrying out the second-step treatment on the obtained cellulose solids; mixing the obtained pretreatment black liquid and the obtained black liquid to obtain mixed black liquid; circularly using the mixed black liquid in the first-step treatment process; and recovering organic acids, lignin products and syrup solutions from the black liquid in the cyclic use for at least three times. The invention has the advantages that the full-rate development of raw materials can be realized, in addition, the environment-friendly effect can be realized, and the invention conforms to the requirement of modern biorefinery development.

Description

technical field [0001] The invention belongs to the field of biomass chemical industry, and in particular relates to a pretreatment method for lignocellulosic raw materials, which can improve the efficiency of catalyzed hydrolysis of lignocellulosic raw materials by cellulase, and can realize the coproduction of high-purity lignin, ethanol and hemicellulose products. Background technique [0002] In recent years, due to the increasingly severe energy shortage and environmental damage, the development of fuel ethanol, especially non-grain ethanol, such as cellulosic ethanol, has attracted the attention of countries all over the world as an alternative energy source. Lignocellulosic raw materials are the most abundant organic matter in nature. It is estimated that plants produce 150-200 billion tons of dry matter through photosynthesis every year, which is the only physical resource on the earth that can be regenerated on a large scale. In my country, more than 700 million to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C1/04
Inventor 赵雪冰刘德华
Owner TSINGHUA UNIV
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