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Biorefinery method of wood fiber material

A technology of lignocellulosic raw materials and biorefining, which is applied in the fields of cellulose raw material pulping, lignin derivatives, fiber raw material treatment, etc., to achieve the effect of good cellulase enzymatic hydrolysis performance

Inactive Publication Date: 2009-10-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the biorefining process of lignocellulosic raw materials is the process of comprehensively utilizing its components and converting them into corresponding products based on their different properties. Biorefining method of lignocellulosic raw materials that reduces environmental pollution and combines pulping and papermaking with biomass pretreatment

Method used

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  • Biorefinery method of wood fiber material
  • Biorefinery method of wood fiber material
  • Biorefinery method of wood fiber material

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: 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 smaller size marrow cells, and the part whose particle size is larger than 40 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 Publishing House, 2003.), the bagasse components are analyzed by relevant measurement methods in the book, and the analysis results are: the bagasse Among them, 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%.

[0037] The liquid-solid ratio of the pretreatment lye and bagasse is 6:1, wherein the mass of sodium...

Embodiment 7

[0043]Embodiment 7: The lignocellulosic raw material used is the same as above. The liquid-solid ratio of the pretreatment lye and the bagasse is 3:1, wherein the mass of sodium hydroxide in the pretreatment lye is 10% of the mass of the bagasse. Put bagasse in a digester, add pretreatment lye and mix evenly, then raise the temperature to 90°C, and keep it warm for 1.5h. After the pretreated solid is washed with water, it is extruded to remove water until the water content is about 75%, and a peracetic acid solution having a quality equal to that of the initial bagasse is added, wherein the quality of the peracetic acid is 15% of the initial bagasse, After mixing evenly, raise the temperature to 75°C and keep it warm for 2h. The obtained pulp was washed and then dried. The solid yield of coarse pulp was 59.4%, the Kappa value was 2.8, the slurry ratio was 1.6%, the intrinsic viscosity of pulp was 940ml / g, and the ISO whiteness was 62.68%. The pulp is enzymatically hydrolyzed...

Embodiment 8

[0044] Embodiment 8: The lignocellulosic raw material used is the same as above. The bagasse is pre-impregnated with the black liquor obtained in the preceding examples, the concentration of residual alkali in the black liquor is 5 g / L, the liquid-solid ratio of the black liquor to bagasse is 3:1, and the pre-impregnation conditions are: temperature 60°C, time 1h . After pre-impregnation, the bagasse is placed in a digester for alkaline treatment. The liquid-solid ratio of the pretreatment lye and the initial bagasse is 1:1, wherein the mass of sodium hydroxide in the pretreatment lye is 11% of the mass of the bagasse. , add pretreatment lye and mix evenly, then raise the temperature to 90°C, and keep it warm for 1.5h. After the alkali-treated solid is washed with water, it is extruded to remove water until the water content is about 75%, and a peracetic acid solution having a quality equal to that of the initial bagasse is added, wherein the quality of the peracetic acid is...

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Abstract

The invention relates to a biorefinery method of wood fiber material, comprising the following steps of: (1) crushing and screening material so as to obtain long fiber, short fiber and powder; (2) adopting the two-step method of alkaline treatment and oxidation treatment to treat the long fiber obtained by the step (1) and preparing into pulp; and / or implementing synchronous diastatic fermentation on the short fiber and powder obtained by the step (1) and ultra-fine fiber and part of accepts obtained by the step (2) and preparing into alcohol. In the method, black liquid after alkaline treatment is prepared into alkali lignin; and the black liquid after oxidation treatment recovers the solvent and the oxidized lignin is prepared. The method can comprehensively utilize the wood fiber material to produce pulp, alcohol and lignin products. The obtained pulp has higher yield and better pulp performance compared with the sulfate pulp with the same material. The pulp can obtain higher enzymolysis rate with less usage of cellulose. The method has no sulfur and chloride elements, simultaneously reduces discharge of wastewater and has good environment friendliness.

Description

technical field [0001] The invention belongs to the fields of pulping, papermaking and biochemical industry, and in particular relates to a biorefining method of lignocellulosic raw materials, which uses lignocellulosic biomass as raw materials to co-produce products such as pulp, ethanol and lignin. technical background [0002] 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 tons of crop straw are produced every year, equivalent to 350 million tons of standard coal, more than 10 million tons of forest logging and processing residues, and more than 4 million tons of bagasse, but the cellulose resources used for industrial processes or combustion every year Only around 2%, there is still a large part that is not uti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/22D21C11/04D21C1/06C12P7/10C07G1/00C07C50/00C08H7/00
CPCY02E50/16Y02E50/10
Inventor 刘德华赵雪冰
Owner TSINGHUA UNIV
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