Method for separating lignin and cellulose from lignocellulose raw material

A lignocellulose and cellulose technology, applied in the field of resources and the environment, can solve the problems of low lignin yield and product quality, and difficulty in obtaining high-purity cellulose and lignin at the same time, so as to improve utilization rate and value, Ease of industrialization promotion and the effect of improving the yield

Active Publication Date: 2019-12-06
WUHAN POLYTECHNIC UNIVERSITY
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  • Abstract
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Problems solved by technology

Among them, the use of acid-base method can obtain relatively high-purity cellulose, but the alkali has a certain destructive effect on the structure of lignin, resulting in low lignin yield and product quality; although the organic solvent method can simultaneously separate wood fiber However, the current research usually focuses on the separation of one of the components, mainly focusing on the extraction of cellulose or lignin, and it is difficult to obtain high-purity cellulose and lignin at the same time

Method used

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  • Method for separating lignin and cellulose from lignocellulose raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Pretreatment: Wash the wheat straw raw material, dry it, then pulverize it into powder, sieve it, add toluene-ethanol (2:1, v / v) mixed solvent, wherein, the weight volume of the raw material and the mixed solvent The ratio is 1:15 (g:mL). Then extract at 100° C. for 24 hours to obtain an extract, and vacuum-dry at 80° C. to obtain pretreated wheat straw powder, which is ready for use.

[0048] Separation of cellulose: Mix 10g wheat straw powder, 150mL 1,4-dioxane / water (volume ratio: 2:1) mixed solvent, then add sulfuric acid until the concentration of sulfuric acid in the mixture is 1.0wt%, and then add To the autoclave, stirred at 150 ° C for 6h. After the reaction kettle was cooled, the reaction slurry in the reaction kettle was filtered, and the obtained filter residue was washed 3 times with 25 mL of the above-mentioned mixed solvent, freeze-dried, and weighed to obtain cellulose, and the purity of the cellulose was 86.8%.

[0049] Separation of lignin: collect t...

Embodiment 2

[0051] Except that in the step of separating lignin, "supplementing sulfuric acid to a sulfuric acid concentration of 1.5 wt%" was changed to "supplementing sulfuric acid to a sulfuric acid concentration of 2.0 wt%", other steps were the same as in Example 1. After testing, the purity of the isolated cellulose is 86.8%; the purity of lignin is 89.2%, and the yield is 15.6%.

Embodiment 3

[0053] Except that in the step of separating lignin, "react at 180°C for 2.5h" was changed to "react at 180°C for 6h", other steps were the same as in Example 1. After detection, the purity of the isolated cellulose is 86.8%; the purity of lignin is 91%, and the yield is 16.1%.

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Abstract

The invention discloses a method for separating lignin and cellulose from a lignocellulose raw material, and relates to the technical field of high-value utilization of agricultural waste resources. The method for separating the lignin and the cellulose from the lignocellulose raw material includes the following steps: mixing the lignocellulosic raw material and a mixed solvent, adding sulfuric acid, performing stirring and heating at 130-160 DEG C until reaction slurry is formed, performing filtering after cooling, washing the filter residues by using the mixed solvent, and performing dryingto obtain the cellulose; and collecting the filtrate and the washing solution, mixing the collected filtrate and washing solution, adding sulfuric acid, after the concentration of the sulfuric acid is0.5-3.0 wt%, performing a reaction at 170-190 DEG C to form a reaction solution, after cooling, adding water for precipitation, performing filtration, washing the filter residues by using water, andperforming drying to obtain the lignin, wherein the mixed solvent is a mixture of an organic solvent and water. The invention aims to provide the method for separating the cellulose and the lignin, and the method can obtain the cellulose and the lignin with high purity, and improve the yield of the lignin.

Description

technical field [0001] The invention relates to the technical field of resources and the environment, in particular to the high-value utilization of agricultural waste resources, and in particular to a method for separating lignin and cellulose from lignocellulosic raw materials. Background technique [0002] With the rapid consumption of fossil fuels such as coal and oil and the gradual enhancement of people's awareness of environmental protection, the search for renewable and clean resources has become the focus of widespread attention in all countries in the world. Biomass resources have become a research hotspot due to their rich sources, fast regeneration speed, and low greenhouse gas emissions. Lignocellulosic biomass raw materials are the most abundant carbon-containing biomass resources in nature, mainly composed of cellulose (22-42%), hemicellulose (12-27%) and lignin (11-30%). These components can not only be converted into energy fuels and high value-added chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/04D21C3/20D21H11/12D21H11/00C07G1/00C08H7/00
CPCD21C3/04D21C3/20D21H11/12D21H11/00C07G1/00C08H6/00
Inventor 范国枝程群鹏宋光森李建芬杨志强吴祯祯
Owner WUHAN POLYTECHNIC UNIVERSITY
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