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Method for extracting lignin, cellulose and sugar by deconstructing corn straw lignocellulose

A technology for lignocellulose and corn stalk, which is applied in the fields of fiber raw material processing, chemical instruments and methods, oligosaccharides, etc., can solve the problems of reducing sugar yield, long processing time, and ignoring the influence of hemicellulose hydrolysis rate. , to achieve the effect of simple process, reduction of by-products, and efficient deconstruction

Pending Publication Date: 2022-03-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The maximum yield of lignin in this process is 81.6%, but the influence of the process on cellulose yield and hemicellulose hydrolysis rate is not considered
[0005] On the one hand, the traditional lignocellulose deconstruction technology is difficult to change the damage to the structure of cellulose and lignin caused by high temperature treatment;
Therefore, the lignin-targeted treatment technology usually uses high temperature and high pressure. This treatment condition is difficult to avoid the loss of carbohydrates due to degradation, reducing the utilization efficiency of cellulose and the purity of the product.
However, cellulose and hemicellulose-targeted treatment technologies usually use harsh treatment conditions such as high temperature and high acid, and the process environment is difficult to control the side reactions of sugar degradation, which reduces the yield of sugar, and at the same time leads to β-O-4 in lignin that is easy to break. Bonds condense into hard-to-break C-C bonds, which increases the difficulty of lignin depolymerization and further restricts the efficient utilization of lignocellulosic biomass

Method used

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  • Method for extracting lignin, cellulose and sugar by deconstructing corn straw lignocellulose
  • Method for extracting lignin, cellulose and sugar by deconstructing corn straw lignocellulose
  • Method for extracting lignin, cellulose and sugar by deconstructing corn straw lignocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In the pressure tube, add 1 mass part of dry corn stalk wood powder, 14 volume parts of a mixed solution of formic acid solution with a mass concentration of 80 wt % and a hydrochloric acid solution with a mass concentration of 0.3 wt %. React for 100 min under normal pressure at 80°C. Cool to room temperature after the reaction, use formic acid to pickle and filter the reaction solution, and separate to obtain cellulose solid and black liquor. Collect the black liquor and carry out rotary evaporation, the rotary evaporation temperature is 57°C, and the rotary evaporation time is 15min. The evaporated organic acid liquid is recovered and recycled, and 30 volume ratio water is added to the concentrated black liquor, fully mixed and dissolved, and then filtered to obtain lignin solid and sugar liquid.

[0040] Take 2 volumes of sugar solution and add 8 volumes of sulfuric acid solution with a mass fraction of 5 wt%, mix them, put them in a constant temperature water bath...

Embodiment 2

[0042] In the pressure pipe, add 1 mass part of dry corn stalk wood powder, 14 volume parts of a mixed solution of formic acid solution with a mass concentration of 60 wt % and a hydrochloric acid solution with a mass concentration of 0.3 wt %. React for 60 minutes under normal pressure at 80°C. Cool to room temperature after the reaction, use formic acid to pickle and filter the reaction solution, and separate to obtain cellulose solid and black liquor. Collect the black liquor and carry out rotary evaporation, the rotary evaporation temperature is 57°C, and the rotary evaporation time is 20min. The evaporated organic acid liquid is recovered and recycled, and 30 volume ratio water is added to the concentrated black liquor, fully mixed and dissolved, and then filtered to obtain lignin solid and sugar liquid.

[0043] Take 2 volumes of sugar solution and add 8 volumes of sulfuric acid solution with a mass fraction of 5 wt%, mix them, put them in a constant temperature water b...

Embodiment 3

[0045] In the pressure pipe, add 1 mass part of dry corn stalk wood powder, 14 volume parts of a mixed solution of formic acid solution with a mass concentration of 80 wt % and a phosphoric acid solution with a mass concentration of 0.3 wt %. React for 80 minutes under normal pressure at 80°C. Cool to room temperature after the reaction, use formic acid to pickle and filter the reaction solution, and separate to obtain cellulose solid and black liquor. Collect the black liquor and carry out rotary evaporation, the rotary evaporation temperature is 56°C, and the rotary evaporation time is 20min. The evaporated organic acid liquid is recovered and recycled, and 30 volume ratio water is added to the concentrated black liquor, fully mixed and dissolved, and then filtered to obtain lignin solid and sugar liquid.

[0046] Take 2 volumes of sugar solution and add 8 volumes of sulfuric acid solution with a mass fraction of 5 wt%, mix them, put them in a constant temperature water bat...

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Abstract

The invention belongs to the technical field of corn straw lignocellulose deconstruction, and provides a method for extracting lignin, cellulose and oligosaccharide from lignocellulose by using organic acid. The method comprises the following steps: uniformly mixing wood flour with an acid solution and a catalyst, heating for reaction, pickling, filtering and separating to obtain a cellulose solid and a black liquor, carrying out rotary evaporation on the separated black liquor, and adding water for fully dissolving to obtain a lignin solid and a sugar solution. The functional structures of the lignin and the cellulose are completely reserved under the low-temperature condition, meanwhile, the hemicellulose is converted into the xylooligosaccharide with high utilization value, and further processing and utilization of the lignin and the cellulose are facilitated. According to the method, the lignin extraction rate can reach 93.90%, the cellulose loss rate can reach 0.58%, the hemicellulose conversion rate can reach 92.55%, the xylooligosaccharide yield can reach 66.70%, the xylose yield can reach 17.83%, and three-component comprehensive utilization of lignocellulose can be achieved.

Description

technical field [0001] The invention relates to the field of lignocellulose deconstruction, in particular to a method for deconstructing corn stalk lignocellulose to extract lignin, cellulose and sugar. Background technique [0002] As a large agricultural country, my country has very rich agricultural and forestry biomass resources. According to statistics, my country's annual crop straw output is about 850 million tons, and forest biomass output is about 800 to 1 billion tons. The development of agricultural and forestry wastes, wood processing wastes, food industry residues and other biomass resources with high potential utilization value Research on fuels, chemicals and materials has received a lot of attention. Lignocellulose consists primarily of organized tangles of cellulose, hemicellulose, and lignin. Cellulose and hemicellulose are usually polysaccharides composed of glucose and xylose units, and lignin is a kind of three phenylpropanes composed of p-hydroxypropyl...

Claims

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Application Information

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IPC IPC(8): C08H7/00C07H1/00C07H3/06D21C5/00
CPCC08H6/00C07H1/00C07H3/06D21C5/00
Inventor 欧阳新平李灿欣樊荻谢心怡周良刘启予邱学青钱勇阮涛
Owner SOUTH CHINA UNIV OF TECH