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Method for extracting highly active lignin from biomass and lignin obtained therefrom

A lignin and high-activity technology, applied in the direction of lignin derivatives, chemical instruments and methods, organic chemistry, etc., can solve the problems of expensive treatment costs, severe pretreatment conditions, and undetectability, and achieve recovery and recycling , Improve evaporation efficiency, promote the effect of enzymatic hydrolysis efficiency

Active Publication Date: 2018-10-02
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its pretreatment conditions are relatively severe, and the addition of acid catalysts makes the aryl ether bond content of this type of lignin very low or even undetectable, and forms a condensation structure during degradation, making the high value of this type of lignin There are also certain obstacles to the utilization of
[0006] In addition, ionic liquid pretreatment method has been studied more. The lignin structure obtained by ionic liquid pretreatment is relatively complete, but its expensive treatment cost makes its research only stay in the laboratory stage; in addition, recent studies have shown that isopropyl Alcohol pretreatment is an ideal method for the production of bio-oil and carbohydrates, however, this system has not been systematically applied to the separation of highly active lignin and pretreated materials
[0007] In summary, because the structure and activity of lignin will vary greatly depending on its source and extraction method, and this structural difference directly affects the further utilization of lignin.

Method used

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  • Method for extracting highly active lignin from biomass and lignin obtained therefrom
  • Method for extracting highly active lignin from biomass and lignin obtained therefrom
  • Method for extracting highly active lignin from biomass and lignin obtained therefrom

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Such as figure 1 Shown, a kind of method for extracting highly active lignin from biomass, comprises the following steps:

[0050] (1) Biomass raw material pretreatment stage: crush eucalyptus wood and pass through a 40-mesh sieve, mix toluene and ethanol at a volume ratio of 2:1 to obtain a benzyl alcohol solution, and put eucalyptus wood powder in a Soxhlet extractor for use Benzyl alcohol solution was extracted for 6 hours, and then dried at 80°C to obtain lignocellulose powder;

[0051] (2) Extraction stage of lignin: place the lignocellulose powder obtained in step (1) and 70% isopropanol aqueous solution according to the solid-liquid ratio of 1:10 (m / v) in a 200° C. Extract in the autoclave for 60 minutes, after the extraction, pass condensed water into the autoclave to make it drop to room temperature, and filter with a 200-mesh filter cloth to separate the solid-liquid mixture in the autoclave to obtain biomass residue and filtrate;

[0052] (3) Separation sta...

Embodiment 2

[0055] Such as figure 1 Shown, a kind of method for extracting highly active lignin from biomass, comprises the following steps:

[0056] (1) Biomass raw material pretreatment stage: crush eucalyptus wood and pass through a 40-mesh sieve, mix toluene and ethanol at a volume ratio of 2:1 to obtain a benzyl alcohol solution, and put eucalyptus wood powder in a Soxhlet extractor for use Benzyl alcohol solution was extracted for 8 hours, and then dried at 70°C to obtain lignocellulose powder;

[0057] (2) Extraction stage of lignin: place the lignocellulose powder obtained in step (1) and 70% isopropanol aqueous solution according to the solid-liquid ratio of 1:10 (m / v) in a 220° C. Extract in the autoclave for 60min, after the extraction, pass condensed water into the autoclave to make it drop to room temperature, and filter with a 300-mesh filter cloth to separate the solid-liquid mixture in the autoclave to obtain biomass residue and filtrate;

[0058] (3) Separation stage of...

Embodiment 3

[0061] Such as figure 1 Shown, a kind of method for extracting highly active lignin from biomass, comprises the following steps:

[0062] (1) Biomass raw material pretreatment stage: crush eucalyptus wood and pass through a 50-mesh sieve, mix toluene and ethanol at a volume ratio of 2:1 to obtain a benzyl alcohol solution, and put eucalyptus wood powder in a Soxhlet extractor for use Benzyl alcohol solution was extracted for 7 hours, and then dried at 80°C to obtain lignocellulose powder;

[0063] (2) Extraction stage of lignin: place the lignocellulose powder obtained in step (1) and 70% isopropanol aqueous solution according to the solid-liquid ratio of 1:10 (m / v) in a 200° C. Extract in the autoclave for 120min, after the extraction, pass condensed water into the autoclave to make it drop to room temperature, and filter with a 200-mesh filter cloth to separate the solid-liquid mixture in the autoclave to obtain biomass residue and filtrate;

[0064] (3) Separation stage o...

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Abstract

The invention discloses a method for extracting high-activity lignin from biomass and lignin extracted by the same. The method comprises the following steps: (a) obtaining high-purity and high-activity lignin from a biomass raw material ground to 20-60 meshes by using an alcohol organic solvent through an acid liquid precipitation way; and (b) hydrolyzing the residue obtained in the step (a) with cellulase at 50 DEG C for 72h to obtain high-yield fermentable glucose for bioethanol preparation. In the invention, pretreatment using isopropyl alcohol is creatively proposed under specific conditions to break a lignin-carbohydrate bond and a beta-O-4-aryl ether bond so as to efficiently separate and extract low-molecular weight high-activity lignin, and theoretical basis and technical support are provided for further high-value utilization. Moreover, the pretreatment method remarkably improves the enzymolysis efficiency of the fiber raw material and provides an effective way for next bioethanol production.

Description

technical field [0001] The invention relates to the technical field of extraction and preparation of high-activity lignin and efficient production of bioethanol by using biomass raw materials, in particular to a relatively complete structure of low-molecular-weight high-activity lignin and its separation and extraction method, thereby breaking the barrier of biomass degradation resistance Barrier, improve cellulase hydrolysis efficiency, improve bioethanol production efficiency. Background technique [0002] The main components of biomass raw materials are cellulose (35%-50%), hemicellulose (20%-40%) and lignin (15%-25%). Cellulose generally forms the main body of wood fiber as a skeleton substance, hemicellulose is deposited on the surface of cellulose in the form of hydrogen bonding, lignin is cross-linked with hemicellulose in the form of covalent bonds, and forms a bridge The three major components are intertwined to form a network space structure, which hinders and lim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00C07G1/00
CPCC07G1/00
Inventor 文甲龙孙润仓王兵沈晓骏朱铭强陈天影
Owner BEIJING FORESTRY UNIVERSITY
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