A kind of comprehensive utilization process of lignocellulosic biomass

Abstract

The invention relates to a comprehensive utilization method of lignocellulose biomass, and particularly relates to a comprehensive utilization method of cellulose, hemicellulose and lignin in lignocellulose biomass. The method of the invention respectively extracts cellulose, lignin, and hemicellulose by performing acidolysis of lignocellulose biomass with a mixed organic acid of formic acid and acetic acid; the comprehensive extraction rates of all the three substances are high; the cellulose extraction rate is 75%-100%; the lignin extraction rate is 55%-90%; the pentose extraction rate is 85%-95%; the method of the invention not only facilitates the comprehensive and stable operation of the three routes, but also ensures the extraction rates of the three products to the maximum extent.

Description

technical field

[0001] The invention relates to a method for comprehensively utilizing lignocellulosic biomass, in particular to a method for comprehensively utilizing cellulose, hemicellulose and lignin in lignocellulosic biomass. Background technique

[0002] With the depletion of fossil fuel resources and the increasing environmental pollution, the use of renewable energy as a substitute for petrochemical products has become increasingly important. Fuel ethanol is the main form of biomass liquid energy and the most likely substitute for fossil fuels. At present, the world's ethanol production mainly uses starches (corn, cassava, etc.) and sugars (sugar cane, sugar beets, etc.) as raw materials for fermentation. The technology of producing ethanol by microbial fermentation is mature, but the high cost of raw materials limits the industrial application of grain fermentation to produce ethanol. At the same time, there are disadvantages such as competition with people for gr...

Examples

Embodiment 1

[0047] In this embodiment, first corncobs (mass component composition: moisture 18.73%, cellulose 39.33%, hemicellulose 30.73%, lignin 29.94%) are crushed, washed with water to remove dust and crushed to a particle size of 0.5-20cm , preferably 0.5-5cm.

[0048] The comprehensive utilization technique of lignocellulosic biomass described in this embodiment comprises the steps:

[0049] (1) After the biomass raw material is pulverized and pretreated, use an organic acid solution with a concentration of 90% formic acid and 5% acetic acid and 5% water to carry out acid hydrolysis of the treated lignocellulosic biomass to control the reaction The temperature was 165°C, and the reaction was carried out for 10 minutes. The liquid-solid mass ratio of the mixed acid solution of formic acid and acetic acid to the biomass raw material was 1:20, and the obtained reaction solution was subjected to solid-liquid separation for the first time;

[0050] (2) the organic acid solution that is ...

Embodiment 2

[0064] In this embodiment, first corncobs (mass component composition: moisture 18.73%, cellulose 39.33%, hemicellulose 30.73%, lignin 29.94%) are crushed, washed with water to remove dust and crushed to a particle size of 0.5-20cm , preferably 0.5-5cm.

[0065] The comprehensive utilization technique of lignocellulosic biomass described in this embodiment comprises the steps:

[0066] (1) After the biomass raw material is pulverized and pretreated, the lignocellulosic biomass after treatment is acid-hydrolyzed by using an organic acid solution containing 40% formic acid and 50% acetic acid and 10% water to control The reaction temperature is 110°C, the reaction is 180min, the liquid-solid mass ratio of the mixed acid solution of formic acid and acetic acid to the biomass raw material is 1:15, and the obtained reaction solution is subjected to solid-liquid separation for the first time;

[0067] (2) The solid that is separated in step (1) is added into the organic acid soluti...

Embodiment 3

[0081] In this embodiment, first corncobs (mass component composition: moisture 16.25%, cellulose 31.45%, hemicellulose 34.77%, lignin 33.78%) are crushed, washed with water to remove dust and crushed to a particle size of 0.5-20cm , preferably 0.5-5cm.

[0082] The comprehensive utilization technique of lignocellulosic biomass described in this embodiment comprises the steps:

[0083] (1) After the biomass raw material is crushed and pretreated, use an organic acid solution containing 50% formic acid and 40% acetic acid and 10% water to carry out acid hydrolysis on the treated lignocellulosic biomass, and control The reaction temperature is 135° C., the reaction is 30 minutes, the liquid-solid mass ratio of the mixed acid solution of formic acid and acetic acid to the biomass raw material is 1:5, and the obtained reaction solution is subjected to solid-liquid separation for the first time;

[0084] (2) the solid that is separated in the step (1) is added the formic acid that...

technical field

[0001] The invention relates to a method for comprehensively utilizing lignocellulosic biomass, in particular to a method for comprehensively utilizing cellulose, hemicellulose and lignin in lignocellulosic biomass. Background technique

[0002] With the depletion of fossil fuel resources and the increasing environmental pollution, the use of renewable energy as a substitute for petrochemical products has become increasingly important. Fuel ethanol is the main form of biomass liquid energy and the most likely substitute for fossil fuels. At present, the world's ethanol production mainly uses starches (corn, cassava, etc.) and sugars (sugar cane, sugar beets, etc.) as raw materials for fermentation. The technology of producing ethanol by microbial fermentation is mature, but the high cost of raw materials limits the industrial application of grain fermentation to produce ethanol. At the same time, there are disadvantages such as competition with people for gr...

Examples

Embodiment 1

[0047] In this embodiment, first corncobs (mass component composition: moisture 18.73%, cellulose 39.33%, hemicellulose 30.73%, lignin 29.94%) are crushed, washed with water to remove dust and crushed to a particle size of 0.5-20cm , preferably 0.5-5cm.

[0048] The comprehensive utilization technique of lignocellulosic biomass described in this embodiment comprises the steps:

[0049] (1) After the biomass raw material is pulverized and pretreated, use an organic acid solution with a concentration of 90% formic acid and 5% acetic acid and 5% water to carry out acid hydrolysis of the treated lignocellulosic biomass to control the reaction The temperature was 165°C, and the reaction was carried out for 10 minutes. The liquid-solid mass ratio of the mixed acid solution of formic acid and acetic acid to the biomass raw material was 1:20, and the obtained reaction solution was subjected to solid-liquid separation for the first time;

[0050] (2) the organic acid solution that is ...

Embodiment 2

[0064] In this embodiment, first corncobs (mass component composition: moisture 18.73%, cellulose 39.33%, hemicellulose 30.73%, lignin 29.94%) are crushed, washed with water to remove dust and crushed to a particle size of 0.5-20cm , preferably 0.5-5cm.

[0065] The comprehensive utilization technique of lignocellulosic biomass described in this embodiment comprises the steps:

[0066] (1) After the biomass raw material is pulverized and pretreated, the lignocellulosic biomass after treatment is acid-hydrolyzed by using an organic acid solution containing 40% formic acid and 50% acetic acid and 10% water to control The reaction temperature is 110°C, the reaction is 180min, the liquid-solid mass ratio of the mixed acid solution of formic acid and acetic acid to the biomass raw material is 1:15, and the obtained reaction solution is subjected to solid-liquid separation for the first time;

[0067] (2) The solid that is separated in step (1) is added into the organic acid soluti...

Embodiment 3

[0081] In this embodiment, first corncobs (mass component composition: moisture 16.25%, cellulose 31.45%, hemicellulose 34.77%, lignin 33.78%) are crushed, washed with water to remove dust and crushed to a particle size of 0.5-20cm , preferably 0.5-5cm.

[0082] The comprehensive utilization technique of lignocellulosic biomass described in this embodiment comprises the steps:

[0083] (1) After the biomass raw material is crushed and pretreated, use an organic acid solution containing 50% formic acid and 40% acetic acid and 10% water to carry out acid hydrolysis on the treated lignocellulosic biomass, and control The reaction temperature is 135° C., the reaction is 30 minutes, the liquid-solid mass ratio of the mixed acid solution of formic acid and acetic acid to the biomass raw material is 1:5, and the obtained reaction solution is subjected to solid-liquid separation for the first time;

[0084] (2) the solid that is separated in the step (1) is added the formic acid that...

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