Process for extracting lignin from lignocellulose biomass

A technology for lignocellulose and biomass, which is applied in the technical field of extracting lignin, can solve the problems of low extraction rate, affecting processing efficiency, and inability to completely separate out lignin, and achieves the effects of high extraction efficiency and concise process route.

Active Publication Date: 2013-06-05
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Abstract
  • Description
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Problems solved by technology

However, this patent also has the following disadvantages: 1. From the description in the manual, it can be seen that the process uses organic acid mixed with a catalyst represented by sulfuric acid for the first step of catalysis, and a catalyst needs to be added for catalysis during the reaction; 2. This process uses organic acid and a catalyst represented by sulfuric acid to acidify the biomass together. In the step of distilling the organic acid, if the distillation of the organic acid is not complete, the lignin cannot be completely precipitated. If the organic acid is completely distilled, add The concentration of sulfuric acid in it will increase, which will carbonize the lignin in it and affect the extraction rate of lignin; 3. Although the same organic acid is used for extracting and washing cellulose in the whole process, and the collected pretreatment liquid and washing liquid are directly It is used to circulate to the reaction kettle of the first step, but a large amount of dissolved lignin and pentose sugar solution also accumulate in the whole mixed liquor. In view of the saturation limit of organic acid extraction, the effective degree of the mixed black liquo

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  • Process for extracting lignin from lignocellulose biomass

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Example Embodiment

[0042] Example 1

[0043] In the present embodiment, first corn cob (mass component composition: moisture 18.73%, cellulose 39.33%, hemicellulose 30.73%, lignin 29.94%) is crushed and crushed to a particle size of 0.5-20cm, preferably 2- 5cm.

[0044] The comprehensive utilization technique of lignocellulosic biomass described in this embodiment comprises the steps:

[0045] (1) After the biomass raw material is crushed and pretreated, use an organic acid solution containing 90% formic acid, 5% acetic acid and 5% water to carry out acid hydrolysis of the treated lignocellulosic biomass, and control the reaction temperature 70°C, reacting for 150 minutes, the liquid-solid mass ratio of the organic acid liquid and the biomass raw material is 1:6, and the obtained reaction liquid is subjected to solid-liquid separation for the first time;

[0046] Add the solid obtained from the above separation to an organic acid liquid containing 90% formic acid, 5% acetic acid and 5% water f...

Example Embodiment

[0052] Example 2

[0053] In the present embodiment, first corn cob (mass component composition: moisture 18.73%, cellulose 37.22%, hemicellulose 33.73%, lignin 29.05%) is crushed and crushed to a particle size of 0.5-20cm, preferably 2- 5cm.

[0054] The comprehensive utilization technique of lignocellulosic biomass described in this embodiment comprises the steps:

[0055] (1) After the biomass raw material is crushed and pretreated, use an organic acid solution containing 80% formic acid and 10% acetic acid and 10% water to carry out acid hydrolysis on the treated lignocellulosic biomass, and control The reaction temperature is 140°C, the reaction is 60min, the liquid-solid mass ratio of the mixed acid solution of formic acid and acetic acid to the biomass raw material is 1:10, and the obtained reaction solution is subjected to solid-liquid separation for the first time;

[0056] Add the solid obtained from the above separation to an organic acid liquid containing 80% for...

Example Embodiment

[0062] Example 3

[0063] In the present embodiment, first corn cob (mass component composition: moisture 16.25%, cellulose 31.45%, hemicellulose 34.77%, lignin 33.78%) is crushed and crushed to a particle size of 0.5-20cm, preferably 2- 5cm.

[0064] The comprehensive utilization technique of lignocellulosic biomass described in this embodiment comprises the steps:

[0065] (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 60% formic acid and 30% acetic acid and 10% water to control The reaction temperature is 120°C, the reaction is 120min, the liquid-solid mass ratio of the organic acid liquid and the biomass raw material is 1:8, and the obtained reaction liquid is subjected to solid-liquid separation for the first time;

[0066] Add the solid obtained from the above separation to an organic acid solution containing 50% formic acid, 40% acetic acid and...

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Abstract

The invention relates to a lignin extraction process, and particularly relates to a process for extracting lignin from lignocellulose biomass by using organic acids. The method of the invention extracts lignin by performing acidolysis of lignocellulose biomass with a mixed organic acid of formic acid with a concentration of 5-90% and acetic acid with a concentration of 5-90%; the lignin extraction rate is up to 85%; the whole process route is simple, and low in energy consumption; the process can be used for combined production of cellulose and pentose, and even products such as furfural and the like.

Description

technical field [0001] The invention relates to a lignin extraction process, in particular to a process for extracting lignin from lignocellulose by using organic acids. Background technique [0002] Lignin is a class of substances composed of polymerized aromatic alcohols, present in woody tissues, and its main function is to harden the cell wall by forming an interwoven network. Lignin is mainly located between cellulose fibers and acts as an anti-compression. In woody plants, lignin accounts for 25% and is the second most abundant organic matter in the world, after cellulose. [0003] With the deepening of human understanding of environmental pollution and resource crisis, the renewable and degradable properties of natural polymers have attracted increasing attention. The recycling of waste and the utilization of renewable resources are major issues in contemporary economic and social development, and are also new requirements for contemporary science and technology. I...

Claims

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Application Information

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IPC IPC(8): C08H7/00
Inventor 唐一林江成真高绍丰刘洁马军强栗昭争
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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