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Method for ultra-fast pretreatment of lignocellulose in biomass

A technology for pretreatment of biomass and lignocellulose, applied in fermentation and other directions, can solve the problems of ineffective lignin removal, poor pretreatment effect, and increased processing difficulty, and achieves low price, easy recycling, and step-by-step easy effect

Pending Publication Date: 2021-06-29
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional treatment process, physical methods mainly include ball milling method and steam explosion method. Among them, although steam explosion method has high enzymatic hydrolysis efficiency, it requires high equipment and large investment, which restricts large-scale production; while chemical method although It includes various pretreatment methods such as acid method and alkali method. However, acid pretreatment has no obvious effect on lignin removal, and it is easy to produce microbial fermentation inhibitors, which increases the difficulty of subsequent treatment and will cause subsequent enzymatic hydrolysis efficiency. In addition, although the cost of alkali pretreatment is lower than that of the acid reactor, and the operation is safe, it still needs to carry out the recovery and treatment process of wastewater and residues; Mild but the pretreatment effect is not good, and the time is too long, it is not easy to put into industrial production
[0004] In view of this, it is necessary to provide a method for ultra-fast pretreatment of lignocellulose, to solve or at least alleviate the above-mentioned technical defects of low enzymatic hydrolysis efficiency, slow processing speed and high cost

Method used

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  • Method for ultra-fast pretreatment of lignocellulose in biomass

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Embodiment 1

[0030] A method for ultra-fast pretreatment of lignocellulose in biomass, comprising steps:

[0031] 1. Wash a large piece of rice straw with a length of 2 cm twice with deionized water, and dry it to a constant weight at 60°C.

[0032] 2. Mix choline chloride, oxalic acid, and lactic acid in a molar ratio of 1:0.5:0.5, stir and mix at 60°C for 2 hours to obtain a transparent and uniform liquid, cool it to room temperature and store it for later use, and name the liquid three Elemental deep eutectic solvent.

[0033] 3. Take the rice straw obtained in step 1 and add it to the microwave digestion tank containing the ternary deep eutectic solvent obtained in step 2 according to the solid-to-liquid ratio of 1g:30mL, then place it in a microwave oven, treat it with microwaves at 680W for 4min, and take it out after filtration The solid filter residue is named as the filter residue to be treated.

[0034] 4. Wash the resulting filter residue to be treated with deionized water unt...

Embodiment 2

[0040] A method for ultra-fast pretreatment of lignocellulose in biomass, comprising steps:

[0041] 1. Wash a large piece of rice straw with a length of 2 cm twice with deionized water, and dry it to a constant weight at 60°C.

[0042] 2. Mix choline chloride, oxalic acid, and lactic acid in a molar ratio of 1:0.5:1, stir and mix at 60°C for 2 hours to obtain a transparent and uniform liquid, cool it to room temperature and store it for later use, and name the liquid three Elemental deep eutectic solvent.

[0043]3. Take the rice straw obtained in step 1 and add it to the microwave digestion tank containing the ternary deep eutectic solvent obtained in step 2 according to the solid-to-liquid ratio of 1g:30mL, then place it in a microwave oven, treat it with microwaves at 680W for 4min, filter and take The solid filter residue is named as the filter residue to be treated.

[0044] 4. Wash the resulting filter residue to be treated with deionized water until the pH is neutral...

Embodiment 3

[0047] A method for ultra-fast pretreatment of lignocellulose in biomass, comprising steps:

[0048] 1. Wash a large piece of rice straw with a length of 2 cm twice with deionized water, and dry it to a constant weight at 60°C.

[0049] 2. Mix choline chloride, oxalic acid, and lactic acid in a molar ratio of 1:0.5:1.5, stir and mix at 60°C for 2 hours to obtain a transparent and uniform liquid, cool it to room temperature and store it for later use, and name the liquid three Elemental deep eutectic solvent.

[0050] 3. Take the rice straw obtained in step 1 and add it to the microwave digestion tank containing the deep eutectic solvent obtained in step 2 according to the solid-to-liquid ratio of 1g:30mL, and then place it in a microwave oven, microwave at 680W for 4 minutes, and take the solid filter residue after filtration , and name the solid filter residue as the filter residue to be treated.

[0051] 4. Wash the resulting filter residue to be treated with deionized wat...

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Abstract

The invention provides a method for ultra-fast pretreatment of lignocellulose in biomass. The method comprises the following steps: S1, adding waste biomass into a ternary low-eutectic solvent, and sequentially carrying out microwave treatment and solid-liquid separation treatment to obtain to-be-treated filter residues, wherein the ternary low-eutectic solvent comprises a solvent prepared from choline chloride, oxalic acid and lactic acid in a molar ratio of 1:0.5:(0.5-1.5); the solid-to-liquid ratio of the waste biomass to the ternary low-eutectic solvent is 1g:(25-45)mL; and S2, cleaning the to-be-treated filter residues until the pH value is neutral, and then carrying out freeze-drying treatment to obtain the waste biomass subjected to lignocellulose pretreatment. By means of the pretreatment method, the enzymolysis efficiency can be improved; the pretreatment speed can be increased; and the treatment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of biomass new energy, in particular to a method for ultra-fast pretreatment of lignocellulose in biomass. Background technique [0002] In order to reduce the dependence on fossil fuels, governments and scientific research institutions of various countries have vigorously carried out the development and research of renewable energy, and the second-generation biomass, which uses agricultural and forestry waste as raw materials, has been paid attention to and has become one of the current alternative energy sources. Agricultural and forestry wastes are natural lignocellulosic resources, mainly composed of cellulose, hemicellulose and lignin, of which the lignin content is about 5% to 30%. Lignin is a complex, amorphous polymer formed by linking phenylpropane through ether bonds and carbon-carbon bonds, so that without any treatment, the efficiency of saccharification and fermentation of lignocellulose is extr...

Claims

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Application Information

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IPC IPC(8): C12P19/14C12P19/02
CPCC12P19/14C12P19/02C12P2201/00C12P2203/00
Inventor 石岩王钟任史美清司梦莹袁梦婷
Owner CENT SOUTH UNIV
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