A method for efficient separation of straw components using a new type of deep eutectic solvent

A low eutectic solvent, a new type of technology, applied in the use of microorganism/enzyme cellulose treatment, papermaking, textiles and papermaking, etc., can solve the problems of small molecular weight of lignin, narrow utilization window, destruction, etc., to achieve simple synthesis and high efficiency The effect of removing and improving the efficiency of recycling

Active Publication Date: 2022-04-12
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The current method of using DES to treat straw has the following problems: (1) Although DES has a strong solubility selectivity and shows a good dissolving ability for lignin, it can also dissolve a certain amount of cellulose and hemicellulose, especially It is its degradation products and by-products, such as xylose, glucose, arabinose, rhamnose, furfural, fatty acids, etc., and this part of dissolved matter is not easy to remove from DES, which seriously affects the effect of DES reuse
However, the existing treatment methods have not effectively solved this problem in terms of process steps and process conditions, which not only affects the recycling of DES, but also affects the subsequent high-value utilization of lignin, cellulose and hemicellulose components in straw.
[0007] (2) At present, most of the methods of treating straw with DES are carried out in an alkaline environment, and the alkaline environment will cause serious damage to the lignin components. The molecular weight of the extracted lignin is generally small, so the polydispersity coefficient is also small. Take advantage of the narrow window
A few treatment methods under acidic conditions not only remove lignin, but also acidify part of hemicellulose and cellulose, which affects the utilization rate of hemicellulose and cellulose

Method used

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  • A method for efficient separation of straw components using a new type of deep eutectic solvent
  • A method for efficient separation of straw components using a new type of deep eutectic solvent
  • A method for efficient separation of straw components using a new type of deep eutectic solvent

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Experimental program
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Embodiment 1

[0040]The method of highly separating straw components using new low-molten solvents, including the following steps:

[0041] (1) Synthesis of new low-molten solvent: Choline, polyethylene glycol-200 and boric acid are synthesized according to Table 2, which is directly used without purification;

[0042] (2) Straw primary treatment: First, the straw and deionized water are mixed according to the solid-liquid ratio of 1:15, and the reaction is 0.5 h at 120 ° C; then the solid-liquid separation is obtained to obtain the filtrate I and the filter residue I, and the filter residue I is used Ion water was washed 2 ~ 3 times, and the straw residue treated by one level was obtained;

[0043] (3) Extraction of hemicellulose: ethanol is added to the filtrate I obtained from step (2), wherein the volume ratio of ethanol and the filtrate I is 5: 1; after standing precipitation, the desirated solid is washed with ethanol, centrifuged. That is, half cellulose; filtered the obtained ethanol fi...

Embodiment 2

[0054] The method of highly separating straw components using new low-molten solvents, including the following steps:

[0055] (1) Synthesis of a new type of low-molten solvent: mixing choline, polyethylene glycol-200 and boric acid in accordance with molar ratio 1: 1: 1.5, reacting at 80 ° C for 1 h, i.e., a new low-molten solvent No need to purify directly;

[0056] (2) Straw primary treatment: First, the straw and deionized water are mixed according to the solid-liquid ratio of 1:15, and the reaction is 0.5 h at 120 ° C; then the solid-liquid separation is obtained to obtain the filtrate I and the filter residue I, and the filter residue I is used Ion water was washed 2 ~ 3 times, and the straw residue treated by one level was obtained;

[0057] (3) Extraction of hemicellulose: ethanol is added to the filtrate I obtained from step (2), wherein the volume ratio of ethanol and the filtrate I is 5: 1; after standing precipitation, the desirated solid is washed with ethanol, centri...

Embodiment 3

[0065] The method of highly separating straw components using new low-molten solvents, including the following steps:

[0066] (1) Synthesis of a new type of low-molten solvent: mixing choline, polyethylene glycol-200 and boric acid in accordance with molar ratio 1: 1: 1.5, reacting at 80 ° C for 1 h, i.e., a new low-molten solvent No need to purify directly;

[0067] (2) Straw primary treatment: First, the straw and deionized water are mixed according to the solid-liquid ratio of 1:15, and the reaction is 0.5 h at 120 ° C; then the solid-liquid separation is obtained to obtain the filtrate I and the filter residue I, and the filter residue I is used Ion water was washed 2 ~ 3 times, and the straw residue treated by one level was obtained;

[0068] (3) Extraction of hemicellulose: ethanol is added to the filtrate I obtained from step (2), wherein the volume ratio of ethanol and the filtrate I is 5: 1; after standing precipitation, the desirated solid is washed with ethanol, centri...

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Abstract

The invention belongs to the technical field of biomass resource utilization, and in particular relates to a method for efficiently separating straw components by using a novel deep eutectic solvent. The method for efficiently separating straw components using a novel deep eutectic solvent comprises the following steps: (1) synthesis of a novel deep eutectic solvent; (2) primary treatment of straw; (3) extraction of hemicellulose; (4) ) extraction of crude cellulose; (5) extraction of crude cellulose; (6) extraction of lignin; (7) enzymatic hydrolysis. The method achieves the purpose of efficiently separating components in the straw, improves the high-value utilization efficiency of lignin, hemicellulose and cellulose in the straw, reduces pollution, and saves costs.

Description

Technical field [0001] The present invention belongs to the technical field of biomass resource, and in particular, a method involving high-efficiency separation of straw components with a new type of low-molten solvent. Background technique [0002] my country has produced more than 7 billion crop straws every year, and my country's sugar cane production is ranked third in the world. However, the industrial and agricultural by-products of such industrial and agricultural use have not been reasonably utilized, resulting in great waste of resources. The industrial and agricultural waste is used as a source of rich and cheap biomass raw materials for producing biofuels and platform compounds, achieving their high-value utilization, and promoting my country's economic development and environmental protection for China's economic development and environmental protection. significance. [0003] Biomass resources are the highest storage of renewable energy in nature, developing high-ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00C08B37/14D21C5/00C12P19/14
CPCC08H6/00C08B37/0003D21C5/005C12P19/14
Inventor 马云倩臧立华慈玉辉
Owner QILU UNIV OF TECH
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