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Method for efficiently separating straw components by adopting novel eutectic solvent

A low eutectic solvent, a new type of technology, applied in the use of microorganism/enzyme cellulose treatment, textiles and papermaking, papermaking, etc., can solve the problems affecting high-value utilization, narrow utilization window, small molecular weight of lignin, etc., to achieve value-added The effect is obvious, the utilization rate of raw materials is high, and the effect of high-efficiency removal

Active Publication Date: 2020-11-20
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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  • Method for efficiently separating straw components by adopting novel eutectic solvent
  • Method for efficiently separating straw components by adopting novel eutectic solvent
  • Method for efficiently separating straw components by adopting novel eutectic solvent

Examples

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Effect test

Embodiment 1

[0040]The method for efficiently separating straw components using a novel deep eutectic solvent comprises the following steps:

[0041] (1) Synthesis of novel deep eutectic solvent: choline chloride, polyethylene glycol-200 and boric acid are synthesized novel deep eutectic solvent as shown in Table 2, can be used directly without purification;

[0042] (2) Primary treatment of straw: first, mix straw and deionized water according to the solid-to-liquid ratio of 1:15, and react at 120°C for 0.5h; then perform solid-liquid separation to obtain filtrate I and filter residue I, and use filter residue I Washing with ion water for 2-3 times, drying to absolute dryness to obtain the straw residue of primary treatment;

[0043] (3) Extraction of hemicellulose: add ethanol in the filtrate I of step (2) gained, wherein the volume ratio of ethanol and filtrate I is 5:1; The hemicellulose is obtained; the ethanol filtrate obtained by filtering is rotary evaporated and recycled;

[004...

Embodiment 2

[0054] The method for efficiently separating straw components using a novel deep eutectic solvent comprises the following steps:

[0055] (1) Synthesis of a new type of deep eutectic solvent: mix choline chloride, polyethylene glycol-200 and boric acid at a molar ratio of 1:1:1.5, and react at 80°C for 1 hour to obtain a new type of deep eutectic solvent , can be used directly without purification;

[0056] (2) Primary treatment of straw: first, mix straw and deionized water according to the solid-to-liquid ratio of 1:15, and react at 120°C for 0.5h; then perform solid-liquid separation to obtain filtrate I and filter residue I, and use filter residue I Washing with ion water for 2-3 times, drying to absolute dryness to obtain the straw residue of primary treatment;

[0057] (3) Extraction of hemicellulose: add ethanol in the filtrate I of step (2) gained, wherein the volume ratio of ethanol and filtrate I is 5:1; The hemicellulose is obtained; the ethanol filtrate obtained ...

Embodiment 3

[0065] The method for efficiently separating straw components using a novel deep eutectic solvent comprises the following steps:

[0066] (1) Synthesis of a new type of deep eutectic solvent: mix choline chloride, polyethylene glycol-200 and boric acid at a molar ratio of 1:1:1.5, and react at 80°C for 1 hour to obtain a new type of deep eutectic solvent , can be used directly without purification;

[0067] (2) Primary treatment of straw: first, mix straw and deionized water according to the solid-to-liquid ratio of 1:15, and react at 120°C for 0.5h; then perform solid-liquid separation to obtain filtrate I and filter residue I, and use filter residue I Washing with ion water for 2-3 times, drying to absolute dryness to obtain the straw residue of primary treatment;

[0068] (3) Extraction of hemicellulose: add ethanol in the filtrate I of step (2) gained, wherein the volume ratio of ethanol and filtrate I is 5:1; The hemicellulose is obtained; the ethanol filtrate obtained ...

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Abstract

The invention belongs to the technical field of biomass recycling, and particularly relates to a method for efficiently separating straw components by adopting a novel eutectic solvent. The method forefficiently separating the straw components by adopting the novel eutectic solvent comprises the following steps: (1) synthesizing the novel eutectic solvent; (2) carrying out primary treatment of straw; (3) extracting hemicellulose; (4) extracting crude cellulose; (5) extracting crude cellulose; (6) extracting lignin; (7) enzymolysis. By means of the method, the purpose of efficiently separatingcomponents in the straw is achieved, the high-value utilization efficiency of lignin, hemicellulose and cellulose in the straw is improved, pollution is reduced, and cost is saved.

Description

technical field [0001] 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. Background technique [0002] As a large agricultural country, my country produces more than 700 million tons of crop straw every year, and my country's bagasse production ranks third in the world. However, this type of industrial and agricultural by-products has not been rationally utilized, resulting in a great waste of resources. As a kind of abundant and cheap biomass raw material, industrial and agricultural waste is used to produce biofuels and platform compounds, and its high-value utilization is of great significance to the establishment of a sustainable energy system, the promotion of my country's economic development and environmental protection. significance. [0003] Biomass resources are the renewable energy with the highest storage capacity i...

Claims

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Application Information

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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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