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Preparation and application of controllable and selective lignin extraction switch type deep-eutectic solvent

A deep eutectic solvent and lignin technology, applied in the field of biomass refining, can solve the problems of limited selection range of hydrogen bond donors and acceptors, restrictions on deep eutectic solvent systems, poor design, etc., to achieve easy promotion and low cost , the effect of simple processing method

Active Publication Date: 2022-02-25
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing studies mainly focus on the choline-based deep eutectic solvent system, which consists of a hydrogen bond donor (mostly an organic acid) and a hydrogen bond acceptor to form a binary deep eutectic solvent system. Due to its relatively simple composition , the selection range of hydrogen bond donors and acceptors is limited, so the design is poor, and it is not easy to carry out targeted design for the characteristics of raw materials when processing plant fibers and biomass raw materials
At the same time, in order to improve the extraction effect of lignin and improve the separation efficiency, most of the selected choline deep eutectic solvents have strong polarity, so it is not easy to combine with other polar groups in the lignocellulosic raw material in the subsequent recycling process. Separation
The above defects limit the further application of deep eutectic solvent system in the separation of plant fiber components, especially in the process of lignin separation

Method used

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  • Preparation and application of controllable and selective lignin extraction switch type deep-eutectic solvent
  • Preparation and application of controllable and selective lignin extraction switch type deep-eutectic solvent
  • Preparation and application of controllable and selective lignin extraction switch type deep-eutectic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The ionic liquid system with polarity switching properties was prepared by using DBU and alcohol compounds.

[0059] (1) Preparation of ionic liquid: take DBU and alcohol compound at a molar ratio of 1:1 to 1:3, mix and stir for 1 hour at 20°C to obtain a non-polar ionic liquid.

[0060] (2) Polarity conversion detection. Charge into CO in the nonpolar ionic liquid system described in step (1) 2 , 15min. Afterwards, the reaction was left to stand for 1 h to obtain a polar ionic liquid system.

[0061] (3) Detect the polarity, pH and viscosity of the system obtained in the above steps (1) and (2).

[0062] (4) Stability testing. Treat the polar ionic liquid obtained in the above step (2) in a water bath at 80°C for 4 hours, and discharge CO 2 , to obtain a non-polar ionic liquid. Then filled with CO 2 , 15min, and left to react for 1h to obtain a polar ionic liquid system. Repeat the above charging and discharging of CO 2 Operation, testing system stability.

...

Embodiment 2

[0070] A deep eutectic solvent system with polarity-switching properties was prepared using DBU-hexanol ionic liquid and a hydrogen-bonding ligand.

[0071] (1) Preparation of ionic liquid: Take DBU and hexanol at a molar ratio of 1:1, mix and stir for 1 hour at 20°C to obtain an ionic liquid.

[0072] (2) Preparation of deep eutectic solvent: according to the mass ratio of ionic liquid: hydrogen bond ligand 1:1, add different hydrogen bond ligands to the ionic liquid system described in step (1), mix and stir for 1 h at 20° C. to obtain Deep eutectic solvent.

[0073] (3) Polarity conversion detection. Charge into CO in the nonpolar deep eutectic solvent system described in step (2) 2 , 15min. Subsequently, the reaction was left to stand for 1 h to obtain a polar deep eutectic solvent system.

[0074] (1) Detect the polarity, pH and viscosity of the system obtained in the above steps (2) and (3).

[0075] (2) Stability testing. Treat the polar deep eutectic solvent obta...

Embodiment 3

[0081] A deep eutectic solvent system of DBU-hexanol / water was used to dissolve cellulose and lignin.

[0082] (1) Preparation of ionic liquid: Take DBU and hexanol at a molar ratio of 1:1, mix and stir for 1 hour at 20°C to obtain an ionic liquid.

[0083] (2) Preparation of deep eutectic solvent: according to the ionic liquid:water molar ratio of 1:5, add water to the ionic liquid system described in step (1), and mix and stir at 20°C for 1 hour to obtain a deep eutectic solvent.

[0084] (3) Detection of lignin and cellulose solubility. At normal temperature (30°C), the ionic liquid and deep eutectic solvent prepared in steps (1) and (2) were filled with CO 2 Solubility of syringic acid, vanillic acid, alkali lignin and microcrystalline cellulose before and after.

[0085] The comparative results of the solubility of ionic liquids and deep eutectic solvents on lignin and cellulose obtained according to this method are as follows.

[0086]

[0087]

[0088] Results: T...

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Abstract

The invention belongs to the field of biomass refining, and relates to preparation and application of a controllable and selective lignin extraction switch type deep-eutectic solvent, which comprises the following steps: ionic liquid preparation, eutectic solvent preparation and selective lignin dissolution. The deep-eutectic solvent is characterized by being prepared by mixing a switching type compound and an alcohol compound and then mixing the mixture with a hydrogen bond ligand. The switch-type deep-eutectic solvent can selectively extract lignin under mild conditions, controls the polarity, viscosity, pH and lignin solubility of a system through CO2 absorption and desorption, and has no dissolving effect on cellulose components. Therefore, the method provided by the invention can be used for controllable selective dissolution of lignin, and is simple to operate, obvious in effect, high in practicability, small in pollution and easy to popularize.

Description

technical field [0001] The invention belongs to the field of biomass refining, and in particular relates to a method for preparing a switch-type deep eutectic solvent with polarity conversion characteristics, and its application in the process of selectively dissolving and extracting lignin. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Woody biomass resources are an important renewable resource, mainly composed of cellulose, hemicellulose and lignin. The three are interconnected through primary and secondary valent bonds such as covalent bonds, van der Waals forces and hydrogen bonds, making it difficult for the components of lignocellulosic raw materials to be dissolv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/02
CPCB01D11/0292Y02P20/54
Inventor 齐乐天杨梦茹杨桂花陈嘉川薛玉
Owner QILU UNIV OF TECH