Eutectic solvent for dissolving cellulose and method for dissolving cellulose

A low eutectic solvent and technology for dissolving cellulose, applied in the field of cellulose dissolving, can solve the problems of poor dissolving ability of cellulose, weak ability to form new hydrogen bonds of cellulose hydrogen bonds, poor dissolving ability of cellulose and hydrogen bonding, etc. Achieve the effect of improving the solubility, weakening its own hydrogen bonding, and increasing the degree of damage

Pending Publication Date: 2021-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has also been widely studied by domestic and foreign scholars in the field of cellulose dissolution, but the poor solubility of cellulose restricts the large-scale development of deep eutectic solvents in the field of cellulose materials.
According to the current research, the reason for the poor dissolving ability of deep eutectic solvents for cellulose is that the solvent system itself has strong hydrogen bonds, and its ability to destroy cellulose hydrogen bonds and form new hydrogen bonds with cellulose molecules is weak.

Method used

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  • Eutectic solvent for dissolving cellulose and method for dissolving cellulose
  • Eutectic solvent for dissolving cellulose and method for dissolving cellulose
  • Eutectic solvent for dissolving cellulose and method for dissolving cellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0044]Mix microcrystalline cellulose, sodium periodate, and deionized water with a mass ratio of 1:0.6:10, and oxidize microcrystalline cellulose at 50°C for 8 hours. After the oxidation is completed, wash and filter with deionized water for 5 times to The reaction reagents are removed to obtain oxidized cellulose. Mix resorcinol and choline chloride at a molar ratio of 1:1 at 80°C for 1 hour to obtain a transparent and uniform deep eutectic solvent at room temperature. Add 1.5 g of oxidized cellulose (absolute dry weight) into 30 g of deep eutectic solvent, stir and dissolve at 80° C. for 2 h to obtain a cellulose solution.

[0045] The process schematic diagram of the deep eutectic solvent dissolving cellulose of embodiment 1 is as figure 1 shown.

Embodiment 2

[0047] Mix microcrystalline cellulose, sodium periodate, and deionized water with a mass ratio of 1:0.4:8, and oxidize microcrystalline cellulose at 30°C for 22 hours. After the oxidation is completed, wash and filter with deionized water for 5 times to The reaction reagents are removed to obtain oxidized cellulose. Mix phenol and betaine at a molar ratio of 1:0.5 at 60°C for 2 hours to obtain a transparent and uniform deep eutectic solvent at room temperature. Add 3 g of oxidized cellulose (absolute dry weight) into 60 g of deep eutectic solvent, stir and dissolve at 100° C. for 1 h to obtain a cellulose solution.

Embodiment 3

[0049] Mix α-cellulose, potassium periodate and deionized water with a mass ratio of 1:0.6:12, and oxidize microcrystalline cellulose at 70°C for 4 hours. After the oxidation is completed, wash and filter with deionized water for 5 times until the reaction Reagents are removed to obtain oxidized cellulose. Mix hydrogen bond donors and hydrogen bond acceptors with a molar ratio of 1:3 at 100°C for 0.5 h to obtain a transparent and uniform deep eutectic solvent at room temperature. Among the hydrogen bond donors, hydroquinone and cresol The molar ratio is 1:1, and in the hydrogen bond acceptor, the molar ratio of tetramethylammonium chloride and methyltriphenylphosphine bromide is 1:1. Add 4.5g of oxidized cellulose (absolute dry weight) into 30g of deep eutectic solvent, react and dissolve in a 70°C internal mixer for 4h to obtain a cellulose solution.

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Abstract

The invention belongs to the technical field of cellulose dissolution, and provides a deep-eutectic solvent for dissolving cellulose, the deep-eutectic solvent comprises a hydrogen bond donor and a hydrogen bond acceptor; the molar ratio of the hydrogen bond donor to the hydrogen bond acceptor is 1: (0.5-3); and the hydrogen bond donor is a phenolic compound, and the phenolic compound comprises one or more of phenol, resorcinol, hydroquinone, cresol, thymol and bisphenol A. The invention also provides a method for dissolving cellulose by using the eutectic solvent. The invention provides a method for introducing a local chemical bond between a deep-eutectic solvent and cellulose, so that the damage degree of a cellulose hydrogen bond and the reconstruction efficiency of the cellulose hydrogen bond and a deep-eutectic solvent hydrogen bond are remarkably improved; and the dissolving capacity of the deep eutectic solvent to cellulose is remarkably improved, and the dissolving method is high in efficiency, short in time and easy to control.

Description

technical field [0001] The invention relates to the technical field of cellulose dissolution, in particular to a deep eutectic solvent for dissolving cellulose and a method for dissolving cellulose. Background technique [0002] Cellulose is a renewable biomass resource that is extremely abundant in nature and has a wide range of sources. Its development and utilization in the fields of energy, chemicals and materials can effectively alleviate the dependence on non-renewable resources and play an important role in the development of a sustainable society. significance. However, cellulose has a unique stereochemical structure, strong hydrogen bonding, high degree of polymerization and crystallinity, so that the energy required for the disentanglement and separation of cellulose molecular chains is very high, which makes it difficult to dissolve cellulose in most Part of the solvent, and cannot be melt-processed below the thermal decomposition temperature, so that cellulose i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/09C08L1/04
CPCC08J3/095C08J3/096C08J2301/04
Inventor 雷波冯彦洪
Owner SOUTH CHINA UNIV OF TECH
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