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Thermo-sensitive acidic ionic liquid and preparation method and application thereof in catalyzing microcrystalline cellulose hydrolysis

An acidic ionic liquid, microcrystalline cellulose technology, applied in the preparation of carboxylate, sugar derivatives, chemical instruments and methods, etc., can solve the problem of increasing processing costs and environmental pressure, difficult separation and recovery of acidic catalysts, and reusable It has the advantages of excellent hydrolysis activity, easy separation and recovery, and convenient recovery.

Inactive Publication Date: 2018-06-29
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfuric acid or other organic acids are still used as acidic catalysts in the above method. Liquid acid catalysis is severely corrosive to equipment, and the acidic waste liquid after the reaction needs to be neutralized before it can be discharged, which increases the treatment cost and environmental pressure.
However, the main problem of the above-mentioned liquid acid is that the acidic catalyst is difficult to separate and recover in water, and the reusability is not strong.

Method used

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  • Thermo-sensitive acidic ionic liquid and preparation method and application thereof in catalyzing microcrystalline cellulose hydrolysis
  • Thermo-sensitive acidic ionic liquid and preparation method and application thereof in catalyzing microcrystalline cellulose hydrolysis
  • Thermo-sensitive acidic ionic liquid and preparation method and application thereof in catalyzing microcrystalline cellulose hydrolysis

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preparation example Construction

[0055] The temperature-sensitive acidic ionic liquid prepared according to the present invention can realize the recovery of the liquid acid catalyst by adjusting the temperature-sensitive property of the catalyst, and both the recovery of the catalyst and the environmental problems will be greatly improved. The temperature-sensitive ionic liquid catalyst not only has a hydrolysis effect, but also solves the recovery problem of the acidic catalyst. Commercial ionic liquids are generally soluble in water and do not have acidic groups, and need to be coupled with other acidic catalysts for reaction, which greatly limits the application of ionic liquids in the process of hydrolyzing cellulose.

[0056] In addition, since the temperature-sensitive acidic ionic liquid of the present invention itself is an acidic catalyst, it can greatly destroy the cellulose crystal structure and speed up the reaction rate. Compared with other two-liquid phase systems, it is not necessary to add oth...

preparation Embodiment 1

[0061] Betaine (0.03mol) and bistrifluoromethanesulfonic acid imide (0.03mol) were stirred uniformly in water, then heated and reacted in an oil bath at 60°C for 1h. After the reaction was completed and cooled to room temperature, the water in the flask was removed by suspension steaming, and the obtained solid was dried at 40° C. under vacuum for 12 hours, and the obtained solid was a solidified acidic ionic liquid catalyst.

[0062] figure 1 It is a photo of the acidic ionic liquid catalyst obtained in Example 1 dissolving in high-temperature water. When the temperature rises to 60° C., the ionic liquid catalyst is completely miscible with water to form a homogeneous catalyst system.

[0063] figure 2 It is a photograph of the precipitation of the acidic ionic liquid catalyst obtained in Example 1 in water at room temperature. When the temperature drops to room temperature, the ionic liquid catalyst precipitates from the water phase to form a two-liquid phase catalyst syst...

preparation Embodiment 2

[0065] Betaine (0.03 mol) and tetrafluoroboric acid (0.03 mol) were stirred uniformly in water, then heated and reacted in an oil bath at 60° C. for 1 h. After the reaction was completed and cooled to room temperature, the water in the flask was removed by suspension steaming, and the obtained solid was dried at 40° C. under vacuum for 12 hours, and the obtained solid was a solidified acidic ionic liquid catalyst.

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Abstract

The invention relates to thermo-sensitive acidic ionic liquid and a preparation method and application thereof in catalyzing microcrystalline cellulose hydrolysis. The thermo-sensitive acidic ionic liquid is acidic ionic liquid which is synthesized from one quaternary ammonium salt of choline, choline chloride, betaine and dodecyl dimethyl betaine, and one fluorine-containing acidic molecule of tetrafluoroboric acid, trifluoromethanesulfonic acid and bis(trifluoromethane sulfonimide). Without sulfur acid or other strong acid groups, the ionic liquid reduces corrosion of the reaction equipment;moreover, the ionic liquid is easy to separate and recycle, thereby greatly improving the reusability of the liquid acidic catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a temperature-sensitive acidic ionic liquid, which can be used as a two-liquid phase catalyst system to catalyze the hydrolysis of microcrystalline cellulose, and a preparation method of the ionic liquid and its application in microcrystalline cellulose application in the hydrolysis process. Background technique [0002] Cellulose is the most important component of biomass resources, which is mainly composed of glucose through β-1,4 glycosidic bonds. However, due to the rich hydroxyl content of cellulose, cellulose has a complex intramolecular and intermolecular hydrogen bond network structure, which makes cellulose have a high degree of crystallinity and is difficult to dissolve in common solvents such as water. Cellulose is hydrolyzed to glucose, and then the glucose is further catalytically converted by biological and chemical methods to produce biofuels, chemic...

Claims

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Application Information

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IPC IPC(8): B01J31/02C07C51/00C07C59/76C07H1/00C07H3/02
CPCB01J31/0279B01J31/0285C07C51/00C07H1/00C07H3/02C07C59/76
Inventor 牟新东陈公哲王喜成刘晓然刘秀云
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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