Catalytic depolymerization of sugarcane bagasse lignin to prepare aromatic oxygenates

A technology for catalytic depolymerization and lignin, which is applied in the field of efficient catalytic conversion and resource utilization of bagasse lignin, can solve problems such as low waste utilization efficiency, and achieve the effects of avoiding resource waste and high catalytic activity.

Active Publication Date: 2021-05-25
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One object of the present invention is to provide a method for producing aromatic group oxygenates by catalytic depolymerization of bagasse lignin, which is used to solve the problem of bagasse waste utilization To solve the problem of low efficiency, convert it into high value-added chemicals such as aromatic oxygenates through chemical methods, so as to realize the recycling and high-value utilization of waste

Method used

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  • Catalytic depolymerization of sugarcane bagasse lignin to prepare aromatic oxygenates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The method for producing aromatic group oxygenates by catalytic depolymerization of sugarcane bagasse lignin:

[0031] Weigh 1.164g Ni(NO 3 ) 2 •6H 2 O, 1.536g Mg(NO 3 ) 2 •6H 2 O, 1.01g Fe(NO 3 ) 3 •9H 2 O was successively dissolved in 50 mL of distilled water, and then 5 mL of absolute ethanol solution was added, and stirred continuously for 30 minutes with a magnetic stirrer. Titrate the above solution with 2mol / L NaOH solution, when the pH value is 11, continue to stir the solution after the titration is completed, so that the solution is fully stirred evenly. After the titration and stirring, the solution was ultrasonically treated in an ultrasonic disperser for 5 minutes. After taking it out, the solution was put into the reactor and reacted for 24 hours at 160°C. After the reaction, the lining of the reactor was taken out, and the separated lower sediment Wash and centrifuge. Centrifuge for 3 minutes each time, the speed of centrifugation is 12000 min / r...

Embodiment 2

[0035] The method for producing aromatic group oxygenates by catalytic depolymerization of sugarcane bagasse lignin:

[0036] Weigh 1.164g Ni(NO 3 ) 2 •6H 2 O, 1.536g Mg(NO 3 ) 2 •6H 2 O, 1.01g Fe(NO 3 ) 3 •9H 2 O was successively dissolved in 50 mL of distilled water, and then 5 mL of ethylene glycol solution was added, and stirred continuously for 30 minutes with a magnetic stirrer. Titrate the above solution with 2 mol / L NaOH solution, when the pH value is 10.5, continue to stir the solution after the titration is completed, so that the solution is fully stirred evenly. After the titration and stirring, the solution was ultrasonically treated in an ultrasonic disperser for 5 minutes. After taking it out, the solution was put into the reactor and reacted for 24 hours at 180°C. After the reaction, the lining of the reactor was taken out, and the separated lower sediment Wash and centrifuge. Centrifuge for 3 minutes each time, the speed of centrifugation is 12000 min / r...

Embodiment 3

[0040] The method for producing aromatic group oxygenates by catalytic depolymerization of sugarcane bagasse lignin:

[0041] Weigh 1.745g Ni(NO 3 ) 2 •6H 2 O, 1.536g Mg(NO 3 ) 2 •6H 2 O, 1.212g Fe(NO 3 ) 3 •9H 2 O was successively dissolved in 50 mL of distilled water, then 5 mL of starch solution was added, and stirred continuously for 30 minutes with a magnetic stirrer. Titrate the above solution with 2 mol / L NaOH solution, when the pH value is 11, continue to stir the solution after the titration is completed, so that the solution is fully stirred evenly. After the titration and stirring, the solution was ultrasonically treated in an ultrasonic disperser for 5 minutes. After taking it out, put the solution into the reactor and react at 180°C for 18 hours. After the reaction, the lining of the reactor was taken out, and the separated lower sediment Wash and centrifuge. Centrifuge for 3 minutes each time, the speed of centrifugation is 12000 min / rev, wash away the ...

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Abstract

The present invention relates to a method for producing aromatic group oxygenates by catalytic depolymerization of sugarcane bagasse lignin. The method for preparing aromatic group oxygenates by catalytic depolymerization of bagasse lignin: 1. Nano-layered NiMgFe hydrotalcite Preparation: 2. Use NiMgFe nano-layered composite metal oxide solid base to catalyze the depolymerization of bagasse lignin to prepare aromatic-based oxygenates; 3. After the catalytic depolymerization reaction, centrifuge to separate the residue and hydrotalcite after the reaction to obtain a liquid phase Crude product; 4. Liquid phase After the crude product is extracted and separated, the extractant is removed by a rotary evaporator to obtain a pure liquid phase product, which is an aromatic oxygen-containing compound. The nano single-layer hydrotalcite catalyst prepared by the co-precipitation hydrothermal synthesis method in the invention has high catalytic activity to bagasse lignin, and the depolymerization rate of bagasse lignin can reach more than 90%.

Description

technical field [0001] The invention relates to the field of high-efficiency catalytic conversion and resource utilization of bagasse lignin, in particular to a method for preparing aromatic oxygen-containing compounds by catalytically depolymerizing bagasse lignin by using nano single-layer NiMgFe hydrotalcite. Background technique [0002] In nature, lignin is the second largest biomass besides cellulose, and according to statistics, the annual regeneration of lignin can reach 5.0×10 10 Ton. Owing to the oxygen-containing functional groups such as phenolic hydroxyl group, aldehyde group, and carboxyl group in its molecular structure, it becomes a renewable resource capable of producing aromatic-based oxygen-containing compounds. A large amount of bagasse waste is produced in the sugar industry, which is mainly used as fuel. Due to its high oxygen content and low calorific value, direct combustion has caused a serious waste of bagasse resources. Through chemical conversio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C27/00C07C37/00C07C41/18C07G1/00B01J37/03B01J37/08B01J37/10B01J23/755
CPCB01J23/002B01J23/78B01J37/03B01J37/08B01J37/10B01J2523/00C07C27/00C07C37/004C07C41/18C07G1/00B01J2523/22B01J2523/842B01J2523/847Y02P20/584
Inventor 韩洪晶李金鑫陈彦广薛峰王园园王海英张永军苑慧敏张懿达
Owner NORTHEAST GASOLINEEUM UNIV
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