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Method for preparing aromatic acid ester and aliphatic ester through directional catalytic oxidation of lignin

An oxide and catalyst technology, which is applied in the field of heterogeneous directional catalytic oxidation of lignin, can solve the problems such as the preparation of aromatic esters by heterogeneous catalytic oxidation of lignin, etc., and achieves the effect of low equipment cost

Active Publication Date: 2018-11-23
昌吉学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no patent on the preparation of aromatic esters and fatty acid esters by multi-phase catalytic oxidation of lignin

Method used

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  • Method for preparing aromatic acid ester and aliphatic ester through directional catalytic oxidation of lignin
  • Method for preparing aromatic acid ester and aliphatic ester through directional catalytic oxidation of lignin
  • Method for preparing aromatic acid ester and aliphatic ester through directional catalytic oxidation of lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Preparation of cerium oxide nanorods: 3.47 g of cerium nitrate hexahydrate was dissolved in 20 mL of deionized water, added to a 200 mL polytetrafluoroethylene liner, equipped with magnets, placed on a magnetic stirrer, and started to stir. Dissolve 50.4 g of sodium hydroxide in 140 mL of deionized water (9 mol / L), then add the sodium hydroxide solution dropwise to the cerium nitrate solution, after the addition of the sodium hydroxide solution is completed, continue to stir at room temperature for half an hour . After the stirring, put the polytetrafluoroethylene liner into the stainless steel reaction kettle, seal the reaction kettle, put it in an oven, and react at 100 °C for 72 h. After the reaction, cool to room temperature, the solution is centrifuged by a centrifuge to separate the solid, and the obtained solid is washed 5 times with deionized water and absolute ethanol respectively. The solid was dried in an oven overnight, and then calcined in a muffle furnace...

Embodiment 2

[0017] Preparation of cerium oxide nanospheres: Take 1.736 g of cerium nitrate hexahydrate and 0.294 g of trisodium citrate, dissolve them in 160 mL of deionized water, place them in a 200 mL polytetrafluoroethylene liner, configure magnets, and place them on a magnetic stirrer On, start stirring. Stir at room temperature for half an hour. After the stirring, put the polytetrafluoroethylene liner into a stainless steel reaction kettle, seal the reaction kettle, put it in an oven, and react at 200°C for 24 hours. After heating, cool to room temperature, the solution is centrifuged to separate the solid, and the obtained solid is washed 5 times with deionized water and absolute ethanol respectively. The solid was dried in an oven overnight, and then calcined in a muffle furnace at 500 °C for 3 h.

Embodiment 3

[0019] Preparation of cerium oxide nano-squares: 3.47 g of cerium nitrate hexahydrate was dissolved in 20 mL of deionized water, placed in a 200 mL polytetrafluoroethylene liner, equipped with magnets, placed on a magnetic stirrer, and started to stir, 33.6 g Sodium hydroxide was dissolved in 140 mL deionized water (6 mol / L), and then the sodium hydroxide solution was added dropwise to the cerium nitrate solution. After the sodium hydroxide solution was added dropwise, the stirring was continued for half an hour at room temperature, and the stirring was completed. Finally, put the polytetrafluoroethylene liner into a stainless steel reaction kettle, seal the reaction kettle, put it in an oven, and react at 100 °C for 24 h. After heating, cool to room temperature, the solution is centrifuged to separate the solid, and the obtained solid is washed 5 times with deionized water and absolute ethanol respectively. The solid was dried in an oven overnight, and then calcined in a muff...

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Abstract

Lignin is a unique reproducible aromatic compound source in the nature; the yield is huge, but the structure is complicated, so that the directional depolymerization is difficult; the utilization degree at present is not high. The method for preparing the aromatic compound through catalytic oxidation of lignin has the main step of dissolving the lignin into a sodium hydroxide water solution; the corrosion on equipment is serious; the waste liquid cannot be easily treated; the environment pollution can be easily caused. The invention provides a method of using the special structure and effect relationship of the rare-earth nanometer metal oxide, directly using agricultural stalks as raw materials under the relatively mild conditions, performing catalytic oxidization on the lignin by a one-pot method to obtain high-added-value products of benzenedicarboxylic acid dimethyl ester, dimethyl succinate and the like. After the separation, the benzenedicarboxylic acid dimethyl ester can be usedfor obtaining phthalic acid through hydrolysis reaction, and becomes a raw material for producing PBT and PET. The method has the advantages that the operation is performed in neutral environment such as organic alcohol; no corrosion is caused on the equipment; the equipment production cost is low. Solvents and catalysts can be recovered by a simple method and can be circularly utilized; the massdischarge into the environment is not needed; the green and environmental-friendly effects are achieved.

Description

technical field [0001] The invention relates to a new method for heterogeneous directional catalytic oxidation of lignin, which uses a one-pot method to directly convert agricultural straw into high value-added products such as aromatic acid esters and fatty acid esters, and belongs to the technical field of biomass chemical industry. Background technique [0002] Lignin is a three-dimensional network polymer connected by phenylpropanyl groups through C-C bonds or C-O bonds. The structure diagram is as follows figure 1 As shown, it is the only renewable biomass resource containing aromatic compounds known on earth. At present, lignin mainly comes from the pulp and paper industry. Taking China as an example, about 70 million tons of by-product lignin are produced every year, and more than 98% of lignin is treated as waste and discharged with papermaking "black liquor". Less than 2% of lignin is used as low calorific value fuel, causing serious waste of resources and environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/00C07C69/36C07C69/40C07C69/80C07C69/82C07C69/708C07C69/78
CPCC07C67/00C07C69/36C07C69/40C07C69/80C07C69/82C07C69/708C07C69/78Y02P20/584
Inventor 张宏喜刘天祥耿莉莉
Owner 昌吉学院
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