Method for preparing guaiacol and phenol by microwave-assisted depolymerization of lignin

A microwave-assisted, guaiacol technology, applied in the fields of biomass energy and chemicals, can solve the problems of low controllability of product components, high cost input, and low conversion product yield, and achieve utilization value and economical efficiency. The effect is good, the side reaction is reduced, and the heat transfer efficiency is improved.

Active Publication Date: 2021-06-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A certain degree of degradation of lignin can be achieved by means of thermochemical conversion. However, at present, there are problems such as low degradation efficiency, serious charring phenomenon, low conversion product yield, and difficult product collection, which seriously restrict lignin. Efficient transformation and utilization of nutrients
[0004] At present, most researches realize the degradation of lignin under high pressure, high temperature and a large amount of hydrogen atmosphere, but the high cost input and low controllability of product components restrict the development of technology, and the liquid oil obtained by pyrolysis is often as high as above There are hundreds of species, which have caused great obstacles to the purification and application of its high-value components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 3g glycine and 15gFe(NO 3 ) 3 ·7H 2 O was dissolved in a mixture of 1000 mL of ethanol and water (the volume ratio of ethanol and water was 1:2), hydrothermally reacted at 150°C for 12 hours, washed with ethanol and distilled water three times after cooling to room temperature, and then dried at 50°C. Dry in oven for 8 hours to get Fe 2 o 3 nanospheres; 1 g of alkali lignin was dissolved in 1000 mL of THF, and then 2 g of Fe obtained above was added 2 o 3 After fully stirring the nanospheres for 3 hours, place them in a dialysis bag with a molecular weight cut-off of 8000, put the dialysis bag into deionized water, stir slowly in a fume hood and dialyze for 24 hours to obtain core-shell Fe 2 o 3 @Lignin was washed 4 times with absolute ethanol and dried at 100°C for 12 hours to obtain dry core-shell Fe 2 o 3 @Lignin; add 1g of ammonium molybdate and 5g of thiourea into 150mL of deionized water and mix evenly, stir at 60°C for 6 hours, then add oxalic acid, adjus...

Embodiment 2

[0041] 3g glycine and 30gFe(NO 3 ) 3 ·7H 2 O was dissolved in a mixture of 500 mL of ethanol and water (the volume ratio of ethanol and water was 1:2), hydrothermally reacted at 180°C for 12 hours, washed with ethanol and distilled water for 4 times after cooling to room temperature, and then dried at 80°C. Dry in oven for 6 hours to get Fe 2 o 3 Nanospheres; 1 g of solvent lignin was dissolved in 200 mL of THF, and then 0.5 g of Fe obtained above was added 2 o 3 After fully stirring the nanospheres for 3 hours, place them in a dialysis bag with a molecular weight cut-off of 14,000, put the dialysis bag into deionized water, stir slowly in a fume hood and dialyze for 36 hours to obtain core-shell Fe 2 o 3 @Lignin was washed 6 times with absolute ethanol and dried at 80°C for 12 hours to obtain dry core-shell Fe 2 o 3 @Lignin; add 1g of ammonium molybdate and 2g of thiourea into 80mL of deionized water and mix evenly, stir at 50°C for 6 hours, then add oxalic acid, adju...

Embodiment 3

[0043] 3g glycine and 24gFe(NO 3 ) 3 ·7H 2 O was dissolved in a mixture of 750 mL of ethanol and water (the volume ratio of ethanol and water was 1:2), hydrothermally reacted at 200 ° C for 12 hours, washed with ethanol and distilled water for 5 times after cooling to room temperature, and then dried at 60 ° C Dry in oven for 7 hours to get Fe 2 o 3 Nanospheres; 1 g kraft lignin was dissolved in 500 mL THF, and then 1 g Fe obtained above was added 2 o 3 After fully stirring the nanospheres for 3 hours, place them in a dialysis bag with a molecular weight cut-off of 10,000, put the dialysis bag into deionized water, stir slowly in a fume hood and dialyze for 48 hours to obtain core-shell Fe 2 o 3 @Lignin was washed 5 times with absolute ethanol and dried at 90°C for 12 hours to obtain dry core-shell Fe 2 o 3 @Lignin; Add 1g of ammonium molybdate and 3g of thiourea into 100mL of deionized water and mix evenly, stir at 40°C for 6 hours, then add oxalic acid, adjust the pH...

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Abstract

The invention discloses a method for preparing guaiacol and phenol by microwave-assisted depolymerization of lignin. A microwave reaction body with a sandwich structure is designed by compounding a microwave absorption medium, lignin and a catalyst, so that the contact area between lignin and the catalyst and the microwave absorption medium is greatly increased, and the generation of side reaction is reduced. The method has positive significance in controlling a directional regulation mechanism for converting lignin into high-value guaiacol and phenol.

Description

technical field [0001] The invention belongs to the technical field of biomass energy and chemicals, in particular to a method for preparing guaiacol and phenol through microwave-assisted depolymerization of lignin. Background technique [0002] Lignin is one of the important components of biomass and the second most abundant biopolymer on earth after cellulose. In addition to the huge reserves in nature, lignin is also the main by-product of the pulp and paper industry. The pulp and paper industry produces about 50 million tons of lignin every year, but only about 2% of the lignin is separated for various products. Most are discarded as waste, or burned to recover heat and generate electricity, resulting in a great waste of resources. It is precisely because of this that it is imperative to find new high value-added applications for lignin. [0003] Lignin has both carbon chains and aromatic rings in its structure, and is connected with methoxyl groups (-OCH 3 ), hydroxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/00C07C41/01C07C43/23C07C39/04B01J27/051
CPCC07C41/01C07C37/004C07C37/005B01J27/0515C07C43/23C07C39/04Y02P20/52
Inventor 王文亮黄佳乐马振浩薛白亮游翔宇段超李金宝李新平
Owner SHAANXI UNIV OF SCI & TECH
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