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A method for photocatalytic oxidation degradation of lignin and its model compounds

A model compound, photocatalytic oxidation technology, applied in the field of biomass, can solve the problems of difficult operation and high energy consumption, and achieve the effect of high efficiency reaction activity

Active Publication Date: 2021-01-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some oxidation reactions need to be carried out at higher air or oxygen pressure (≥1MPa) and higher temperature (>100°C), which requires high energy consumption and difficult operation

Method used

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  • A method for photocatalytic oxidation degradation of lignin and its model compounds
  • A method for photocatalytic oxidation degradation of lignin and its model compounds
  • A method for photocatalytic oxidation degradation of lignin and its model compounds

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] To the dried 500mg ionic liquid [CPMim]NTf 2 Add 10mg [PrSO 3 HMim]OTf, 10mg lignin model compound A 1 and 20mg of deionized water, under normal pressure air conditions, natural light irradiation, magnetic stirring at 80°C for 1.5h, after the reaction, add 4×2mL methyl tert-butyl ether to the system for extraction and separation. The extracted product was qualitatively and quantitatively analyzed by ultra-high performance liquid chromatography. The analysis results showed that A 1 There is almost no conversion, no phenol and benzoic acid are formed.

Embodiment 2

[0033] To the dried 500mg ionic liquid [CPMim]NTf 2 Add 10mg [PrSO 3 HMim]OTf, 10mg lignin model compound A 2 and 20mg of deionized water, under normal pressure air conditions, natural light irradiation, magnetic stirring at 80°C for 1.5h, after the reaction, add 4×2mL methyl tert-butyl ether to the system for extraction and separation. The extracted product was qualitatively and quantitatively analyzed by ultra-high performance liquid chromatography. The analysis results showed that the conversion rate of lignin model compounds was 72.7%, and the yields of benzoic acid and phenol were 59.8% and 71.4%, respectively.

Embodiment 3

[0035] To the dried 500mg ionic liquid [CPMim]NTf 2 Add 10mg [PrSO 3 HMim]OTf, 10mg lignin model compound A 2 And 5mg deionized water, under normal pressure air conditions, 254nm wavelength light source irradiation, the radiation energy is 500μW / cm 2 , magnetically stirred at 80°C for 1.5h, after the reaction, 4×2mL methyl tert-butyl ether was added to the system for extraction and separation. The extracted product was qualitatively and quantitatively analyzed by ultra-high performance liquid chromatography. The analysis results showed that the conversion rate of lignin model compounds was 92.6%, and the yields of benzoic acid and phenol were 52.2% and 86.0%, respectively.

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Abstract

The invention discloses a method for degrading lignin and model compound thereof through photocatalytic oxidation in a binary ionic liquid system, under a mild condition and by a one-pot method. In the method, binary ionic liquid comprises disubstituted imidazole ionic liquid and sulfo functionalized imidazole ionic liquid. The method is characterized in that the lignin model compound can be oxidatively degraded under the condition of low temperature (below 100 DEG C), atmospheric air and natural visible light irradiation, the highest conversion rate is 98.3%, products are benzoic acid and phenol, and the highest yields are 91.7% and 76.8% respectively; the natural lignin is oxidatively degraded to obtain acidic, phenolic and aldehydic aromatic products such as 4-ethylbenzoic acid, phloroglucinol and 4-methylphenylacetaldehyde. The method is environment-friendly and high-efficiency, the used ionic liquid can be recycled, the reaction operation condition is mild, the energy consumptionis low, and a technology is environment-friendly and safe; by the method, the problems of high energy consumption, high temperature, high pressure and a strict reaction condition in the conventional lignin oxidation method and the like are solved, and a novel method support is provided for industrialization of biomass degradation.

Description

technical field [0001] The invention relates to a method for using a binary ionic liquid system to degrade lignin and lignin model compounds by photocatalytic oxidation under mild conditions, belonging to the field of biomass. Background technique [0002] Lignin is a renewable resource with low price and rich sources. It constitutes the main component of plant skeleton with cellulose and hemicellulose. It is rich in aromatic hydrocarbon structure and is one of the few that can provide renewable aromatic compounds. Therefore, the use of lignin to replace petroleum coal to produce biodiesel, phenols, aldehydes, acids and other products has become a subject of increasing concern. However, lignin has not been used reasonably and effectively. At present, a very small amount of lignin (accounting for 1%-2% of the total amount) is recovered from papermaking waste liquid, and it is used as adhesive and concrete reducing agent after appropriate chemical modification. In addition to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C39/04C07C37/00C07C63/06C07C51/245C07C47/542C07C63/04C07C43/23C07C43/205C07C49/84C07C39/10
CPCC07C37/004C07C39/10C07C43/205C07C43/23C07C47/542C07C49/84C07C51/245C07C63/04
Inventor 吕兴梅康莹徐俊丽辛加余周清董会贤张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI