Method for lignin aryl-ether bond catalytic pyrolysis with ReO<x>/AC

A technology of catalytic cracking and aryl ether, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of consuming large external hydrogen sources and destroying benzene rings , increase costs and other issues, to achieve the effect of high atom economy, mild conditions, and high selectivity

Active Publication Date: 2017-12-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

On the other hand, the hydrogenolysis process needs to consume a large amount of external hydrogen sources, which increases the cost to a certain extent
For the catalytic oxidative degradation of lignin, organometallic catalysts have high activity, similar to the hydrogenolysis process. In the oxidation reaction, due to the presence o...

Method used

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  • Method for lignin aryl-ether bond catalytic pyrolysis with ReO&lt;x&gt;/AC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 100 mg lignin model compound 2-(2-methoxyphenoxy)-1-phenylethanol, 100 mg catalyst ReO x / AC(1wt%ReO x ), 15 milliliters of isopropanol was added into a 75 milliliter reaction kettle, and after passing through nitrogen to replace the gas three times, nitrogen was filled to 0.7 MPa, and the temperature was raised to 190° C. for 3 hours of reaction. After the reaction was finished, it was cooled to room temperature, and the centrifuged supernatant was subjected to chromatographic analysis. The conversion rate was 99.9%, the yield of ethylbenzene was 83.6%, and the yield of guaiacol was 85.0%.

Embodiment 2-6

[0025] Other process conditions and experimental steps are the same as in Example 1, but use different initial pressures, the results are shown in Table 1

[0026] Table 1. At different initial pressures, ReO x / AC(1wt%ReO x ) catalytic conversion of lignin experimental results

[0027] project

[0028] As shown in Table 1, as the initial pressure increased, the yields of guaiacol and ethylbenzene increased.

Embodiment 7-11

[0030] Other processing conditions and experimental steps are the same as in Example 1, but using different reaction temperatures, the results are shown in Table 2.

[0031] Table 2. ReO at different reaction temperatures x / AC(1wt%ReO x ) catalytic conversion of lignin experimental results

[0032] project

[0033] As shown in Table 2, as the reaction temperature increased, the yields of guaiacol and ethylbenzene also increased, and the conversion rate also increased.

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Abstract

The invention provides a new method for converting a lignin model compound dimer and a lignin raw material to a corresponding aromatic compound through a hydrogen transfer reaction by taking ReO<x>/AC as a catalyst. According to the method, one or two micromolecular alcohol is taken as a reaction regent, ReO<x>/AC is taken as a catalyst, and the lignin model compound and the lignin raw material are catalyzed and converted to a micromolecular aromatic chemical in a mild condition. Compared with a traditional lignin depolymerization method, the method has distinct features: no addition of hydrogen and oxygen sources, mild reaction conditions, high selectivity of monophenol products, fast reaction speed, recyclable catalyst, and simple operation. The aromatic chemicals can be prepared from renewable lignin sources, a mild depolymerization strategy without consuming hydrogen sources is developed, and a new approach is developed for producing an aromatic compound in a non-petroleum route.

Description

technical field [0001] The present invention provides a ReO x / AC is a catalyst, which converts lignin model compound dimers and lignin raw materials into corresponding aromatic compounds through hydrogen transfer reaction. Specifically, one or more of water and organic solvent alcohol is used as a solvent to effectively break the lignin aryl ether bond under the action of a catalyst by generating hydrogen itself. Background technique [0002] The massive consumption of fossil resources has led to the tightening of energy supply and the deterioration of the ecological environment. The transformation and utilization of biomass resources is one of the important ways to solve energy and environmental problems, which has attracted great attention from all over the world (Chem.Soc.Rev.2011,40,5588 ). Since the "Eleventh Five-Year Plan", my country's biomass energy utilization technology has made significant progress. Breakthroughs in key technologies such as microbial control ...

Claims

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Application Information

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IPC IPC(8): C07C41/01C07C43/23C07C1/20C07C15/073C07C15/04C07C37/52C07C39/04B01J23/36
CPCB01J23/36C07C1/20C07C37/52C07C41/01C07C2523/36C07C43/23C07C15/073C07C15/04C07C39/04Y02P20/52Y02P20/584
Inventor 张涛张波李昌志郭海威代弢祁早娟王爱琴
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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