Method for catalytically depolymerizing lignin by using MTO (Methyltrioxorhenium) under microwave promoted condition

A technology of methyl rhenium trioxide and catalytic depolymerization, applied in chemical instruments and methods, preparation of carbon-based compounds, preparation of organic compounds, etc., can solve the problems of consuming large external hydrogen sources, destroying benzene rings, increasing costs, etc. , to achieve high atom economy, fast reaction speed and high selectivity

Inactive Publication Date: 2017-05-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Benefits of technology

This patented technology allows for more efficient separation of lighter components from biomass without consuming any energy sources like water vapor or air during processing. It also achieves this process at moderate temperatures (<100 degrees Celsius).

Problems solved by technology

This patented technical solution describes methods for converting biomass residues containing lignins into valuable chemicals through decomposition or reduction chemistry techniques involving specific types of reactants like alcohydroxylic acids and carboxynitrilones. These technologies involve expensive precious metals catalyst systems and solvents, while effective catalyst compositions based on transition elements play crucial roles during these decompositation steps.

Method used

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  • Method for catalytically depolymerizing lignin by using MTO (Methyltrioxorhenium) under microwave promoted condition
  • Method for catalytically depolymerizing lignin by using MTO (Methyltrioxorhenium) under microwave promoted condition
  • Method for catalytically depolymerizing lignin by using MTO (Methyltrioxorhenium) under microwave promoted condition

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preparation example Construction

[0020] Preparation of ionic liquid solvent: refer to literature (C.P.Fredlake, J.M.Crosthwaite, D.G.Hert, S.N.U.K.Aki, J.F.Brennecke, J.Chem.Eng.Data, 2004, 49, 954.; Webb P B, Sellin M F, Kunen T E, et al.J .Am.Chem.Soc.2003,125,15577.) Prepared and purified dozens of ionic liquids with strong dissolving ability of lignin, which are used for the implementation of the patent of the present invention.

[0021] Methyl rhenium trioxide catalyzes the depolymerization of lignin model compounds and organic lignin under microwave conditions, including

[0022] Include the following steps:

[0023] ① Lignin model compound or organic lignin and catalyst are preheated and dissolved in ionic liquid at 80°C to 120°C;

[0024] ②Transfer the aforementioned mixture to a microwave reaction system and react under microwave radiation conditions. The rated power used for microwave radiation is 240W, and the reaction time is 2 minutes;

[0025] ③ after the reaction finishes, extract the reactio...

Embodiment 1

[0028] 1 gram of ionic liquid 1-butyl-3-methylimidazole bistrifluoromethylsulfonimide [C 4 MIm]NTf 2, 50 mg lignin model compound β-O-4: 2-(2-methoxyphenoxy)-1-phenylethanol, and 2.5 mg catalyst methyl rhenium trioxide were heated to 80 ℃, fully dissolved; transfer the liquid material to a microwave reaction system, and react under microwave radiation (power 240W) for 2 minutes; cool the reaction mixture to room temperature, dilute to 25 ml with a solution of acetonitrile: water 6:4 , into the liquid chromatography analysis, the conversion rate is 98%, the yield of guaiacol is 69%, and the yield of phenylacetaldehyde is 64%.

Embodiment 2-3

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

[0031] Table 1. Depolymerization of lignin model compounds under different reaction time conditions

[0032]

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Abstract

The invention discloses a method for catalytically depolymerizing lignin by using MTO (Methyltrioxorhenium) under a microwave promoted condition, and relates to a novel method for converting a lignin beta-O-4 model compound and a lignin raw material into a corresponding aromatic compound under a microwave irradiation condition by taking the MTO as a catalyst and ionic liquid as a reaction medium. The method comprises the following steps: adding the catalyst and a lignin oligomer in the ionic liquid, preheating and dissolving, feeding into a microwave reaction system, reacting for two minutes under the microwave irradiation condition, and efficiently and quickly depolymerizing the lignin, thus obtaining a monophenol compound. Compared with a traditional lignin depolymerization method, the method has the distinct characteristics that additional addition of a hydrogen source and an oxygen source is not required, the reaction condition is mild, the selectivity of monophenol products is high, the reaction speed is fast, and environment friendliness is realized. According to the method disclosed by the invention, a mild depolymerization strategy without consuming the hydrogen source is developed for preparation of aromatic chemicals by starting from a reproducible lignin resource, and meanwhile, a new path is developed for producing the aromatic compound through a non-petroleum route.

Description

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Claims

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Application Information

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Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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