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Method for catalyzing lignin to select depolymerization by using non-precious metals

A non-precious metal and lignin technology, applied in the field of Mn complex catalysts, can solve the problems of consuming hydrogen or oxygen sources, harsh reaction conditions, and polluting the environment, and achieve the effects of low cost, mild reaction conditions, and pollution reduction

Active Publication Date: 2018-06-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The world patent (WO99 / 10450) uses alkali-catalyzed hydrogenation of lignin to prepare gasoline components in a hydrogen atmosphere at 260-310°C, but complete hydrogenation of benzene rings requires more hydrogen sources, and the alkali catalyst produces a large amount of waste liquid, polluting the environment
U.S. Patent (US 4,900,873) uses biphenyl or naphthalene as a solvent to pyrolyze lignin to prepare aromatic compounds at 300-400°C, but the yield is less than 20%
According to the research results of the literature, currently reported lignin hydrodepolymerization and oxidative depolymerization mostly use noble metals such as Pd and Pt as catalysts, and the reaction conditions are relatively harsh. source

Method used

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  • Method for catalyzing lignin to select depolymerization by using non-precious metals
  • Method for catalyzing lignin to select depolymerization by using non-precious metals
  • Method for catalyzing lignin to select depolymerization by using non-precious metals

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] M(mpo) n The specific preparation method of the complex catalyst (M=Fe, Co, n=3; M=Ni, n=2) is as follows:

[0025] Fe(mpo) 3 Preparation: 1.0g anhydrous ferrous chloride, 3.0g 2,2'-dithiobis(pyridine-1-oxide), 0.43g sodium methoxide in 200ml methanol, stirred at room temperature for 30h, filtered after the reaction, blue The brown filtrate was refrigerated overnight at 5°C to obtain crystals, the liquid was separated, the collected crystals were dried in vacuum to obtain 2.41g of brown solid catalyst Fe(mpo) 3 , Yield: 70%.

[0026] Co(mpo) 3 Preparation: 2.0g of anhydrous cobalt chloride, 2.3g of 2-mercaptopyridine sodium salt were stirred in 300ml of tetrahydrofuran at room temperature for 24h, then filtered, and the brown-green filtrate was refrigerated at 5°C overnight to obtain crystals, the liquid was separated, and the crystals were collected Vacuum drying to get 5.28g solid catalyst Co(mpo) 3 , mol yield: 77%.

[0027] Ni(mpo) 2 Preparation: 0.38 g of 2,...

Embodiment 2-10

[0029] M(mpo) n The complex catalyzes the depolymerization reaction of the lignin model molecule 2-(2-methoxyphenoxy)-1-phenylethanol: mix 50mg lignin model molecule with M(mpo) n 5 mg of the complex was dissolved in 10 ml of methanol respectively, replaced with nitrogen five times, and then the reaction vessel was sealed under normal pressure and heated to 80°C-200°C, and the reaction was stirred at 1000 rpm for 4h-24h. After the reaction was completed, the temperature was lowered to room temperature, and the supernatant was filtered and then sampled for analysis. Qualitative analysis of the product was carried out by GC-MS technology and standard sample control, and quantitative analysis was realized by gas chromatography internal standard method. The reaction results are shown in Table 1.

[0030] Table 1 M(mpo) under different conditions n Depolymerization results of the complex catalyzed lignin model molecule 2-(2-methoxyphenoxy)-1-phenylethanol

[0031]

[0032] A...

Embodiment 11-16

[0034] Ni(mpo) 2 Catalyze the depolymerization reaction of lignin model molecule 2-(2-methoxyphenoxy)-1-phenylethanol under different conditions: a certain mass of lignin model molecule and M(mpo) n The complexes were respectively dissolved in 30ml of methanol, replaced with nitrogen for five times, then filled with nitrogen to the set pressure, the temperature of the reactor was raised to 150°C, and the stirring reaction was carried out at a speed of 1000 rpm for 24 hours. After the reaction was completed, the temperature was lowered to room temperature, and the supernatant was filtered and then sampled for analysis. Qualitative analysis of the product was carried out by GC-MS technology and standard sample control, and quantitative analysis was realized by gas chromatography internal standard method. The reaction results are shown in Table 2.

[0035] Table 2 Ni(mpo) under different conditions 2 Depolymerization results of the complex catalyzed lignin model molecule 2-(2-...

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Abstract

The invention relates to a method for preparing an aromatic compound by catalyzing lignin to select depolymerization. The method comprises the following steps: taking an M(mpo)n complex (M=Fe, Co, n=3; M=Ni, n=2) as a catalyst, taking various beta-O-4 model molecules, organic lignin, lignosulfonate and alkali lignin as raw materials, and realizing high-selectivity catalytic cracking aryl-ether bands in a nitrogen atmosphere of 0.1 MPa at the temperature of 80 to 200 DEG C so as to obtain a phenolic compound. The conversion rate of the beta-O-4 model molecules reaches 100% at most, the productive rate of guaiacol reaches 95% at most, and the yield of styrene reaches 71% at most; when different lignins are used as raw materials for conversion, the yield of aromatic biological oil is 34% to 71%. The method has the characteristics of mild reaction conditions, no consumption of hydrogen source, high activity and selectivity, environment-friendly reaction process and the like.

Description

technical field [0001] The present invention relates to the preparation of aromatic compounds by depolymerization of lignin, specifically a kind of M(mpo) without consuming hydrogen source and oxygen source n A complex catalyst (M=Fe, Co, n=3; or M=Ni, n=2) catalyst catalyzes the method for cracking lignin resources to prepare phenolic aromatic compounds. Background technique [0002] The rapid development of the world economy has benefited from the wide application of fossil energy. With the continuous consumption of fossil resources, the energy crisis and environmental problems are becoming more and more serious. The development of renewable new energy to replace fossil resources has become an inevitable trend of sustainable social development. [0003] Biomass resources are the most abundant and cheapest renewable resources that meet the requirements of sustainable development on the earth. Among the components of biomass, the content of lignin is second only to cellul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/54C07C39/04C07C41/01C07C43/23C07C43/205C07C43/215C07C1/20C07C15/073C07C15/46B01J31/22
CPCB01J31/226B01J2531/0213B01J2531/0241B01J2531/842B01J2531/845B01J2531/847C07C1/20C07C37/54C07C41/01C07C39/04C07C43/23C07C43/205C07C43/215C07C15/073C07C15/46Y02P20/52
Inventor 李昌志郭海威王爱琴张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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