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Method for depolymerizing lignin into aromatic compounds under conditions of no additional hydrogen

A technology for aromatic compounds and lignin, applied in organic chemistry, ether preparation, etc., can solve the problems of high risk factor and harsh conditions, and achieve the effect of high safety factor, mild reaction conditions and good atom economy.

Inactive Publication Date: 2014-01-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, most hydrogenation reactions are carried out at relatively high temperature and hydrogen pressure, the conditions are harsh, and the risk factor of the reaction is high. Therefore, it is of great significance to develop a method for hydrogenating lignin without generating hydrogen pressure.

Method used

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  • Method for depolymerizing lignin into aromatic compounds under conditions of no additional hydrogen
  • Method for depolymerizing lignin into aromatic compounds under conditions of no additional hydrogen
  • Method for depolymerizing lignin into aromatic compounds under conditions of no additional hydrogen

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh 1 gram of nickel nitrate and dissolve it in 100 milliliters of water, add dried activated carbon (according to the loading amount of Ni is 8wt%), impregnate for 24 hours, and dry for 12 hours. Then, under the protection of nitrogen, calcined at 400° C. for 3 hours in a quartz tube. Afterwards hydrogen reduction was performed at 450 °C for 3 h. As the precursor of the metal component of the catalyst, metal nitrates are used for Ni, Al, Co, La, Ce, Cr, Zn, Fe, Cu and other metal salts, ammonium molybdate is used for Mo salt, and metal chloride salt is used for Mn and Sn salts.

Embodiment 2

[0028] Weigh 1 gram of nickel nitrate and dissolve it in 100 milliliters of water, add dried activated carbon (according to the loading amount of Ni is 5 wt%), impregnate for 24 hours, and dry for 12 hours. Then, under the protection of nitrogen, it was reduced by activated carbon at 450°C in a quartz tube for 3 hours.

Embodiment 3

[0030] The preparation process of the catalyst was carried out by the method of Example 1 (marked as a) or Example 2 (marked as b), except that different metal components and mass ratios and different supports were changed.

[0031] See Table 1 for details.

[0032] Table 1

[0033]

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Abstract

The invention relates to a method for depolymerizing lignin into aromatic compounds under the conditions of no additional hydrogen. According to the method, biomass-base alcohol compound reformation hydrogen production reaction and lignin hydrodepolymerization reaction are combined; and in the reaction process, the biomass-base alcohol compounds are subjected to in-situ reformation hydrogen production, and meanwhile, the hydrogen is used for hydroepolymerizing lignin. The lignin is selectively cracked into C6-C9 aromatic compounds of phenolic group, guaiacol group, lilac group or other derivatives under the action of the catalyst. The conversion rate of the raw materials is up to higher than 50%, and the content of the guaiacol-group and lilac-group aromatic compounds in the cracked product can reach higher than 90%. The method uses the hydrogen prepared by biomass-base alcohol in-situ reformation as the hydrogen source, and avoids using high-pressure hydrogen in the preparation route; and thus, the method has the characteristics of high safety coefficient in the reaction process, high yield of the aromatic compounds, and mild reaction conditions.

Description

technical field [0001] The invention relates to a method for in situ hydrogenation of lignin into aromatic compounds by hydrogen prepared by in situ reforming of hydroxyl compounds under the condition of no external hydrogen, especially a method of catalytic cracking of lignin to generate phenol group and guaiacol group Or the method of aromatic compounds such as syringyl. Background technique [0002] Lignin is a three-dimensional network polymer formed by the random polymerization of the C9 basic unit of phenylpropane under the action of enzymes in plants. Together with cellulose and hemicellulose, it constitutes the main structure of plants, that is, lignocellulose, weight In terms of energy, it accounts for 15% to 35% of lignocellulose, and in terms of energy, it stores about 40% of the energy of the plant body. Among the three major components of biomass, lignin is the only natural resource containing a benzene ring structure that exists in large quantities in nature, ...

Claims

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Application Information

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IPC IPC(8): C07C43/23C07C41/01
CPCC07C41/01C07C43/23
Inventor 徐杰宋奇王峰苗虹蔡嘉莹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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