Method for preparing aromatic compound by catalytic hydrocracking of lignin

An aromatic compound, catalytic cracking technology, applied in the preparation of organic compounds, chemical instruments and methods, ether preparation and other directions, can solve the problems of difficult catalytic reaction, difficult separation and purification, harsh reaction conditions, etc., and achieve high conversion rate of aromatic compounds. , the effect of alleviating the tension of petroleum resources and mild reaction conditions

Inactive Publication Date: 2010-07-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The reaction conditions of the process are harsh, and the temperature and pressure are too high
Chinese patent (CN 1201778A) describes a method for obtaining syringaldehyde and vanillin by oxidizing alkali lignin, but the products obtained by this method are other chemicals, and it is impossible to obtain alkyl-substituted guaiacols and lilac Basic aromatic compound products
[0007] 1. Lignin itself is a high polymer, which is usually connected with the sugar group of plant hemicellulose by chemical bonds, which is not easy to separate and purify. At the same time, the curled polymer chain of lignin makes it difficult to carry out the catalytic reaction and presents a chemical reaction inert;
[000...

Method used

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  • Method for preparing aromatic compound by catalytic hydrocracking of lignin
  • Method for preparing aromatic compound by catalytic hydrocracking of lignin
  • Method for preparing aromatic compound by catalytic hydrocracking of lignin

Examples

Experimental program
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Embodiment 1

[0032] 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, it was calcined at 450° C. for 5 hours in a quartz tube.

Embodiment 2

[0034] Catalyst 2-11 was prepared by the method of Example 1. The metals were all added in the form of nitrates, but different metal components and mass ratios and different supports were changed. The total metal loading was 8 wt%. See Table 1 for details.

[0035] Table 1

[0036] Numbering

[0037] Numbering

Embodiment 3

[0038] The catalytic cracking reaction of embodiment 3 natural lignin

[0039]5g of birch powder containing natural lignin and 80ml of equal-proportion mixed solvent or pure solvent were added and 1g of catalyst was added to transfer to the autoclave. After replacing the air with nitrogen for 3-5 times, heat to 200°C, then fill with hydrogen to a pressure of 5MPa, stir rapidly, and the reaction begins. After reacting for 6 hours, the stirring was stopped, the temperature was lowered to room temperature, the hydrogen gas was evacuated, and a sample was taken for analysis. The qualitative analysis of the product was performed by gas chromatography-mass spectrometry, and the quantitative analysis was realized by gas chromatography. The results are shown in Table 2, and the product chromatogram is shown in figure 1 , the three main peaks in the figure are successively internal standards, guaiacylpropane and syringylpropane. The mass spectrum of the three peaks is shown in Figu...

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Abstract

The invention relates to a method for preparing an aromatic compound by direct catalytic cracking of lignin. Under the combined action of a catalyst and a solvent, industrial lignins such as natural lignin, sodium lignin sulfonate, alkali lignin and dealkalized lignin are used as raw materials and are selectively cracked into the aromatic compound derived from C6-C9 phenolic group, guaiacol group or syringyl through the catalytic process. The conversion rate of the raw materials reaches over 50%, and the guaiacol group and the syringyl aromatic compound account for over 90% in a cracking product. The method has the characteristics of cheap raw materials, high conversion rate, high yield of the aromatic compound and mild reaction condition.

Description

technical field [0001] The invention relates to a method for preparing aromatic compounds by catalyzing lignin hydrocracking of biomass resources, in particular to a method for generating aromatic compounds such as phenol, guaiacol or syringyl by catalyzing lignin. Background technique [0002] The continuous development and consumption of petroleum and other fossil resources have resulted in shortages of energy chemicals and a series of environmental problems. The development and utilization of new recyclable resource routes has become an inevitable trend of social development. Biomass is a recyclable natural resource with a wide range of sources and abundant reserves in nature. It is one of the renewable resources with great potential to replace fossil resources such as petroleum. Aromatic compounds have important applications in human production practices. For example, benzene, phenol and their derivatives are not only widely used bulk chemicals, but also important inte...

Claims

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Application Information

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IPC IPC(8): C07C37/52C07C39/02C07C43/23C07C41/01B01J23/755B01J29/072B01J29/83
CPCY02P20/52
Inventor 徐杰宋奇于维强赵静苗虹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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