Method for preparing aromatic compounds employing catalytic cracking of industrial lignins

A technology for aromatic compounds and industrial lignin, applied in chemical instruments and methods, preparation of organic compounds, preparation of ethers, etc., can solve the problems of reduced catalyst activity, difficult catalytic hydrogenation reaction, poisoning of hydrogenation catalysts, etc. High conversion rate, the effect of alleviating the tension of petroleum resources and mild conditions

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

The presence of this element makes the hydrogenation catalyst poisoned seriously in the process of converting industrial lignin (Pacific Pulp and Paper Industry, 1942, 16, 23-26.), and the activity of the catalyst decreases rapidly, making it difficult to catalyze the hydrogenation reaction. conduct

Method used

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  • Method for preparing aromatic compounds employing catalytic cracking of industrial lignins
  • Method for preparing aromatic compounds employing catalytic cracking of industrial lignins
  • Method for preparing aromatic compounds employing catalytic cracking of industrial lignins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 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, hydrogen reduction was carried out at 450° C. in a quartz tube for 2 hours. Metal salts such as Ni, La, Ce, Al, Co, Fe, Cr, Zn and Cu used in preparing the catalyst are metal nitrates, Mo salts are ammonium molybdate, and Mn and Sn salts are metal chlorides.

Embodiment 2

[0029] The preparation process of the catalyst was carried out by the method of Example 1, except that different metal components and mass ratios and different supports were changed. See Table 1 for details.

[0030] Table 1

[0031]

[0032] Example 2

[0033] Mix 2g of sodium lignosulfonate and 120ml of ethylene glycol and stir at room temperature for 30 minutes, add 0.1g (calculated based on the total mass of metal) of the catalysts shown in the table below and transfer them to the autoclave. After replacing the air with nitrogen for 3-5 times, heat to 200 ° C, then fill with reaction gas, the partial pressure of hydrogen is 5MPa, stir rapidly, and the reaction starts. 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 rea...

Embodiment 3

[0037] The catalytic cracking reaction of embodiment 3 sodium lignosulfonate

[0038] Mix 2g of sodium lignosulfonate and 120ml of solvent at room temperature and stir for 30 minutes, then add 0.1g (calculated based on the total mass of metal) of NiFe / ZrO with a metal loading of 10%. 2 The catalyst was transferred to the autoclave. After replacing the air with nitrogen for 3-5 times, heat to 200°C, then fill with reaction gas, hydrogen partial pressure is 5MPa, stir rapidly, and the reaction starts. After reacting for 6 hours, the stirring was stopped, the temperature was lowered to room temperature, the hydrogen was evacuated, and samples were taken for analysis. Analysis method is with embodiment 2.

[0039] table 3

[0040]

[0041]

[0042] It can be seen from the table that the reaction system with reducing ability, typically such as polyols and amides, can reduce the poisoned catalyst in situ, showing considerable activity, while in the system without reducing a...

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Abstract

The invention relates to a method for preparing aromatic compounds employing direct catalytic cracking of industrial lignins under a catalytic system with reducing capacity. The method comprises the following steps: selectively cracking industrial lignins such as sodium lignin sulfonate, alkali lignin, dealkalized lignin and the like as raw materials under combined action of a catalyst and a solvent with reducing capacity to obtain derived C6-C9 phenolic, guaiacol or syringyl aromatic compounds and the like by the effect of in-situ reduction of a poisoned catalyst, wherein the conversion rate of the raw materials can be over 50%; the content of guaiacol and syringyl aromatic compounds in a split product can be over 70%. By adopting the method related to the invention, the problem that the catalyst is poisoned by reaction materials is overcome, so that the catalytic process can be smoothly carried out; the method has the characteristics of low price and high conversion efficiency of raw materials, high yield of the aromatic compounds and mild reaction condition.

Description

technical field [0001] The invention relates to a method for producing aromatic compounds by catalytic hydrocracking of industrial lignin under a catalytic system that can regenerate poisoned catalysts in situ, especially a method for catalytic cracking of lignosulfonate to generate phenol group, guaiacol group or purple The method of aromatic compounds such as syringyl. Background technique [0002] Lignin is a renewable resource abundant in nature and the second major component of biomass. It is estimated that the annual natural lignin production in my country is 150 billion tons. The characteristic structure of lignin is a C9 phenylpropane basic unit containing a benzene ring, and it is currently a resource library of naturally synthesized benzene rings in nature. Through reasonable utilization, the bulk chemical benzene and its derivatives that are currently in demand by society can be obtained. Benzene and its derivative chemicals are currently synthesized from fossi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/23C07C41/00
CPCC07C41/01C07C43/23
Inventor 徐杰宋奇王峰于维强路芳苗虹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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