High-selective preparation method of aromatic amine by lignin

A technology of lignin and aromatic amines, applied in the field of aromatic amines, can solve problems such as air pollution and achieve low cost effects

Active Publication Date: 2017-05-10
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of aromatic nitro compounds needs to consume a large amount of sulfuric acid or nitric acid as a nitrating agent for aromatic compounds, and the sub...

Method used

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  • High-selective preparation method of aromatic amine by lignin
  • High-selective preparation method of aromatic amine by lignin
  • High-selective preparation method of aromatic amine by lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, a quartz tube reactor with a diameter of 10 mm and a length of 250 mm is used. In the reactor, the catalyst is supported by quartz wool. The quartz reactor is installed in a temperature-controlled furnace. The temperature of the reactor was monitored by a thermocouple inserted into the surface of the packed bed of the temperature-controlled furnace. During operation, use NH 3 , NH 3 / N 2 Or NH 3 The / He mixture is used as the carrier gas, and its flow rate is controlled by a gas flow meter. The powdered raw material flows together with the carrier gas from the opening of the quartz tube to the pyrolysis interface. The reaction temperature is 200-1000°C, and the carrier gas flow rate is 5-200 mL / min. The liquid product flows from the reactor to the condenser, and the gas product is collected in a gas sampling bag. Use gas chromatograph to analyze liquid and gas products.

Embodiment 2

[0037] In this example, different raw materials such as alkali lignin, organic solvent lignin, sodium lignosulfonate, pyrolysis lignin, and bagasse hydrolysis residue were tested to pyrolyze to prepare aromatic amines.

[0038]

[0039] Reaction conditions: reaction temperature is 600°C; catalyst is ZSM-5; ammonia gas flow rate = 40 mL / min.

Embodiment 3

[0041] In this example, the effect of different reaction temperatures on the yield and selectivity of aromatic amines was tested.

[0042]

[0043] Reaction conditions: raw material is organic solvent lignin; catalyst is ZSM-5; ammonia gas flow rate = 40 mL / min.

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Abstract

The application relates to a high-selective preparation method of aromatic amine by lignin. The method includes steps of reacting lignin in a reactor through the catalyzation of catalyst under the heating condition by taking gas containing reactive nitrogen compound as a carrier gas; condensing and collecting fluid product, separating the fluid product and acquiring the aromatic amine. By using the regenerative resource, the aromatic amine is selectively prepared through a proper reaction method. The full process from raw material to production technique is a regenerative, green and environment-friendly line.

Description

Technical field [0001] The invention relates to the field of organic preparation, and particularly relates to a method for aromatic amines. Background technique [0002] Lignin is an amorphous polymer that is widely present in plants and contains oxyphenylpropanol or its derivative structural units in its molecular structure. It is the second largest reserve in nature after cellulose. Large renewable resources are also the only non-petroleum resources in nature that can provide large amounts of renewable aryl compounds. [0003] Biomass thermal catalytic conversion technology can obtain high-value-added liquid fuels and chemicals, and is considered to be one of the most effective ways to use biomass as a resource. Thermal catalytic conversion is to increase the yield of one or several products through a directed thermochemical reaction of biomass under the condition of adding a catalyst. [0004] Aromatic amines (such as aniline, methyl aniline, dimethyl aniline) are an important c...

Claims

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Application Information

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IPC IPC(8): C07C209/00C07C211/46C07C211/47
CPCC07C209/00C07C211/46C07C211/47
Inventor 张颖徐禄江姚倩傅尧
Owner UNIV OF SCI & TECH OF CHINA
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