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Application of catalyst in synthesis of 4, 4-diaminodiphenyl ether from 4, 4-dinitrodiphenyl ether

A technology of dinitrodiphenyl ether and diaminodiphenyl ether, which is applied in the field of catalyst preparation, can solve the problems of easy oxidation of metal nickel, poor stability and high cost, and achieves a green and efficient preparation method, good stability and high production cost. low effect

Pending Publication Date: 2022-01-07
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the existing 4,4'-dinitrodiphenyl ether hydrogenation catalysts, precious metal catalysts such as supported palladium and platinum have high hydrogenation activity, but the cost is high and easy to deposit carbon; while supported nickel catalysts, Although the yield of patent CN102941096A is better, metal nickel is easily oxidized and has poor stability

Method used

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  • Application of catalyst in synthesis of 4, 4-diaminodiphenyl ether from 4, 4-dinitrodiphenyl ether
  • Application of catalyst in synthesis of 4, 4-diaminodiphenyl ether from 4, 4-dinitrodiphenyl ether
  • Application of catalyst in synthesis of 4, 4-diaminodiphenyl ether from 4, 4-dinitrodiphenyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Weigh a certain amount of nickel nitrate hexahydrate and 4-pyridinecarboxylic acid and dissolve in a certain amount of absolute ethanol, the molar ratio of nickel to organic ligand is 1:2; the mass ratio of nickel to alcohol solution is 1:100. Heat at 25°C After stirring for 6 hours, add 1.0 mol / L sodium hydroxide aqueous solution dropwise to the mixed solution, adjust the pH of the solution to 4.0, and keep for 1 hour; add dropwise 98% triethanolamine solution, adjust the pH to 6.5, and keep for 2 hours; Add 25-28% ammonia water dropwise, adjust the pH to 8.5, and keep it for 2 hours. The resulting slurry is sealed and placed on a vibration table. The vibration program is set as follows: 1) Vibration frequency 10Hz, banner vibration for 2 minutes; 2) Vibration frequency 30Hz, banner vibration for 5 minutes; 3) Vibration frequency 40Hz, banner vibration for 1 minute; 4) The operation procedure 1)-3) is a vibration cycle; the entire crystallization, precipitation and agi...

Embodiment 16

[0118] Example 16 investigated the performance of different nickel nanoparticle catalysts prepared in Examples 1-15 and Comparative Examples 1-16 in catalytic hydrogenation synthesis of haloanilines.

[0119] In a 50ml stainless steel reaction kettle, add 25ml methanol, 1.0g p-chloronitrobenzene, 0.05g carbon material coated nickel nanoparticle catalyst prepared by different embodiments or comparative examples, close the reaction kettle, and replace the air in the reaction kettle with hydrogen for 10 The second time, the temperature was raised to 100°C, the hydrogen pressure was 1.0 MPa, stirring was started, and the stirring rate was 1800 r / min, and the reaction was carried out for 40 minutes. Stop the reaction, and after the temperature drops to room temperature, take the supernatant of the reaction solution, filter the catalyst, and analyze the filtrate by gas chromatography. The experimental results are shown in Table 3:

[0120] Table 3 Performance of different carbon ma...

Embodiment 17

[0124] Example 17 investigated the reaction performance of the carbon material-coated nickel nanoparticle catalyst prepared in Example 2 for the hydrogenation of different halogenated nitrobenzenes to prepare halogenated anilines.

[0125] In a 50ml stainless steel reactor, add 25ml of methanol, 1.0g of different halogenated nitrobenzenes, 0.05g of the carbon material coated nickel nanoparticle catalyst prepared in Example 2, close the reactor, and replace the air in the reactor with hydrogen for 10 times , the temperature was raised to 100° C., the hydrogen pressure was 1.0 MPa, stirring was started at a stirring rate of 1800 r / min, and the reaction was carried out for 1 h. Stop the reaction, and after the temperature drops to room temperature, take the supernatant of the reaction solution, filter the catalyst, and analyze the filtrate by gas chromatography. The experimental results are shown in Table 4:

[0126] Table 4 Reaction performance of nickel nanoparticle catalysts ...

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Abstract

The invention discloses an application of a carbon material coated nickel nanoparticle catalyst in hydrogenation synthesis of 4, 4 '-diaminodiphenyl ether from 4, 4'-dinitrodiphenyl ether. The carbon material coated nickel nanoparticle catalyst is applied to hydrogenation synthesis of 4, 4 '-diaminodiphenyl ether from 4, 4'-dinitrodiphenyl ether, and has the advantages of high conversion rate, high selectivity, good stability and long service life.

Description

technical field [0001] The invention belongs to the field of catalyst preparation technology and application, and relates to the application of a carbon material-coated nickel nanoparticle catalyst in the hydrogenation of 4,4'-dinitrodiphenyl ether to synthesize 4,4'-diaminodiphenyl ether. Background technique [0002] Nickel nanoparticles have great application value in catalysis, lithium batteries, sensors and other fields. As a catalyst, nanoscale nickel particles have better catalytic activity than bulk or flake, but due to the high surface energy, nanoscale nickel particles are easy to agglomerate and limit its advantages. When exposed to the air, the metal nanoparticles are easily oxidized into metal oxides, and a layer of carbon material wrapped around the metal nanoparticles can prevent the metal nanoparticles from being oxidized. In addition to the characteristics of non-toxicity, high thermal stability and low price, the carbon layer-coated metal structure also ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J37/08C07C209/36C07C211/52C07C227/04C07C229/42C07C303/22C07C309/46C07C213/02C07C217/90C07C211/61
CPCB01J23/755B01J37/086C07C209/365C07C227/04C07C303/22C07C213/02C07C209/36C07C2603/24B01J35/398C07C211/52C07C229/42C07C309/46C07C217/90C07C211/61
Inventor 卢春山杨园园李小年张群峰丰枫
Owner ZHEJIANG UNIV OF TECH
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