Method for preparing benzaldehyde or substituted benzaldehyde by catalytically oxidizing methylbenzene or substituted methylbenzene

A technology of catalytic oxidation and benzaldehyde, which is applied in the preparation of carbon-based compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as difficulty in realizing industrial production, and achieve the effect of simple process

Active Publication Date: 2011-05-25
SHANDONG YINGYANG FLAVORS & FRAGRANCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing benzaldehyde or substituted benzaldehyde by catalytically oxidizing methylbenzene or substituted methylbenzene
  • Method for preparing benzaldehyde or substituted benzaldehyde by catalytically oxidizing methylbenzene or substituted methylbenzene
  • Method for preparing benzaldehyde or substituted benzaldehyde by catalytically oxidizing methylbenzene or substituted methylbenzene

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Embodiment 1

[0041] Add 300 g of toluene and 5 mg of hemin into a 1-liter reactor; cover and seal the reaction system, and replace the air in the reactor with pure nitrogen for 2-3 times. The control temperature is 140°C and the pressure is about 2Mpa. The appropriate amount of air is added, and the reaction timer is started. After maintaining an appropriate temperature for 1 hour, stop the reaction. The conversion rate of toluene is 6%, the selectivity of benzaldehyde is 45%, the selectivity of benzyl alcohol is 33% and the selectivity of benzoic acid is 18%.

Embodiment 2

[0043] Add 300g of toluene and 100mg of hemin into a 1-liter reaction kettle; cover and seal the reaction system, replace the air in the kettle with pure nitrogen 2-3 times, control the temperature at 160°C, and the pressure at about 1.5Mpa. An appropriate amount of oxygen was added, and the reaction timer was started. After maintaining an appropriate temperature for 2 hours, stop the reaction. The conversion rate of toluene is 19%, the selectivity of benzaldehyde is 41%, the selectivity of benzyl alcohol is 35% and the selectivity of benzoic acid is 17%.

Embodiment 3

[0045] Add 300g of toluene and 150mg of hemin into a 1-liter reaction kettle; cover and seal the reaction system, replace the air in the kettle with pure nitrogen 2-3 times, control the temperature at 200°C, and the pressure at about 1.4Mpa. An appropriate amount of oxygen was added, and the reaction timer was started. After maintaining an appropriate temperature for 1 hour, stop the reaction. The conversion rate of toluene is 29%, the selectivity of benzaldehyde is 25%, the selectivity of benzyl alcohol is 31% and the selectivity of benzoic acid is 40%.

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Abstract

The invention provides a method for preparing benzaldehyde or substituted benzaldehyde by catalytically oxidizing methylbenzene or substituted methylbenzene and relates to the field of chemical industrial material intermediates. The benzaldehyde or substituted benzaldehyde of a general formula (1) and relevant side products are prepared by using a substance containing ferroporphyrin, derivatives of the ferroporphyrin or relevant load as a catalyst, adding a proper cocatalyst according to requirements, and oxidizing methylbenzene or substituted methylbenzene by using oxygen-containing gases such as oxygen, air and the like. In the method, the reaction is performed at a certain temperature of between 25 and 250 DEG C and pressure of 0.1 to 2 MPa; the using amount of the catalyst is small, and is 1 ppm to 1 mass percent under a non-load condition and 0.1 to 10 mass percent under a load condition; and other solvents are not added, and if necessary, a certain amount of cocatalyst is added. The method has the characteristics of environmental friendliness and simple process.

Description

technical field [0001] The invention relates to the field of chemical material intermediates, in particular to a method for preparing benzaldehyde and substituted benzaldehyde by oxidation of toluene and substituted toluene. Background technique [0002] Benzaldehyde, and benzaldehyde with substituents are important chemical raw materials and spices. Its application is almost all over the fields of fine chemicals, and the annual world demand exceeds 100,000 tons. [0003] Taking benzaldehyde as an example, it is industrially mainly oxidized by toluene with air or oxygen under the action of a catalyst (vanadium pentoxide, tungsten trioxide or molybdenum trioxide); or chlorinated toluene into benzyl chloride under light. , and then hydrolyzed and oxidized; toluene can also be chlorinated into dichloromethylbenzene first, and then hydrolyzed to obtain benzaldehyde. Industrially, benzene is also used as raw material, and it is prepared by reacting with carbon monoxide and hydro...

Claims

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Application Information

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IPC IPC(8): C07B41/06C07C45/36C07C47/54C07C201/12C07C205/44C07C47/575
Inventor 唐鹤生张宾山郑会明张连海
Owner SHANDONG YINGYANG FLAVORS & FRAGRANCES
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