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Method for selectively oxidizing toluene to synthesize benzaldehyde

A technology for benzaldehyde and toluene, which is applied in the field of selective oxidation of toluene to synthesize benzaldehyde, can solve the problems of low selectivity of benzaldehyde, expensive reaction reagents, complicated catalyst preparation method, etc., and achieves good reproducibility, simple reaction equipment, and good selection. good effect

Inactive Publication Date: 2013-06-26
CHANGZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As can be seen from the published patents, in the process of preparing benzaldehyde by heterogeneous oxidation of toluene, there are still disadvantages such as the selectivity of benzaldehyde is still low, the preparation method of the catalyst is complicated and the reaction reagent is expensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Toluene oxidation reaction was carried out in a 100mL reaction vessel, 1g toluene, 20mL acetonitrile, 50mg Co were added 2 / Al-LDO catalyst, stirred, heated to 70° C., 3.9 g of TBHP dehydrated was added dropwise to the reaction system, and the reaction time was 7 h. After the reaction, the reaction system was lowered to room temperature and sampled for analysis. The product analysis was done on a Kexiao GC-1690 gas chromatograph using the internal standard method. The conversion rate of toluene was 5.2%, and the selectivity of benzaldehyde was 82.6%.

Embodiment 2

[0024] Example 2: Toluene oxidation reaction was carried out in a 100mL reaction vessel, 1g toluene, 20mL acetonitrile, 50mg Co were added 4 / Al-LDO catalyst, stirred, heated to 70° C., 3.9 g of TBHP dehydrated was added dropwise to the reaction system, and the reaction time was 7 h. After the reaction, the reaction system was lowered to room temperature and sampled for analysis. The product analysis was done on a Kexiao GC-1690 gas chromatograph using the internal standard method. The conversion rate of toluene was 7.8%, and the selectivity of benzaldehyde was 80.6%.

Embodiment 3

[0025] Example 3: Toluene oxidation reaction was carried out in a 100 mL reaction vessel, 1 g of toluene, 20 mL of acetonitrile, 50 mg of Co were added 2 / Al-LDH catalyst, stirred, heated to 70° C., 3.9 g of TBHP dehydrated was added dropwise to the reaction system, and the reaction time was 7 h. After the reaction, the reaction system was lowered to room temperature and sampled for analysis. The product analysis was done on a Kexiao GC-1690 gas chromatograph using the internal standard method. The conversion rate of toluene was 3.4%, and the selectivity of benzaldehyde was 86.8%.

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Abstract

The invention discloses a method for selectively oxidizing toluene to synthesize benzaldehyde and relates to the field of industrial catalysis of petrochemical industry. Hydrotalcite-like compound (Cox / Al-LDH) and roasted product (Cox / Al-LDO) thereof are adopted as catalysts (x=1-4); acetonitrile, dichloromethane or chloroform is taken as a solvent; and tert-butyl peroxide alcohol is taken as an oxidant, and thus high benzaldehyde selectivity can be obtained. The catalyst is simple to prepare, low in cost, good in stability, and convenient to recover, and can be repeatedly used.

Description

technical field [0001] The invention relates to the industrial catalysis field of petrochemical industry, in particular to a method for selectively oxidizing toluene to synthesize benzaldehyde under mild conditions. technical background [0002] Benzaldehyde is an important chemical raw material and an important intermediate in fine chemicals. It is mainly used in flavors and fragrances, medicine, cosmetics and food additives. [0003] The synthesis methods of benzaldehyde include toluene chlorination hydrolysis method, methyl benzoate reduction method (CN1257060) and toluene catalytic oxidation method. Compared with the toluene hydrolysis method, the benzaldehyde produced by the catalytic oxidation method has high product quality and is suitable for application in the pharmaceutical, fragrance, food and other industries. In industry, cobalt, manganese and bromine are mostly used as catalytic systems, acetic acid is used as reaction solvent, and oxygen or air is used as oxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/54C07C45/28
Inventor 周维友曹明鸣孙富安仲霞陈群何明阳
Owner CHANGZHOU UNIV
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