Method for oxidizing ethylbenzene at low temperature

Abstract

The invention relates to a method for oxidizing ethylbenzene at a low temperature. The method is used for oxidizing ethylbenzene at a relatively low temperature (30-80 DEG C) by taking an HBeta molecular sieve as a catalyst, hydrogen peroxide as an oxidizing agent and water as a reaction solvent. A reaction product comprises benzophenone. The system is a mild oxidizing reaction system and has a good application prospect in industrial production.

Description

technical field

[0001] The invention belongs to the field of catalytic reaction and relates to a method for oxidizing ethylbenzene at low temperature. Background technique

[0002] Acetophenone is an important chemical raw material, which is widely used in many fields such as pharmacy and food processing. Traditionally, acetophenone is prepared through the reaction of benzene and acetyl chloride, but this method has problems such as polluting the environment and corroding equipment. In comparison, the preparation of acetophenone through the direct oxidation of ethylbenzene has many advantages, for example: a heterogeneous catalyst can catalyze the oxidation of ethylbenzene to produce acetophenone, and the catalyst used is easy to recycle and can be reused. The direct oxidation of ethylbenzene to prepare acetophenone is a green method with potential application value and important application prospect. Contents of the invention

[0003] The technical scheme provided for r...

Examples

Embodiment 1

[0007] The reaction was carried out in a flask. Take 1.25g of HBeta molecular sieves and 8.0ml of toluene, add them to 30.0ml of water, raise the temperature to 45°C, add 20.0ml of hydrogen peroxide dropwise, and react for 10h; the reaction product was extracted with ethyl acetate. The conversion of ethylbenzene was 5.9%, and the selectivity of benzophenone was 27.3%.

Embodiment 2

[0009] The reaction was carried out in a flask. Take 2.75g of HBeta molecular sieves and 10.0ml of toluene, add them to 40.0ml of water, raise the temperature to 65°C, add 30.0ml of hydrogen peroxide dropwise, and react for 12h; the reaction product was extracted with ethyl acetate. The conversion rate of ethylbenzene was 7.6%, and the selectivity of benzophenone was 21.9%.

technical field

[0001] The invention belongs to the field of catalytic reaction and relates to a method for oxidizing ethylbenzene at low temperature. Background technique

[0002] Acetophenone is an important chemical raw material, which is widely used in many fields such as pharmacy and food processing. Traditionally, acetophenone is prepared through the reaction of benzene and acetyl chloride, but this method has problems such as polluting the environment and corroding equipment. In comparison, the preparation of acetophenone through the direct oxidation of ethylbenzene has many advantages, for example: a heterogeneous catalyst can catalyze the oxidation of ethylbenzene to produce acetophenone, and the catalyst used is easy to recycle and can be reused. The direct oxidation of ethylbenzene to prepare acetophenone is a green method with potential application value and important application prospect. Contents of the invention

[0003] The technical scheme provided for r...

Examples

Embodiment 1

[0007] The reaction was carried out in a flask. Take 1.25g of HBeta molecular sieves and 8.0ml of toluene, add them to 30.0ml of water, raise the temperature to 45°C, add 20.0ml of hydrogen peroxide dropwise, and react for 10h; the reaction product was extracted with ethyl acetate. The conversion of ethylbenzene was 5.9%, and the selectivity of benzophenone was 27.3%.

Embodiment 2

[0009] The reaction was carried out in a flask. Take 2.75g of HBeta molecular sieves and 10.0ml of toluene, add them to 40.0ml of water, raise the temperature to 65°C, add 30.0ml of hydrogen peroxide dropwise, and react for 12h; the reaction product was extracted with ethyl acetate. The conversion rate of ethylbenzene was 7.6%, and the selectivity of benzophenone was 21.9%.