Device for preparing benzaldehyde through toluene oxidation

Abstract

The invention discloses a device for preparing benzaldehyde by oxidizing toluene, comprising: a high-pressure reaction kettle, a stirrer, an oxygen cylinder, an air cylinder, a sampler, and a temperature control device; A sampling tube is provided in the direction of the sampling tube, and a third valve is arranged on the sampling tube, and the sampler is arranged below the sampling tube; the device principle of the present invention is simple, and is suitable for use in a laboratory. The present invention adopts a high-pressure reactor As a reactor for toluene oxidation, the pressure in the reaction kettle is controlled through the interaction between the air cylinder and the oxygen cylinder. At the same time, the present invention uses the pressure difference between the inside and outside to automatically sample. After the sampling is completed, the second valve is opened to return the sample in the pipeline to the reactor. The reaction kettle and a small amount enter the sampler, and there is no sample residue in the pipeline, which ensures the accuracy of the next sampling. The device of the present invention can simply sample, facilitate multiple sampling, and significantly improve the experimental efficiency.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a device for preparing benzaldehyde by oxidizing toluene. Background technique [0002] As an important raw material for organic synthesis, benzaldehyde is widely used in industries such as cosmetics, medicine, pesticides, spices and dyes. At present, there are three main industrial methods for preparing benzaldehyde: toluene chlorination and hydrolysis, toluene direct oxidation, and benzyl alcohol oxidation. Among them, the direct oxidation of toluene to generate benzaldehyde under gas phase or liquid phase conditions is a relatively economical and environmentally friendly method; the cost of the current preparation of benzaldehyde by oxidation of toluene is too high, the operation is complicated, and the laboratory device is generally used multiple times during the experiment. Sampling is carried out for analysis and research. At present, there is no device suitable...

AI Technical Summary

Problems solved by technology

Among them, the direct oxidation of toluene to generate benzaldehyde under gas phase or liquid phase conditions is a relatively economical and environmentally friendly method; the cost of the current preparation of benzaldehyde by oxidation of toluene is too high, the operation is complicated, and the laboratory device is generally used multiple times during the experiment. Sampling for analysis and research. At present, there is no device suitable for laboratory research and development to prepare benzaldehyde by oxidation of toluene

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