Device for preparing benzaldehyde through toluene oxidation

A technology of benzaldehyde and toluene, which is applied in the field of devices for preparing benzaldehyde by oxidation of toluene, can solve the problems of complicated operation and high cost, and achieve the effect of simple device principle, simple sampling, and guaranteed accuracy

Inactive Publication Date: 2017-06-27
QINZHOU UNIV
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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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  • Device for preparing benzaldehyde through toluene oxidation

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0017] Such as figure 1 As shown, a device for preparing benzaldehyde by oxidation of toluene includes: autoclave 1, stirrer 2, oxygen bottle 3, air bottle 4, sampler 6, temperature control device 5;

[0018] Wherein one end of the agitator 2 is arranged in the autoclave 1 for stirring the reactants, the autoclave 1 is connected with the oxygen bottle 3 and the air bottle 4 successively through pipelines, and is provided with a first valve 31, a second Two valves 41, the first valve 31 is connected in parallel with the second valve 41, the first valve 31 controls the oxygen cylinder 3, the second valve 41 controls the air cylinder 4, and the oxygen in the oxygen cylinder 3 is opened to open the first valve 31. Into the autoclave 1, wherein one end of the pipeline goes deep i...

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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...

Claims

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Application Information

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IPC IPC(8): C07C45/36C07C47/54
CPCC07C45/36
Inventor 王伟建韦小云石海信刘子杰晁会霞罗祥生何坤欢张海燕
Owner QINZHOU UNIV
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