A kind of method that the catalytic oxidation of chlorotoluene prepares chlorobenzaldehyde

A technology of chlorobenzaldehyde and chlorotoluene, which is applied in the field of preparation of chlorobenzaldehyde, can solve problems such as difficulty in controlling the degree of chlorination, serious environmental pollution, complicated process, etc., and achieves easy control, good selectivity, and simple process Effect

Active Publication Date: 2022-04-15
CHINA SALT CHANGZHOU CHEM
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Problems solved by technology

The traditional industrial production of chlorobenzaldehyde is mainly through the chlorination hydrolysis of chlorinated toluene. This method has the disadvantages of complex process, difficult control of chlorination degree, high production cost, and serious environmental pollution.

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  • A kind of method that the catalytic oxidation of chlorotoluene prepares chlorobenzaldehyde

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Embodiment Construction

[0020] In order to make the technical objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are Some, but not all, embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] A method for preparing chlorobenzaldehyde by catalytic oxidation of chlorotoluene, using chlorotoluene as a raw material, and preparing chlorobenzaldehyde by catalytic oxidation under the action of a loaded metal oxide catalyst, an oxidant, a cocatalyst, and a solvent; further, the When the supported metal oxide catalyst is represented by M / Al-MCM-41, wh...

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Abstract

The invention discloses a method for preparing chlorobenzaldehyde by catalytic oxidation of chlorotoluene. The method adopts a high-pressure reactor as a reactor, and uses M / Al-MCM-41 (M=Co, Mn) supported metal oxide as a A catalyst, wherein Al-MCM-41 molecular sieve is used as a carrier, Co and Mn are used as active components, oxygen is used as an oxidant, KBr is used as a co-catalyst, and acetic acid is used as a solvent. The optimal reaction conditions are: reaction temperature 120°C, reaction time 10h, catalyst dosage 2.5%, active component loading 13%, Co / Mn=1 / 2, co-catalyst dosage 0.5%, and the reaction pressure controlled by oxygen flow does not exceed 0.2MPa, the solvent dosage is 30%, the conversion rate of o-chlorotoluene is up to 90%, and the selectivity of chlorobenzaldehyde is up to 92%. The catalyst of the invention has the advantages of good stability, low catalyst cost, environmental friendliness, simple reaction process and the like, and has good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of chlorobenzaldehyde preparation, and in particular relates to a method for preparing chlorobenzaldehyde by catalytic oxidation of chlorotoluene. Background technique [0002] O-chlorobenzaldehyde has a density of 1.243g / cm3 and a boiling point of 211.9°C (normal pressure), and p-chlorobenzaldehyde has a density of 1.196g / cm3 and a boiling point of 214°C. They are important intermediates for synthetic dyes, pesticides and medicines body. [0003] At present, chlorobenzaldehyde can be synthesized by the following methods, including chlorination hydrolysis, electrochemical oxidation, hydrogen peroxide oxidation, air or oxygen direct oxidation, etc. The traditional industrial production of chlorobenzaldehyde is mainly through the chlorination and hydrolysis of chlorinated toluene, which has the disadvantages of complex process, difficulty in controlling the degree of chlorination, high production cost, and se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/36C07C47/55B01J29/035B01J27/08
CPCC07C45/36B01J29/0358B01J27/08B01J35/0006C07C47/55
Inventor 张驰吴发明王顺利孙运林马凯刘向超朱成明董亮陶文平姚迪
Owner CHINA SALT CHANGZHOU CHEM
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