Preparation method of bromobenzene

A technology of bromobenzene and dibromobenzene, which is applied in the field of preparation of bromobenzene, can solve problems such as increased reaction cost, unsuitability for industrial production, and complex processing, and achieves the effects of low environmental pollution, low price, and simple synthesis steps

Pending Publication Date: 2021-01-08
潍坊摩根化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] As a basic chemical raw material, bromobenzene is widely used. It is obtained by the reaction of benzene and bromine. During the production process, a large amount of

Method used

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  • Preparation method of bromobenzene
  • Preparation method of bromobenzene

Examples

Experimental program
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Example Embodiment

[0019]Example 1

[0020]A preparation method of bromobenzene, the preparation steps are as follows: (1) Add benzene to the reaction vessel, add catalyst A to the reaction vessel under stirring, then add bromine dropwise, and reflux at elevated temperature; (2) Add benzene to the reaction vessel Add catalyst B and benzene, and reflux until the total content of dibromobenzene in the reaction solution is less than 3%, and the total content of tribromobenzene is less than 0.3%; (3) The reaction solution is washed with water and alkali, and then placed in a distillation kettle. Add water to the distillation kettle for distillation, first distill the unreacted benzene, and then collect the 155-157°C fraction, which is the bromobenzene.

Example Embodiment

[0021]Example 2

[0022]On the basis of Example 1, the catalyst A is a mixture of one or more of iron powder, ferric chloride, aluminum trichloride, and Lewis acid; the added amount of the catalyst A is 0.5 of the mass of bromine -3%; the catalyst B is aluminum trichloride; the added amount of the catalyst B is 3-5% of the mass of bromine.

Example Embodiment

[0023]Example 3

[0024]On the basis of Example 2, when the catalyst A and the catalyst B are the same substance, there is no need to separate the catalyst A before adding the catalyst B; if the catalyst A and the catalyst B are different substances, the reaction liquid needs to be left still After separating the catalyst A, add the catalyst B; the separated catalyst A can be recycled for step (1) after being sealed and stored.

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Abstract

The invention belongs to the technical field of chemical synthesis, and particularly relates to a bromobenzene preparation method, which comprises the following steps: (1) adding benzene into a reaction vessel, adding a catalyst A into the reaction vessel in a stirring state, dropwisely adding bromine, and carrying out heating reflux; (2) adding a catalyst B and benzene into the reaction vessel, and refluxing until the total content of dibromobenzene in the reaction solution is less than 3% and the total content of tribromobenzene is less than 0.3%; and (3) washing the reaction solution with water and alkali, putting the washed reaction solution into a distillation kettle, adding water into the distillation kettle, carrying out distillation, distilling off unreacted benzene, and collectinga fraction at 155-157 DEG C to obtain bromobenzene. According to the invention, the synthesis steps are simple, and the technological operation process is simple; raw materials needed in the reactionprocess are easy to obtain, most of the raw materials can be directly purchased and are low in price, and the requirement for equipment in the synthesis process is low; and less three wastes are generated in the reaction process, environmental pollution is small, and large-scale synthesis can be realized.

Description

technical field [0001] The application belongs to the technical field of chemical synthesis, in particular to a preparation method of bromobenzene. Background technique [0002] As a basic chemical raw material, bromobenzene is widely used. It is produced by the reaction of benzene and bromine. During the production process, a large number of by-products and waste water will be generated. The subsequent treatment is complicated, which greatly increases the reaction cost and is not suitable for industrial production. Contents of the invention [0003] In order to solve the problems of the prior art, the application provides a kind of preparation method of bromobenzene, and the application is realized by following scheme: [0004] A preparation method of bromobenzene, the preparation steps are as follows: (1) Add benzene into the reaction vessel, add catalyst A into the reaction vessel under stirring, then add bromine dropwise, heat up and reflux; (2) Add benzene to the reac...

Claims

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Application Information

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IPC IPC(8): C07C25/02C07C17/12C07C17/383
CPCC07C17/12C07C17/383
Inventor 张汝冰
Owner 潍坊摩根化工有限公司
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