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Production method of ortho-chlorotoluene

A production method, the technology of o-chlorotoluene, applied in the production field of o-chlorotoluene, can solve the problem of high content of o-chlorotoluene, and achieve the effect of simple method and easy operation

Inactive Publication Date: 2012-07-25
江苏优普生物化学科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing production method of o-chlorotoluene, due to reasons such as the catalyst used in the reaction, the content ratio of p-chlorotoluene and o-chlorotoluene in the product cannot meet the demand for high o-chlorotoluene content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A kind of production method of p-chlorotoluene, comprises the following steps:

[0013] (1) Chlorination of toluene: Put toluene in a chlorination kettle and add a catalyst, and pass chlorine gas at 50-65°C (for example, 50°C, 55°C, 65°C) for chlorination reaction for 18-20 hours, toluene and The molar ratio of chlorine gas is 1:1.2. The catalyst used in the reaction is mixed with the following components by weight percentage, then mixed with silica sol, and then treated at 80~120°C (for example, 80°C, 100°C, 120°C) for 4~6 hours be made of:

[0014] Alumina 30%

[0015] Antimony trichloride 70%; the amount of silica sol is 9% of the total weight of alumina and antimony trichloride.

[0016] Catalyst consumption is 2% of toluene weight.

[0017] After the reaction is finished, the chlorinated solution is filtered to remove the catalyst through a plate and frame filter press to obtain a crude mixed chlorotoluene liquid;

[0018] (2) Removal of toluene: the crude mixe...

Embodiment 2

[0023] The catalyst used in the reaction is prepared by mixing the following components by weight percentage, then mixing it with silica sol, and then treating it at 80~120°C (for example, 80°C, 100°C, 120°C) for 4~6 hours:

[0024] Alumina 40%

[0025] Antimony trichloride 60%; the amount of silica sol is 12% of the total weight of alumina and antimony trichloride.

[0026] Catalyst consumption is 3% of toluene weight.

[0027] All the other are with embodiment 1. In the total amount of p-chlorotoluene and o-chlorotoluene in the final product, o-chlorotoluene reaches more than 44%, and the content of o-chlorotoluene product reaches more than 99.5% after rectification.

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PUM

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Abstract

The invention discloses a production method of ortho-chlorotoluene. The production method comprises toluene chlorinating, toluene removing and chorine mixed toluene rectifying steps. The method comprises the following steps of: during toluene chlorinating, putting toluene into a chlorinating kettle, and adding a catalyst; introducing chorine gas at the temperature of 40-60 DEG C for undergoing a chlorinating reaction; mixing the catalyst used in the reaction by using aluminum oxide and trichloride antimony; mixing with silica sol; and treating at the temperature of 80-120 DEG C for 4-6 hours. The method is simple and convenient, and is easy to operate; and in the total amount of parachlorotoluene and ortho-chlorotoluene in a final product, the ortho-chlorotoluene is over 44 percent. After rectification, the content of the product is over 99.5 percent.

Description

technical field [0001] The present invention relates to a kind of production method of o-chlorotoluene. Background technique [0002] In the existing production method of o-chlorotoluene, due to reasons such as the catalyst used in the reaction, the content ratio of p-chlorotoluene and o-chlorotoluene in the product cannot meet the demand for high o-chlorotoluene content. Contents of the invention [0003] The object of the present invention is to provide a kind of production method of the high ortho-chlorotoluene content of ortho-chlorotoluene in the product. [0004] Technical solution of the present invention is: [0005] A production method of o-chlorotoluene, comprising the steps of chlorination of toluene, removal of toluene, and rectification of mixed chlorotoluene, is characterized in that: when toluene is chlorinated, toluene is put into a chlorination kettle and a catalyst is added, and at 40-60 Chlorine gas is introduced at ℃ to carry out chlorination reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C25/06C07C17/12B01J23/18
Inventor 陶坤山于海军杨建明谢兵
Owner 江苏优普生物化学科技股份有限公司
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