Production method of p-chlorotoluene

A production method and technology of p-chlorotoluene are applied in the production field of p-chlorotoluene and can solve the problem of high content of chlorotoluene

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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the existing production method of p-chlorotoluene, due to reasons such as the catalyst used in the reaction, the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A kind of production method of p-chlorotoluene, comprises the following steps:

[0014] (1) Chlorination of toluene: Put toluene in a chlorination kettle and add a catalyst, and pass chlorine gas at 40-60°C (for example, 40°C, 50°C, 60°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 composed of the following components by weight percentage after being reacted at 120-150°C (for example, 120°C, 130°C, 150°C) for 6-8 hours, and then activated in an 800°C high-temperature activation furnace. ~6 hours to make:

[0015] Alumina 25%

[0016] Silica 65%

[0017] Sodium Oxide 10%.

[0018] Catalyst consumption is 2% of toluene weight.

[0019] 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;

[0020] (2) Removal of toluene: the crude mixed chlorotoluene liquid ...

Embodiment 2

[0025] The catalyst used in the reaction is prepared by reacting the following components by weight percentage at 120-150°C (for example, 120°C, 130°C, 150°C) for 6-8 hours, and then entering the 800°C high-temperature activation furnace for 4-6 hours of activation:

[0026] Alumina 20%

[0027] Silicon oxide 75%

[0028] Sodium Oxide 5%.

[0029] Catalyst consumption is 3% of toluene weight.

[0030] All the other are with embodiment 1. In the total amount of p-chlorotoluene and o-chlorotoluene in the final product, p-chlorotoluene reaches more than 80%. The content of the product after rectification reaches more than 99.5%.

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Abstract

The invention discloses a production method of p-chlorotoluene, comprising the steps of chloridizing toluene, removing toluene and rectifying mixed chlorotoluene. Toluene is chloridized by the steps of placing toluene in a chlorination kettle and adding a catalyst in the chlorination kettle, and feeding chlorine at 40-60 DEG C and carrying out a chlorination reaction. The catalyst used in the chlorination reaction is prepared by the steps of reacting alumina, silicon oxide and sodium oxide react at 120-150 DEG C for 6-8 hours and activating in a high-temperature activation furnace at 800 DEG C for 4-6 hours. The production method provided by the invention is simple and convenient and is easy to operate. In the total content of p-chlorotoluene and o-chlorotoluene in final products, the content of p-chlorotoluene is up to above 80%. After rectification, the content of p-chlorotoluene is up to above 99.5%.

Description

technical field [0001] The present invention relates to a kind of production method of p-chlorotoluene. Background technique [0002] In the existing production method of p-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 a high content of p-chlorotoluene. Contents of the invention [0003] The object of the present invention is to provide a kind of production method of the p-chlorotoluene that content of p-chlorotoluene is high in a kind of product. [0004] Technical solution of the present invention is: [0005] A kind of production method of p-chlorotoluene, comprises the steps of toluene chlorination, toluene removal, mixed chlorotoluene rectification, it is characterized in that: when toluene is chlorinated, toluene is put into chlorination still and adds catalyst, at 40~60 Chlorine gas is introduced at ℃ to carry out the chlorination reaction....

Claims

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Application Information

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IPC IPC(8): C07C25/02C07C17/12B01J23/04
Inventor 陶坤山于海军杨建明张泽
Owner 江苏优普生物化学科技股份有限公司
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