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Method for preparing 6-chloro-2-nitrotoluene

A technology of nitrotoluene and o-nitrotoluene, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the unseen problems of increasing the output of 6-chloro-2-nitrotoluene, etc. Achieve the effect of reducing production cost, increasing output and saving energy

Inactive Publication Date: 2011-03-16
GUANGZHOU YABANG SHENLIAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research and development of the preparation method of 6-chloro-2-nitrotoluene is mainly in the research and development of the catalyst, but there is no relevant report that can increase the production of 6-chloro-2-nitrotoluene.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A method for preparing 6-chloro-2-nitrotoluene, comprising the following steps: put o-nitrotoluene into a reaction kettle, start stirring, put in metal antimony as a catalyst, heat up, keep the temperature within the range of 35° C. Gas chromatography carries out central control detection, when the o-nitrotoluene content is 10.5%, the reaction ends, cooling, discharging, and can enter the rectification section, metal antimony, as a catalyst, the amount is 0.05% of the o-nitrotoluene mass; The amount of chlorine gas introduced is 0.5% of the mass of o-nitrotoluene.

[0011] After testing, the test results are: 64.5% of 6-chloro-2-nitrotoluene, 24% of 4-chloro-2-nitrotoluene, 10.5% of o-nitrotoluene, and 1% of dichloronitrotoluene.

Embodiment 2

[0013] A method for preparing 6-chloro-2-nitrotoluene, comprising the following steps: put o-nitrotoluene into a reaction kettle, start stirring, put in metal tin as a catalyst, heat up, keep the temperature within the range of 55° C. Gas chromatography is used for central control detection. When the content of o-nitrotoluene is 10%, the reaction is completed, cooled and discharged, and then it can enter the rectification section. The amount of metal tin used as a catalyst is 0.1% of the mass of o-nitrotoluene; The feed rate is 0.7% of the mass of o-nitrotoluene.

[0014] After testing, the test results: 6-chloro-2-nitrotoluene 65.5%, 4-chloro-2-nitrotoluene 23%, o-nitrotoluene 10%, dichloronitrotoluene 1.5%.

Embodiment 3

[0016] A method for preparing 6-chloro-2-nitrotoluene, comprising the following steps: put o-nitrotoluene into a reaction kettle, start stirring, put in antimony halide as a catalyst, heat up, keep the temperature within the range of 40° C. Gas chromatography is used for central control detection. When the content of o-nitrotoluene is 12%, the reaction is completed, cooled and discharged, and then it can enter the rectification section. The amount of antimony halide as a catalyst is 0.1% of the mass of o-nitrotoluene; The feed rate is 3% of the mass of o-nitrotoluene.

[0017] After testing, the test results: 6-chloro-2-nitrotoluene 65%, 4-chloro-2-nitrotoluene 23.5%, o-nitrotoluene 10%, dichloronitrotoluene 1.5%.

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PUM

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Abstract

The invention discloses a method for preparing 6-chloro-2-nitrotoluene. The method comprises the following steps of: throwing o-nitrotoluene into a reaction kettle; starting and stirring; adding a catalyst; heating; introducing chlorine gas at the temperature of between 25 and 85 DEG C, wherein tests show that the reaction is ended when the o-nitrotoluene content is 8 to 12 percent; cooling; discharging; and then performing rectification. In the preparation method, by properly selecting the catalyst on the basis of not changing the conventional mature technology, the proportion of the 6-chloro-2-nitrotoluene to 4-chloro-2-nitrotoluene serving as two isomers can be effectively improved, so that the 6-chloro-2-nitrotoluene content is about 65 percent, the production cost is reduced, the energy is saved and the method is suitable for industrial production.

Description

technical field [0001] The present invention relates to an intermediate compound, in particular to a method for preparing 6-chloro-2-nitrotoluene. Background technique [0002] 6-Chloro-2-nitrotoluene is an important intermediate of medicine, pesticide and dyestuff. to obtain 6-chloro-2-nitrotoluene, 4-chloro-2-nitrotoluene, dichloronitrotoluene and unreacted o-nitrotoluene, and the obtained above-mentioned products can be obtained through rectification The desired 6-chloro-2-nitrotoluene. From the perspective of the existing technical process, the content of the main product 6-chloro-2-nitrotoluene prepared by the catalyst of the prior art is 55%, and the content of 4-chloro-2-nitrotoluene is 35%. The content of dichloronitrotoluene is 1%, and the content of o-nitrotoluene is 9%, as known from above-mentioned data, the content of the 6-chloro-2-nitrotoluene that the catalyzer that prior art adopts obtains is lower, like this Invisibly increased production costs. At pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C205/12C07C201/12B01J23/18B01J23/14B01J27/08
Inventor 李华顾益华
Owner GUANGZHOU YABANG SHENLIAN CHEM
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