Method for preparing 2,6-dichlorotoluene from o-chlorotoluene

A technology of o-chlorotoluene and dichlorotoluene, which is applied in the field of preparing 2,6-dichlorotoluene by chlorination of o-chlorotoluene, can solve the problems of harsh reaction conditions, high production cost, complicated process, etc., and achieves mild reaction conditions and production The effect of low cost and simple process

Inactive Publication Date: 2016-04-13
NANJING ZHONGTENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the prior art has the following deficiencies in the method for preparing 2,6-dichlorotoluene: 1. the process is complex and industrialization is difficult; 2. the reaction conditions are harsh and the operation safety is poor; 3. the reaction conversion rate and yield are low ; ④ The product quality is not high, and the production cost is high; ⑤ The amount of three wastes is large, and post-processing is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for preparing 2,6-dichlorotoluene with o-chlorotoluene may further comprise the steps:

[0022] (a) Add chlorination catalyst: add o-chlorotoluene material into the reaction kettle, and then add chlorination catalyst. The mass of the chlorination catalyst is 0.5% of the mass of o-chlorotoluene. Turn on the stirring to make the catalyst evenly distributed in the material, and turn on the tail gas Absorb the circulating water pump to absorb the tail gas generated after the reaction;

[0023] The preparation method of described chlorination catalyst is as follows: add 100kg xylene and 10kg macroporous silica gel in reactor, stir macroporous silica gel and xylene to mix evenly, add 2kg aluminum trichloride, 1.5kg iron powder and 1.2kg vulcanization Ferrous and stirred evenly, heated to 60°C, stirred for 30 minutes, cooled to normal temperature, filtered, and the filtered solid was dried in a drying oven to obtain a chlorination catalyst;

[0024] (b) Chlorinatio...

Embodiment 2

[0028] The method for preparing 2,6-dichlorotoluene with o-chlorotoluene may further comprise the steps:

[0029] (a) Add chlorination catalyst: add o-chlorotoluene material into the reaction kettle, then add chlorination catalyst, the mass of chlorination catalyst is 2.0% of the mass of o-chlorotoluene, start stirring to make the catalyst evenly distributed in the material, turn on the tail gas Absorb the circulating water pump to absorb the tail gas generated after the reaction;

[0030] The preparation method of described chlorination catalyst is as follows: add 100kg xylene and 10kg macroporous silica gel in reaction kettle, stir macroporous silica gel and xylene to mix evenly, add 1.5kg aluminum trichloride, 2kg iron powder and 1.5kg vulcanization Ferrous and stirred evenly, heated to 80°C, stirred for 20 minutes, cooled to normal temperature, filtered, and the filtered solid was dried in a drying oven to obtain a chlorination catalyst;

[0031] (b) Chlorination of o-chl...

Embodiment 3

[0035]The method for preparing 2,6-dichlorotoluene with o-chlorotoluene may further comprise the steps:

[0036] (a) Add chlorination catalyst: add o-chlorotoluene material into the reaction kettle, and then add chlorination catalyst. The mass of the chlorination catalyst is 1.0% of the mass of o-chlorotoluene. Turn on the stirring to make the catalyst evenly distributed in the material, and turn on the tail gas Absorb the circulating water pump to absorb the tail gas generated after the reaction;

[0037] The preparation method of described chlorination catalyst is as follows: add 100kg xylene and 10kg macroporous silica gel in reactor, stir macroporous silica gel and xylene to mix evenly, add 1.5kg aluminum chloride, 1.0kg iron powder and 0.8kg Stir ferrous sulfide evenly, heat to 70°C, stir for 25 minutes, cool to normal temperature, filter, and dry the filtered solid in a drying oven to obtain a chlorination catalyst;

[0038] (b) Chlorination of o-chlorotoluene: open the...

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Abstract

The present invention provides a method for preparing 2,6-dichlorotoluene from o-chlorotoluene, the method comprises the following steps: (a) addition of a chlorination catalyst, (b) chlorination of the o-chlorotoluene, and (c) component separation, the o-chlorotoluene is reacted with the chloride under the effect of the chlorination catalyst, adverse factors of high cost and heavy pollution of a traditional process for production of the 2,6-dichlorotoluene by a diazotization method can be eliminated, and the method for preparing the 2,6-dichlorotoluene from the o-chlorotoluene is simple in process, mild in reaction conditions and low in production cost, and has the characteristics of being free of high-temperature operation, high in efficiency, economic, energy-saving and environmentally-friendly. Difference components can be obtained by rectification and recrystallization of a reaction product in accordance with the different boiling and melting points of the components.

Description

technical field [0001] The invention relates to the technical field of preparation of 2,6-dichlorotoluene, in particular to a method for preparing 2,6-dichlorotoluene by chlorination of o-chlorotoluene. Background technique [0002] 2,6-Dichlorotoluene is an important fine chemical raw material for the manufacture of fungicides, insecticides, herbicides, dyes and pigments, pharmaceuticals and other chemical products. 2,6-dichlorotoluene can produce 2,6-dichlorobenzaldehyde, which can be further processed to produce pharmaceutical intermediate 2,6-dichlorobenzaldehyde oxime, dicloxacillin for medicine and wool fabric dyeing Dye acid medium bleaching blue B; 2,6-dichlorotoluene can be used to produce herbicide 2,6-dichlorobenzonitrile through ammonia oxidation, which can be further processed into pesticide herbicide Cao Kele, fluorine-containing acyl urea insecticides, etc. , 2,6-dichlorotoluene can also produce 2,4-dichloro-3-methylphenol, 2,4-dichloro-3-methylacetophenone, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/12C07C25/02B01J27/128
CPCC07C17/12B01J27/128
Inventor 钟华陆敏山陈秀珍蔡伟忠
Owner NANJING ZHONGTENG CHEM
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