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Method for preparing 2, 6-dichlorobenzonitrile

A technology of dichlorobenzonitrile and dichlorotoluene, which is applied in the production field of chemically synthesizing 2,6-dichlorobenzonitrile, can solve the problems of not being able to meet market demand, difficult production control, high cost, etc., and reduce the generation of solid waste , Low production cost, less raw material consumption

Active Publication Date: 2015-04-08
永椿化工新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing 2,6-dichlorobenzonitrile synthesis methods include toluene direct chlorination method, p-nitrotoluene method, o-nitrotoluene method, p-tert-butyltoluene method, o-toluenesulfonyl chloride chlorination decomposition method, etc., but the above The defects in the production of various 2,6-dichlorobenzonitriles are: difficult production control, low output, high cost, and cannot meet the market demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Production steps:

[0021] 1. First add 750kg of 2,6-dichlorotoluene and 3-15kg of phosphorus pentachloride into the reactor, then turn on the light source (luminous flux of 50000-500000lm, color temperature of 1000-6000k), and pass high-temperature steam into the jacket , so that the temperature in the reactor reaches 80-120°C, and at the same time, chlorine gas is introduced at a ventilation rate of 25-40kg / h. Chlorine gas is passed through at a ventilation rate of 80 kg / h, and after 0.5 to 2 hours, chlorine gas is passed through at a ventilation rate of 40 to 50 kg / h, and the reaction is kept warm until the reaction is completed.

[0022] Shut off the chlorine gas, absorb the generated hydrogen chloride gas, and absorb it with water to generate hydrochloric acid, which can be sold as a by-product.

[0023] By passing low-temperature water into the jacket, the pressure in the reaction kettle is controlled to reduce to a slight negative pressure and 50-70°C, and then ...

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PUM

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Abstract

The invention discloses a method for preparing 2, 6-dichlorobenzonitrile, and relates to the technical field of production of chemically synthesized 2, 6-dichlorobenzonitrile. According to the method, 2, 6-dichlorotoluene is used as a starting material and chlorinated to prepare 2, 6-benzylidene chloride, the 2, 6-benzylidene chloride is hydrolyzed and quaternized to prepare a 2, 6-dichlorobenzonitrile crude product, and the 2, 6-dichlorobenzonitrile crude product is refined to obtain a 2, 6-dichlorobenzonitrile fine product. Production is easily controlled, raw material consumption is less, production cost is low, solid waste is decreased, emission of nitrogenous nitroso-group waste gas is reduced, and the method is an energy-saving, emission-reduction and environment-friendly industrial practical cleaning production technique.

Description

technical field [0001] The invention relates to the production technical field of chemically synthesizing 2,6-dichlorobenzonitrile. Background technique [0002] 2,6-Dichlorobenzonitrile is a synthetic intermediate of benzoylurea, a broad-spectrum new pesticide with high efficiency and low toxicity. The pesticide formed has the characteristics of high efficiency, low toxicity, no residue, and no harm to crops. It can be used to produce pesticides , herbicides, and can also be used in the production of dyes, medicines, pesticides and special polymer materials. [0003] Existing 2,6-dichlorobenzonitrile synthesis methods include toluene direct chlorination method, p-nitrotoluene method, o-nitrotoluene method, p-tert-butyltoluene method, o-toluenesulfonyl chloride chlorination decomposition method, etc., but the above The defects in the production of various 2,6-dichlorobenzonitriles are: difficult production control, low output, high cost, and cannot meet the market demand. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C255/50C07C253/02
Inventor 陈国云王瑛王晨潘明生刘润兴
Owner 永椿化工新材料有限公司
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