Industrialized method for producing 2, 6-dichloro phenyl nitrile

A technology of dichlorobenzonitrile and a production method, which is applied in the directions of botanical equipment and methods, chemicals used for biological control, biocides, etc., can solve the complex process affecting use, dosage promotion, and treatment, and the production process is not easy to control. And other issues

Inactive Publication Date: 2006-05-24
YANGZHOU TIANCHEN FINE CHEM
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Problems solved by technology

However, at present, 2.6-dichlorobenzonitrile, which is in large demand in China, is mostly dependent on imports, which makes the production costs of insecticides, herbicides, dyes, medicines, and special polymer materials formed by further processing of this product high, which also greatly affects Further promotion of its use and dosage
There is also a production method that adopts the ammonia oxidation method. Because its production process is difficult to control, the three wastes produced are in order to meet environmental protection requirements, and the equipment and treatment process are complicated. These also lead to the cost of producing 2.6-dichlorobenzonitrile

Method used

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Embodiment Construction

[0015] 1. Chlorination section: Add raw material 6-chloro-o-nitrotoluene, catalyst phosphorus pentachloride + pyridine into the chlorination kettle, heat up and control the temperature within the range of 100-220°C. After the target temperature is reached, chlorine gas is introduced. The chlorination temperature is controlled within 220°C, the chlorine flow rate is controlled between 10-80kg / hr, and the chlorination time is controlled within 24 hours. Chlorine reflux makes the content of the chlorinated solution reach the process index, that is, 60% of 2.6-dichlorobenzyl and 30% of 2.6-dichlorobenzonitrile are produced, and qualified raw materials are provided to the nitrile chemical section. The tail gas is absorbed by dilute acid to absorb HQ gas, and after neutralizing the excess chlorine gas, it is discharged up to the standard.

[0016] Feeding ratio: 500 kg of 6-chloronitrotoluene

[0017] Phosphorus pentachloride 3-15 kg

[0018] Pyridine 5-25 kg ...

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Abstract

The invention relates to a method for industrialized producing 2.6-dichlorobenzonitrile, adopting 6-chloro-o-nitrotoluene chloro-o-nitrotoluene as raw material to make chlorination reaction under the action of catalyst, then making cyanogenation reaction with formic acid and hydroxylammonium chloride, and refining again and again to obtain 2.6-dichlorobenzonitrile whose content is 99.8% above. The produced 2.6- dichlorobenzonitrile is a white powdery crystal, purity 99.8%-9995%, melting point 141.0 deg.C -144.0 deg.C, water ratio <=01%, and product yield up to 64%.

Description

technical field [0001] The invention relates to a production process of 2.6-dichlorobenzonitrile. Background technique [0002] 2.6-Dichlorobenzonitrile is a raw material mainly used for the production of new insecticides and herbicides with high efficiency, low toxicity, no residue, insecticide and no harm to crops. The insecticide produced with 2.6-dichlorobenzonitrile can inhibit the synthesis of chitin in insects. The insecticidal mechanism is unique, the dosage is small, and the concentration of PPM is effective, and it is safe for humans and animals and friendly to the environment. 2.6-Dichlorobenzonitrile is also used in the fields of dyes, medicines, and special polymer materials. Polyarylene ether nitrile films produced with 2.6-dichlorobenzonitrile are the main components of high-energy storage, high-power, and light supercapacitors. Raw materials play a very important role in the development of aviation, aerospace and national defense modernization. However, at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C255/50A01N37/34A01P13/00C07C253/02
Inventor 陈国云潘明生刘润兴
Owner YANGZHOU TIANCHEN FINE CHEM
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