Industrialized method for producing 2, 6-dichloro phenyl nitrile

A technology of dichlorobenzonitrile and its production method, which is applied in the fields of botany equipment and methods, chemicals for biological control, biocides, etc., and can solve complex processing techniques, high production costs, impact on usage, promotion of dosage, etc. question

Inactive Publication Date: 2007-03-14
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 using the ammonia oxidation method. Because the production process is not easy to control, in order to meet the requirements of environmental protection, the three wastes produced need to be re-invested in equipment and the treatment process is complicated. These also lead to the high cost of producing 2.6-dichlorobenzonitrile

Method used

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Embodiment Construction

[0014] 1. Chlorination section: Add raw material 6-chloro-o-nitrotoluene, catalyst phosphorus pentachloride and pyridine to the chlorination kettle, heat it up, and control the temperature in the range of 100-220℃. After reaching the target temperature, let in chlorine gas. The chlorination reaction temperature is controlled within 220°C, the chlorine flow rate is controlled between 10 and 80 kg / hr, and the chlorination time is controlled within 24 hours. Chlorine refluxing makes the content of the chlorinated solution reach the process index, that is, 60% of 2.6-dichlorodichlorobenzyl and 30% of 2.6-dichlorobenzonitrile are generated, and qualified raw materials are provided to the nitrile chemical section. The tail gas is absorbed by dilute acid, and then after the excess chlorine is neutralized, it will be discharged up to the standard.

[0015] Feeding ratio: 6-chloro-o-nitrotoluene 500 kg

[0016] Phosphorus pentachloride 3~15 kg

[0017] Pyridine 5~25kg

[...

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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 kind of raw material mainly used to produce new pesticides and herbicides with high efficiency, low toxicity, no residue, insecticide clean and no harm to crops. The insecticide produced with 2.6-dichlorobenzonitrile can inhibit the synthesis of insect chitin. It has a unique insecticidal mechanism, a small dosage, and a concentration of PPM that is effective. It is safe for humans and animals and is environmentally friendly. 2.6-Dichlorobenzonitrile is also used in the fields of dyes, medicine, special polymer materials, etc. The polyarylene ether nitrile film produced with 2.6-Dichlorobenzonitrile is the main source of high-energy storage, high-power, and light-weight supercapacitors. Raw materials play a very important role in the development of aviation, aerospace and national defense modernization. However, the large am...

Claims

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Application Information

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