Method for preparing 2, 6-dichlorobenzonitrile
A technology for dichlorobenzonitrile and dichlorobenzonitrile is applied in the production field of chemically synthesizing 2,6-dichlorobenzonitrile, can solve the problems of not being able to meet market demand, difficulty in production control, low output and the like, and achieves reduction of solid The effect of waste generation, low production cost and low consumption of raw materials
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[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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