Synthesis method of 4-chlorobenzotrifluoride
A technology of chlorotrifluorotoluene and a synthesis method, applied in chemical instruments and methods, organic chemistry, halogenated hydrocarbon preparation, etc., can solve the problems of low absorption utilization rate of chlorine gas, low reaction yield and the like, and achieve economic benefits and social benefits. Significant benefits, easy operation, and the effect of reducing pollutant emissions
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Embodiment 1
[0029] (1) Chlorination: put 630g of p-chlorotoluene into a dehydration kettle, heat to 80°C to remove water to obtain 629g of 4-chlorobenzotrifluoride, put it into a 3L chlorination reaction kettle, heat up to 110°C, add 40g of catalyst (minutes Add in 4 batches, each batch is 10g), and start to feed dry chlorine gas with a flow rate of 40-80 m 3 / h, then add the catalyst every 30 minutes, control the temperature at 110-112°C, and the reaction time is 24 hours. After sampling and analyzing the chlorinated material as qualified, stop the chlorine flow. The p-chlorotrichlorotoluene produced by chlorination is pumped into the chlorination tank for use, and the tail gas generated by the reaction is sent to the tail gas absorption device.
[0030] (2) Fluorination: Press 4 moles of p-chlorotrichlorotoluene and 12 moles of anhydrous hydrogen fluoride into a 3L fluorination reaction kettle, open the frozen brine system, press hydrogen fluoride into the fluorination kettle with 0.2M...
Embodiment 2
[0034] (1) Chlorination: put 630g of p-chlorotoluene into a dehydration kettle, heat to 80°C to remove water, and obtain 629g of 4-chlorobenzotrifluoride, put it into a 3L chlorination reaction kettle, heat up to 110°C, add 80g of catalyst (minutes Add 4 batches, each batch is 20g), start to feed dry chlorine gas, the flow rate is 40-80 m 3 / h, then add the catalyst every 30 minutes, control the temperature at 110-112°C, and the reaction time is 20 hours. After sampling and analyzing the chlorinated material as qualified, stop the chlorine flow. The p-chlorotrichlorotoluene produced by chlorination is pumped into the chlorination tank for use, and the tail gas generated by the reaction is sent to the tail gas absorption device.
[0035] (2) Fluorination: Press 4 moles of p-chlorotrichlorotoluene and 14 moles of anhydrous hydrogen fluoride into a 3L fluorination reaction kettle, open the frozen brine system, press hydrogen fluoride into the fluorination kettle with 0.2MPa comp...
Embodiment 3
[0039] (1) Chlorination: put 630g of p-chlorotoluene into a dehydration kettle, heat to 80°C to remove water to obtain 629g of 4-chlorobenzotrifluoride, put it into a 3L chlorination reaction kettle, heat up to 110°C, add 60g of catalyst (minutes Add in 4 batches, each batch is 15g), and start to feed dry chlorine gas with a flow rate of 40-80 m 3 / h, then add the catalyst every 30 minutes, control the temperature at 110-112°C, and the reaction time is 22 hours. After sampling and analyzing the chlorinated material as qualified, stop the chlorine flow. The p-chlorotrichlorotoluene produced by chlorination is pumped into the chlorination tank for use, and the tail gas generated by the reaction is sent to the tail gas absorption device.
[0040] (2) Fluorination: Press 4 moles of p-chlorotrichlorotoluene and 13 moles of anhydrous hydrogen fluoride into a 3L fluorination reaction kettle, open the frozen brine system, press hydrogen fluoride into the fluorination kettle with 0.2M...
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