Preparation and refining method of 4-Cl-(trifluoromethyl) benzene sulfonyl chloride
A technology of trifluoromethyl and benzenesulfonyl chloride is applied in the preparation of sulfonic acid, the preparation of organic compounds, chemical instruments and methods, etc., which can solve the problems of low reaction yield, air pollution, high price, etc., and improve the reaction yield. efficiency, reducing environmental pollution, and reducing production risks
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Embodiment 1
[0025] 1.25 kg of o-chlorobenzotrifluoride, lower the temperature to below 10°C, add mixed acid dropwise, and raise the temperature to about 40°C to react after the dropwise addition. After the basic reaction of the raw materials is complete, let it stand, separate layers, take the organic phase, wash with water, and take the organic phase, which is 2-chloro-5-nitrobenzotrifluoride, which is directly used in the next step reaction.
[0026] Mixed acid configuration: Slowly add 0.43 kg of 95% nitric acid to 0.67 kg of 98% sulfuric acid at low temperature, stir evenly and cool down for later use
Embodiment 2
[0028] Add 1.25 kg of o-chlorobenzotrifluoride, 3.1 kg of acetic anhydride, and add 1.5 kg of copper nitrate in batches. After the addition, react at room temperature until the basic reaction of the raw materials is complete. Pour the reaction solution into 6 kg of crushed ice, stir, and layer , take the organic phase, and take the organic phase after washing with water, which is 2-chloro-5-nitrobenzotrifluoride, which is directly used in the next step reaction.
[0029] Preparation of the second part 4-chloro-3-(trifluoromethyl)aniline
Embodiment 3
[0031] Add 1.7 kg of iron powder, 3 kg of ethanol, and 1.4 kg of water into the reaction kettle, stir to raise the temperature to about 45°C, add 0.81 kg of concentrated hydrochloric acid, raise the temperature to 60°C to 70°C, and slowly add the above-mentioned 2-chloro-5-nitrotri Fluorotoluene solution, after the basic reaction of the raw materials is complete, adjust the reaction pH to 9 with sodium hydroxide, filter while it is hot, rinse the filter cake with a small amount of ethanol, leave the filtrate to separate layers, take the organic phase, and extract the water phase with toluene until it is free product so far,
[0032] After drying the product with anhydrous sodium sulfate, filter and distill off the toluene to obtain 0.66 kg of the product as light yellow liquid 4-chloro-3-(trifluoromethyl)aniline, the yield is 55%.
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