Preparation method for 3,3,3-trifluoropropene
A technology of trifluoropropylene and ethylene, applied in the field of preparation of trifluoropropylene, can solve the problems of unsafe production, high price, complicated process, etc., and achieve the effects of low cost, easy control and process safety
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Embodiment 1
[0028] Step 1: In a 100L stainless steel reactor, add 90kg of carbon tetrachloride and 20g of organic peroxide catalyst benzoyl peroxide, replace the oxygen in the reaction vessel with nitrogen, then heat up to 50°C, and then continuously pass Add 16.24kg of ethylene, the pressure in the kettle is 0.3Mpa, and the reaction is completed in 2 hours, and the selectivity can be 90-95% of 1,1,1,3-tetrachloropropane.
[0029] Step 2: Add 60kg of the prepared 1,1,1,3-tetrachlorocycloalkane into the reactor containing the mixture of catalyst difluorotin dichloride and polymerization inhibitor cyclobutanone, and heat up to 40°C , and then continuously add 19.8kg of anhydrous hydrogen fluoride within 6-8 hours, and control the pressure at 0.2Mpa to obtain 1,1,1-trifluoro-3-chloropropane with a selectivity of 90-99%.
[0030] The third step: In a 100L enamel reaction kettle, 70kg of sodium hydroxide aqueous solution, 0.6kg of dodecyltrimethylammonium chloride, the reaction temperature is ...
Embodiment 2
[0032] The first step: In a 100L stainless steel reactor, add 90kg of carbon tetrachloride and 15g of organic peroxide di-tertbutyl peroxide, replace the oxygen in the reaction vessel with nitrogen, then heat up to 150°C, and then continuously pass Add 0.54kg of ethylene, the pressure in the kettle is 1.5Mpa, and the reaction is completed in 3 hours, and the selectivity can be 90-99% of 1,1,1,3-tetrachloropropane.
[0033]Step 2: Add 12 kg of the prepared 1,1,1,3-tetrachlorocycloalkane into the reactor containing the mixture of the catalyst difluorotin dichloride and the polymerization inhibitor cyclobutanone, and heat up to 70°C , and then continuously add 66kg of anhydrous hydrogen fluoride within 6-8 hours, and control the pressure at 0.7Mpa to obtain 1,1,1-trifluoro-3-chloropropane with a selectivity of 90-96%.
[0034] The third step: In a 100L enamel reaction kettle, 70kg of sodium hydroxide aqueous solution, 1kg of dodecyltrimethylammonium chloride, the reaction tempera...
Embodiment 3
[0036] Step 1: In a 100L stainless steel reactor, add 90kg of carbon tetrachloride and 5g of organic peroxide catalyst 1,1-di-tert-butylperoxycyclohexane, replace the oxygen in the reaction vessel with nitrogen, and then heat up When the temperature reached 150°C, 16.24kg of ethylene was continuously fed in, the pressure in the kettle was 1.5Mpa, and the reaction was completed in 3 hours, and 1,1,1,3-tetrachloropropane with a selectivity of 80-85% could be obtained.
[0037] Step 2: Add 60 kg of the prepared 1,1,1,3-tetrachlorocycloalkane into the reactor containing the mixture of the catalyst difluorotin dichloride and the polymerization inhibitor cyclobutanone, and heat up to 70°C , and then continuously add 19.8kg of anhydrous hydrogen fluoride within 6-8 hours, and control the pressure at 0.7Mpa to obtain 1,1,1-trifluoro-3-chloropropane with a selectivity of 90-99%.
[0038] The third step: In a 100L enamel reaction kettle, 70kg of sodium hydroxide aqueous solution, 0.8kg ...
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