A co-production method and device for 3,3,3-trifluoropropene and 2-chloro-3,3,3-trifluoropropene
A technology of trifluoropropene and hydrogen fluoride, which is applied in the preparation of fluorine-containing chloroolefins and the field of fluorine-containing olefins. It can solve the problems of long reaction time, many reaction steps, and harsh high-pressure reaction conditions, and achieve automatic control of the whole process. Adjustable ratio, good effect of atom economy
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Embodiment 1
[0074] A co-production device for 3,3,3-trifluoropropene and 2-chloro-3,3,3-trifluoropropene, which includes a reaction system, a rectification pre-separation system, and an azeotrope-like extraction and separation system part;
[0075] The reaction system comprises hydrogen fluoride metering tank 1, liquid chlorine metering tank 2, tetrachloropropane metering tank 3, hydrogen fluoride metering pump 4, liquid chlorine metering pump 5, tetrachloropropane metering pump 6, hydrogen fluoride vaporizer 7, liquid chlorine vaporizer 8 , tetrachloropropane preheater 9, premixer 10, reactor 11, reaction cooler 12, described hydrogen fluoride metering tank 1 is communicated with hydrogen fluoride vaporizer 7 bottom feeding ports through hydrogen fluoride metering pump 4, hydrogen fluoride vaporizer 7 top outlets The feed port is connected to the gas phase feed port at the top of the premixer 10, the liquid chlorine metering tank 2 is connected to the feed port at the bottom of the liqui...
Embodiment 2
[0080] A co-production device for 3,3,3-trifluoropropene and 2-chloro-3,3,3-trifluoropropene as described in Example 1, the difference is: the fixed bed reactor with tubes 11. The lower head is provided with a jacket, and heat transfer oil is introduced into the jacket for heating to ensure that the feed temperature is further increased to the reaction temperature. The rectification II tower condenser 16 is cooled by -30°C to -35°C frozen brine, Further strengthen the cooling effect of other materials except hydrogen chloride, reduce material loss, and increase yield. The jacket of the phase separation condenser 21 is cooled by frozen brine with a temperature of -30°C to -35°C. The phase separator 20 The jacket is cooled by frozen brine with a temperature of -30°C to -35°C, and the upper part of the 3,3,3-trifluoropropene alkali washing tower 33 is connected with an alkali liquid input pipeline, and the 2-chloro- The middle and lower part of the 3,3,3-trifluoropropene alkali w...
Embodiment 3
[0082] Utilize the method for the coproduction of 3,3,3-trifluoropropene and 2-chloro-3,3,3-trifluoropropene by the production device described in embodiment 1 or 2, the fluorination catalyst used in the embodiment is chromium series Fluorination catalyst, comprising steps as follows:
[0083] (1) Reaction process
[0084] a) Hydrogen fluoride is pumped to hydrogen fluoride vaporizer 7 by hydrogen fluoride metering tank 1 to preheat, b) Liquid chlorine is pumped to liquid chlorine vaporizer 8 by liquid chlorine metering tank 2 to preheat, c) 1,1 is pumped by tetrachloropropane metering tank 3 , 1,3-tetrachloropropane is pumped to the tetrachloropropane preheater 9 for preheating, and the materials preheated in steps a), b), and c) are simultaneously fed into the falling film evaporation premixer 10 continuously, and the falling film evaporation premixer 10 is The temperature inside the mixer 10 is 240-300°C, the working pressure is 1.0-1.3MPa, the molar ratio of chlorine gas ...
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