Preparation method for 3,3,3-trifluoropropene

The invention discloses a preparation method for 3,3,3-trifluoropropene, and the preparation method comprises the following steps of: (1) taking carbon tetrachloride and ethylene as a raw material and organic peroxides as a catalyst, and reacting to prepare 1,1,1,3-tetrachloropropane, wherein the mo...

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Hauptverfasser: CHEN WEI, WANG ZHIQIANG, FANG HAITAO, NI YIFENG, LI GUOJIE, YING YONGAN, WU ZHIKUANG, YANG XINHUA, XIE FUQIN
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention discloses a preparation method for 3,3,3-trifluoropropene, and the preparation method comprises the following steps of: (1) taking carbon tetrachloride and ethylene as a raw material and organic peroxides as a catalyst, and reacting to prepare 1,1,1,3-tetrachloropropane, wherein the molar ratio of carbon tetrachloride and ethylene is (1:1)-(30:1), the reaction pressure is 0.3-1.5MPa, the reaction temperature is 50-150DEG C, and the reaction time is 2-5 hours; (2) taking the prepared 1,1,1,3-tetrachloropropane and anhydrous hydrogen fluoride as a raw material, and preparing 1,1,1-trifluoro-3-chloropropane in a reactor under the action of the catalyst and a polymerization inhibitor, wherein the molar ratio of 1,1,1,3-tetrachloropropane and anhydrous hydrogen fluoride is (1:3)-(1:50), the reaction pressure is 0.2-0.7MPa, the reaction temperature is 40-70DEG C, and the reaction time is 6-8 hours; and (3) carrying out dehydrochlorination on the prepared 1,1,1-trifluoro-3-chloropropane so as to prepar