its preparation method is 1, 3-dichloropropene as raw material, through secondary chlorination, secondary dehydrochlorination and isomerization. Primary chlorination: Add 1, 3-dichloropropene into a chlorination reactor with an external circulation pipeline, maintain a certain reaction temperature under light conditions, pass chlorine to the bottom of the reactor for chlorination reaction, and stop after reaching the end point Chlorine gas, introduce nitrogen to remove excess chlorine gas, the chlorinated liquid is transferred to the distillation kettle, and a small amount of polymerization inhibitor is added for vacuum distillation to obtain 1,2-dichloropropane and, the collected fraction of 105~110 ℃/13.330 kPa is 1,1,2,3-tetrachloropropane.
One-time dehydrochlorination: put 1,1,2,3-tetrachloropropane, calcium hydroxide and a certain amount of water into a stirred reactor, react at a certain temperature for several hours, add 1:1 hydrochloric acid to neutralize until acidic, and collect mixed trichloropropylene by sedimentation and stratification.
Secondary chlorination: The reaction equipment operates the same chlorination and puts into mixed trichloropropene to obtain mixed pentachloropropane.
Secondary dehydrochlorination: The production equipment operates the same dehydrochlorination, puts mixed pentachloropropane into the reaction kettle, adds calcium hydroxide, and dehydrochlorination to obtain tetrachloropropene.
Isomerization: put mixed tetrachloropropene and a small amount of isomerization catalyst into a reaction kettle equipped with a stirrer, react at a certain temperature for several hours, complete isomerization reaction, distillation under reduced pressure, and collect 102~104 ℃/13.33 kPa fraction, I .e. 1,1,2,3-tetrachloropropene.