VINYL CHLORIDE PRODUCTION PROCESS AND INSTALLATION Russian patent published in 1999 - IPC

FIELD: industrial organic synthesis. SUBSTANCE: vinyl chloride is obtained from reaction mixture formed in partial thermal cleavage of 1,2-dichloroethane at 450 C and elevated pressure involving distillation of hydrogen chloride. The latter is distilled off in the first distillation step and, in the second step, vinyl chloride is separated. Part of liquefied vinyl chloride is returned into the second distillation step in the form of phlegm. The rest of liquefied vinyl chloride is introduced into the third distillation step where all amount of hydrogen chloride together with part of vinyl chloride are stripped to be recycled into the first distillation step, wet hydrogen chloride being preliminarily passed through drying zone to be essentially freed of water. Installation comprises cleavage zone, three above-indicated distillation steps, and hydrogen chloride drying zone. In the latter, driers are operated in parallel mode and as drying means, silica gel and molecular sieves are utilized. EFFECT: improved process flowsheet and reduced equipment corrosion. 7 cl, 1 dwg, 4 ex