| 摘要 |
PROBLEM TO BE SOLVED: To provide an economic distillation method in a vinyl chloride distillation column in obtaining vinyl chlorids from a thermal decomposition gas of 1,2-dichloroethane through a distillation process. SOLUTION: This method for distillation is carried out in such a manner that a mixture consisting essentially of 1,2-dichloroethane and vinyl chloride obtained by distillation and separation by a HCl column 3 from a thermal decomposition product consisting essentially of 1,2-dichloroethane, vinyl chloride and hydrogen chloride prepared by thermal decomposition of 1,2-dichloroethane by a thermal decomposition furnace 1 is fed to a distillation column 4 and distilled, purified vinyl chloride is distilled off from the top of the column and a fraction consisting essentially of 1,2-dichloroethane is taken out from the bottom of the column, a mixture consisting essentially of 1,2-dichloroethane and vinyl chloride is fed to a middle plate of the distillation column, a liquid in the column such as a liquid in the column lower than >=50 deg.C than the temperature of a liquid at the bottom of the column is taken out from the middle plate between a feed plate and the bottom of the column, heated by a side reboiler 5 and fed to the column.
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