| 摘要 |
Method of operating a distillation column for removing water and components which boil more readily than 1,2-dichloroethane from 1,2-dichloroethane, in which at least some of the heat of condensation of the hydrous vapours of the distillation column is used for the evaporative concentration of sodium hydroxide solution, also at least some of the 1,2-dichloroethane formed from chlorine and ethylene in a direct chlorination can be used for heating that distillation column and then likewise be used as heat-transfer medium for the evaporative concentration of sodium hydroxide solution. |
