| 摘要 |
PURPOSE:To distill the titled compound containing high-boiling substances in good heat efficiency, by recovering heat energy having a gas of the titled compound recovered from the top of a column for high-boiling substances by a compressor under specific conditions, using it as heat source for specific reboilers. CONSTITUTION:In distilling 1,2-dichloroethane (EDC) containing high-boiling substances by distillation process for low-boiling substances, distillation process for high-boiling substances, and heat recovery process for a gas recovered from the top of the column for high-boiling substances, the pressure of the top of the column 305 for high-boiling substances is kept at >=0.5kg/cm<2>G, a EDC gas recovered from the top of the column is pressurized from suction pressure to >=0.5kg/cm<2> by the compressor 307 and heated from suction temperature to a temperature >=10 deg.C higher than it, and it is used as a heat source for the reboilers 314, 309, etc. of at least two columns selected from the column 305 for high-boiling substances, the column 303 for low-boiling substances, a dehydration column, EDC recovery column, and a column for vinyl chloride, etc. so that heat efficiency of EDC distillation process is extremely improved. |
