PURPOSE: To prevent heat flow passing through a separation device and to improve the separation efficiency of a distillation column by providing a gas chamber between two walls of the separation device, which functions in the longitudinal direction at the central zone of the distillation column and setting the space between the both walls to a specified value.
CONSTITUTION: The distillation column 1 is divided by a separation device 5 into a feeding part 2 and a withdrawing part 3, which separation device 5 functions in the longitudinal direction at the central zone of the distillation column 1. The separation device 5 is constituted of two walls 4 and has a gas chamber between the walls. The distance between the walls is 1 to 50 mm. An inert gas is charged from an inert gas inlet 6 provided at the upper terminal part of the gas chamber and is introduced into a distillation chamber from an inert gas outlet 7 provided at the lower terminal part. A mixture of plural substances A, B, C is fed into a feeding part 2 and the substances are separated according to the order of the volatility of each substance into each pure fraction. The fraction A having high volatility and the fraction C having low volatility are withdrawn from the distillation column 1 as a overhead product and a bottom product, respectively. The fraction B having intermediate volatility is withdrawn from the side part of the distillation column as a side distillate product.
STROEZEL MANFRED (DE)
PFEFFINGER JOACHIM (DE)
| JPS59142801A | 1984-08-16 |