Distillation column operation
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This post was last edited by Refiner on 2018-7-25 07:48. If the reflux temperature decreases, can normal separation be achieved by reducing the reflux rate in order to control the top temperature of the tower?
Each distillation section has a distillation curve: 1 ensures there are sufficient trays, 2 requires a certain reflux ratio, and 3 involves the control of pressure and temperature. Therefore, a normal separation effect cannot be achieved.
As the reflux temperature decreases while the top temperature remains unchanged, a reduction in reflux has no effect on the distillates at the tower top within a certain range; this range depends on factors such as the temperatures of the distillates flowing downward from the tower top, such as those at the diesel extraction point, the richly absorbed oil returning to the tower, and the intermediate stream returning to the tower, as well as any changes in the flow rate of these streams returning to the tower
With all other conditions unchanged, the reflux temperature decreases； The normal tower top temperature can be controlled by reducing the reflux flow. Thereby achieving a separation effect