How to control the circulation volume in the pressure swing distillation cycle
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Recently, a pressure-swinging distillation column for acetonitrile-water is being designed, with the vacuum column coming first and the pressurized column following; the vapor from the top of the pressurized column is recycled back to the vacuum column. How can the circulation rate indicated in the ASPEN simulation results be controlled in actual operation? Additionally, under the condition that the feed volume and composition remain stable, how can pressure stability in this pressure-swinging distillation system be ensured?
Acetonitrile-water pressure swing distillation column, supporting the original poster.
As long as you believe the software is giving correct calculations, the pressure should of course be controlled according to those values, while the flow rate should be controlled based on the operational parameters
The pressure in the vacuum tower can be controlled by using a control valve to create a vacuum; the pressure in the pressure tower can be thermally coupled with that of the vacuum tower, and it can also be adjusted by introducing nitrogen or by controlling the liquid level in the reboiler. The circulation rate is controlled by the control valve to ensure proper output from the top of the tower, thereby keeping the bottom of the tower in good condition. We can design the process package; please contact me if needed.