Questions regarding the independent control of tower top pressure and reflux drum pressure
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The pressure at the top of the tower is controlled at 0.05–0.07 MPa, while the pressure in the reflux tank is controlled at 0.03–0.05 MPa. I’m not quite sure about the purpose of controlling each of these pressures separately; it seems that if the pressure at the top of the tower is controlled, then the pressure in the reflux tank should also be under control. So why are there separate control valves for each?
Is the condenser directly connected to the reflux tank and the tower? Should it be controlled whether the gas phase needs to pass through a heat exchanger?
This control mechanism involves maintaining a constant differential pressure between the tower top and the reflux drum; it works pretty well. However, it won’t function properly if there is non-condensable gas present~
This is controlled by adjusting the flow rate through two control valves: one at the top of the PIC tower and another in the PIC reflux tank. Because the process requires a pressure difference between the two pressures.
Can it be understood in this way that the pressures at the top of the tower and in the reflux tank are similar and relatively low? To ensure the proper operation of the tower, it is necessary to maintain a certain pressure difference between them. Since this pressure difference is small, it is better to control the pressures on each side separately
The tower top pressure is controlled by adjusting the heat exchange area.
The pressure control of the reflux tank is equivalent to a differential pressure valve