The problem of reflux extraction in pressurized distillation
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Our laboratory has just built a pressurized distillation column (of the external reflux type), with the reflux rate controlled to regulate the product yield, and the reflux liquid being regulated via a rotameter. In practical operation, during atmospheric distillation, all reflux and product withdrawals proceed normally ； However, under pressure, there is liquid backflow in the rotameter; moreover, some of the liquid from this backflow also flows into the receiving tank on its own (when no liquid is being extracted). I hope the experts here can help analyze and solve this issue. Thank you! 999!
After pressurization, the heat at the bottom of the tower should be high; this is mainly because the process is compressed after pressurization, with no material at the top.
Reflux extraction under normal pressure works normally, but once pressure is applied, there is no reflux and no extraction occurs; it seems as though all the steam is getting trapped in the condenser. What could be the problem?
Reply to 3# kmusic: Try draining the accumulated non-condensable gas from the top of the condenser.
How is pressure balance control achieved in pressure distillation?
Doesn’t the system pressure decrease after it’s drained? It’s been scheduled this time, but if it’s still like this next time, it won’t solve the problem
Is it necessary to install some type of balance pipe or a back pressure regulating valve or something similar?
Who has the process diagram for pressure-driven distillation? I’d like to take a look
During pressure-driven distillation operations, venting is necessary. Pressure control is primarily achieved through temperature – a certain temperature corresponds to a certain pressure. The operation involves increasing the temperature while simultaneously venting; if the temperature reaches the target value but the pressure does not, venting must continue. Additionally, balance pipes are required between the tank and the top of the tower； Another method is to use a positive-displacement heat exchanger for controlling the tower top pressure.
You can solve the problem by adding a balance pipe between the receiver tank and the tower top.
I think it’s due to an imbalance in pressure; a balance pipe needs to be added.