Reflux problems in atmospheric and vacuum distillation
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Some time ago, I drew a vacuum distillation tower, but during the final review of the design, I suddenly realized that there seemed to be some issue with the side-stream reflux of the tower! I’m a bit unsure, so I’m asking everyone: does the side-line reflux actually involve withdrawing the vapor after it has been condensed? Should I cool the extractive phase first and then reflux it? The atmospheric tower and vacuum tower that I started drawing involve reflux after cooling the liquid phase; I’m not sure if they are drawn correctly! !
At the top of the tower is gas-phase condensation, while in the middle section there is liquid-phase cooling.
I’m embarrassed; I’m not sure about this either. Looking forward to the correct answer below. Since the main function of the side line is to remove heat, and considering that the minimum reflux ratio needs to be calculated, I believe the liquid phase should be withdrawn and cooled before being recycled. A ‘heat exchanger’ is used for heat removal on the side line, a ‘condenser’ at the top of the tower, and a ‘reboiler’ at the bottom; the names correspond to their functions.
Reply to 3# cordone: To be honest, this is basic common sense in the field of chemistry, but I, as a novice, kept ignoring it; it’s really embarrassing that I only asked about it now! I’m ready; I’m prepared to take criticism. . . . sweat····
Reply to 4# 691603294: It’s okay, let’s face it together; after all, it’s because we don’t understand.
Reply 5# cordone Yeah! Learn together*, and keep improving! Just as it says in your picture, “Diligence can make up for lack of talent”! By the way, I haven’t asked what you do as a job I work in ritual services!
Reply to 6# 691603294: The manufacturing unit; just graduated
Firstly, there is no such concept as a reflux ratio for side-line reflux; it is used merely to extract heat and achieve thermal equilibrium within the tower, thereby reducing its diameter； Second, according to theoretical calculations, the side stream should be discharged at the bubble point.
Reply 7# cordone OMG! I’m about the same – it’s been a year since I graduated!
The extracted liquid phase is cooled before being fed back into the tower as reflux.
Reply to 10# ChemicalMan: Is it only at the top of the tower that vapor condensation occurs? Are there any other methods for vacuum-phase condensation and reflux?