Distillation tower – Inlet temperature
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For a certain tower using compressible gas as the medium, with a boiling point of -5 degrees, is it feasible to design the distillation tower such that the inlet temperature is higher than that at the bottom and top of the tower?
Yes, it’s common to do this using low-temperature distillation
Won’t this affect the temperature distribution of the tower? Why not cool it down first before distilling?
Since it is a compressible gas, is it pressure-driven liquid distillation?
As long as the heat in the tower is balanced and the feed plate is appropriate, there will be no problems; it’s also possible to save energy consumption...
Compressible gases are definitely gas mixtures, with at least two components. So which one has a temperature of -5°C, and is the other component above or below -5°C?
There’s a question: why is such a question needed? Judging from the question, the poster is not a designer; it seems odd that they would ask such questions based solely on their understanding of equipment. It is recommended to start by learning the principles of distillation related to the actual equipment used on site, in a more targeted manner. If you approach learning* with such a mindset, you will take detours; please forgive my bluntness.
Classified as a pressurized gas, but it liquefies at room temperature at around 3 kg
Indeed, the simulation results provided by the owner omit a lot of information; the purity of the raw materials is already very high, the temperatures at the top and bottom of the tower are 17/18 degrees, the feed temperature is 35 degrees, and the height of the tower is over 30 meters. So I find it strange.
This situation is truly very rare, unless there is a heat pump cycle
No, frozen brine at -15 degrees at the top is used as the cooling source for the condenser, while hot water at 70 degrees at the bottom serves as the heating source for the vertical thermosyphonic reboiler. The technology supplier is a well-known foreign company, so it should be reliable.