In ASPEN, what is the difference between the liquid phase at the top of the distillation column and the gas phase at the top?
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I am self-studying Mr. Sun Lanyi’s books. In ASPEN HYSYS, for the design of simple distillation columns, it is necessary to determine on the initial pages for setting up the flow rates in the column design whether the gas phase or liquid phase will be at the top of the column. For this, it is necessary to first calculate the dew point and bubble point, and determine whether the phase is liquid or gas based on the exit temperature and pressure ； Or have I missed something? It seems that in the textbook it’s determined quite easily, in just one sentence.
It’s not explained in detail; it’s quite simple to determine from the textbook whether the product at the top of the tower is in gas phase or liquid phase. I think it’s determined by using different models for calculating bubble points and dew points, which then indicate whether the product at the top of the tower is in gas phase or liquid phase.