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what is the relationship between foaming and pressure drop in a distillation column?? from the experiment that i've done in school the higher the pressure drop, the more violent the foaming... but why?

[djack77494]

nothing_changes,

I would say that foaming is a function of the fluids present and the degree to which they are agitated. To a pretty large extent in a distillation column the higher the pressure drop, the more agitation and therefore the more violent the foaming. Why? Simplistically, it's because high pressure drop = high gas velocity of the vapors being forced through the many orifices in your trays. (assuming a trayed tower)

yea it's a tray column... many thanks for your answer...