Mass Transfer
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed

q = 1
q < 1
q = 0
q > 1

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Mass Transfer
To get high tray efficiency

Time of contact between the two phases should be less
Liquid entrainment should be severe
Gas velocity should be very low
Interfacial surface between liquid and gas phase should be large

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