Mass Transfer
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that

The system comprises of miscible liquids
The system comprises of an azeotrope
The system comprises of partially mis-cible liquids
On heating, a vapor phase will appear ; while on cooling, a solid phase will appear

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Slope of the operating line in stripping section decreases
Total cost first decreases and then increases
Number of plates decreases very slowly first and then more and more rapidly
Liquid flow increases while the vapor flow decreases for a system

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