Solutions – advanced and special cases - Phenomenology of multicomponent vapor-liquid equilibrium
4 important questions on Solutions – advanced and special cases - Phenomenology of multicomponent vapor-liquid equilibrium
What happens when a pure liquid is heated at constant pressure?
. After all liquid is vaporized the temperature will increase again.
What happens when a binary mixture is heated at constant pressure to Tbub?
Starting from a liquid with x1 = 0.4, slowly heating the mixture until a tiny bubble appears. This happens at T = Tbub also called the boiling point.
This tiny bubble will contain more of species 1 than 2, since species 1 is our most volatile compound.
What happens when a binary mixture is heated at constant pressure from Tbub to T2?
More moles of both compound 1 and 2 go from liquid to vapor.
y1 decreases with respect to the situation at Tbub. The mole fraction in the vapor of compound 2 is increased.
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What happens when a binary mixture is heated at constant pressure from T2 to Tdew?
At the dew point only a tiny amount of liquid remains. The composition of the vapor is now the same as the composition of the liquid was before heating.
The tine drop of liquid that remains contains mainly compound 2.
Heating further the system will only contain vapor and no liquid.
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