#### Azeotropes: Screencast

Explains the properties of an azeotrope for a non-ideal, binary liquid solution in vapor-liquid equilibrium

We suggest that after watching this screencast, you list the important points as a way to increase retention.

##### Important Equations:

At an azeotrope $$x_i = y_i$$ for each component $$i$$

where $$x_i$$ = the mole fraction of component $$i$$ in the liquid phase

$$y_i$$ = the mole fraction of component $$i$$ in the vapor phase

For a binary mixture, at an azeotrope, either $$P > P_1^{sat} \,\,and \,\,P_2^{sat}$$ or $$P < P_1^{sat} \,\,and \,\,P_2^{sat}$$

For a binary mixture, at an azeotrope, either $$T < T_1^{sat}\,\, and\,\, T_2^{sat}$$ or $$T > T_1^{sat}\,\, and\,\, T_2^{sat}$$

where $$P_i^{sat}$$ = saturation pressure of component $$i$$

$$T_i^{sat}$$ = saturation temperature of component $$i$$

At an azeotrope $$\frac{dP}{dx_i} = 0$$ and $$\frac{dT}{dx_i} = 0$$

Modified Raoult’s law $$x_i \gamma_i P_i^{sat} = y_iP$$

where $$\gamma_i$$ = activity coefficient of component $$i$$