Bubble point

Calculating the bubble point

At the bubble point, the following relationship holds:

:\sum_{i=1}^{N_c} y_i = \sum_{i=1}^{N_c} K_i x_i = 1 where

:K_i \equiv \frac{y_{ie}}{x_{ie}}. K is the distribution coefficient or K factor, defined as the ratio of mole fraction in the vapor phase \big(y_{ie}\big) to the mole fraction in the liquid phase \big(x_{ie}\big) at equilibrium. When Raoult's law and Dalton's law hold for the mixture, the K factor is defined as the ratio of the vapor pressure to the total pressure of the system:

:K_i = \frac{P'_i}{P}

Given either of x_i or y_i and either the temperature or pressure of a two-component system, calculations can be performed to determine the unknown information.

References

References

1. (1997). "[[Perry's Chemical Engineers' Handbook]]". McGraw-hill.