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How to Calculate Bubble Point Temperature

The bubble point temperature is the temperature at which a small portion of a liquid will vaporize and rest of the liquid will hold its composition. The temperature to be calculated is for the first single bubble formed. It is possible to calculate the bubble point temperature of any liquid, regardless of whether it is a single solution such as water or a mixture of various components.

The process involved with finding the bubble point depends on two things: temperature and pressure. A disciplined process has to be followed, with accurate calculations at each step of the process.

Liquid mixture of components with various mole fractions
Heating system
Temperature meter
Pressure meter

Instructions

- 1
  Take a mixture of liquid and insert the temperature meter. Use the pressure meter to assure the system's pressure is constant.
- 2
  Slowly heat the mixture to a base temperature.
- 3
  Calculate the convergence pressure or saturated pressure for each component.
- 4
  Divide each of the values obtained in step three by the system's constant pressure to calculate the individual K-values -- vapor-liquid equilibrium ratios.
- 5
  Multiply these K-values with the mole fraction values for each respective component to get individual Y-values -- final mole fraction values. Add all of the individual Y-values. If the total is significantly greater than 1.0, then reduce the temperature. If total is significantly less than 1.0, then increase the temperature.
- 6
  Repeat steps two through five to get a Y-value that is as close to 1.0 as possible. This is the bubble point temperature for the liquid mixture of various components

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