Extension to General Flash Calculations

The isothermal flash algorithm described above may be incorporated into an iterative scheme for solving other types of flash calculations. The isothermal flash routine becomes a module in an outer computational loop in which either the temperature or the pressure is varied to satisfy a given specification. 

Carry out an isothermal flash calculation at the given pressure, P, and the current temperature, T. 

If Equation 2.8 is satisfied within some given tolerance, a solution to the problem has been reached. If the error is greater than the tolerance, proceed to the next step. 

Use an interpolative-extrapolative technique to predict the temperature for the next trial and repeat the calculations beginning at step 2. In the first two iterations, the temperature is estimated independently to start the calculations. 

EXAMPLE 2.7 PHASE SEPARATION AT GIVEN TEMPERATURE AND PRESSURE 

---