Introductory Chemical Engineering Thermodynamics

Appendix C. Strategies for Solving VLE Problems

In earlier chapters, we have discussed applications of VLE using simplified procedures such as bubble calculations using modified Raoult’s law. This appendix summarizes flow sheets for modified Raoult’s law and cubic equations of state.

• Section C.1 focuses on modified Raoult’s Law and offers a summary of flow sheets that quickly converge. Though you may be able to figure out other ways to converge calculations, it is often best to use strategies that have been well tested.

• Section C.2 discusses equations of state. Software permits solution of VLE using cubic equations without knowing the details of how the iterations are performed, and so a strategy is presented here also. There are many strategies ...