Chemical Engineering Thermodynamics_ Lecture19_R. Ravi

Equations of state (EoS) [cont’d]
Importance of identifying the saturation pressure (L-V coexistence) among the pressures that yield three values of the specific volume at a specified temperature; converting an isotherm as predicted by the EoS to a realistic one; calculation of property changes along a path involving change of phase (up to 25 min.).
25 min. - end: Changing nature of isotherm as temperature increases up to the critical temperature; reasoning to show that the critical point is a point of inflection; application of critical point criteria to the van der Waals (vdW) EoS; expressing the critical volume, temperature and pressure in terms of the vdW parameters; inversion of these equations to obtain the vdW parameters of a given substance in terms of its critical properties; compressibility factor (defined) at the critical point; limitations of the vdW EoS.
Reference: Chapter 3 of Chemical Engineering Thermodynamics – Theory and Applications, R. Ravi. (Ane Books/CRC Press)

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