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unsw ceic3001 lecture w3 advance thermo

unsw ceic3001 lecture w3 advance thermo - SCHOOL OF...

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1 SCHOOL OF CHEMICAL ENGINEERING CEIC3001 Advanced Thermodynamics and Separation NON-IDEALITY IN THE LIQUID PHASE CONTENTS VLE by Modified Raoult's Law ....................................................................................... 2 Partial Molar Properties .................................................................................................... 3 The Ideal Solution ............................................................................................................ 5 The Activity Coefficient: Species i in a Solution of Liquids ........................................... 6 Models for the Excess Gibbs Energy ............................................................................... 7 Margules Equations ...................................................................................................... 7 Non-ideal gas and non-ideal solution: the Gamma/Phi Formulation of VLE ................ 10 HIGHLIGHTS 1. The Modified Raoult’s Law describes an equilibrium system where the vapour behaves as an ideal gas and the liquid mixture is a non-ideal solution . 2. The deviation of each species i from non-ideal solution behaviour is described by an activity coefficient i : sat i i i i P x P y 3. The deviation of a a liquid mixture from ideal solution behaviour is measured by the excess Gibbs energy G E 4. Several models can be used to correlate and predict activity coefficients, of which the Margules equation is one of the simplest, with only two parameters for a binary system. 5. When the vapour is not an ideal gas and the liquid mixture is not an ideal solution, the Gamma-Phi formulation may be used to describe VLE: sat i i i i i P x P y 6. i and i depend on T, P and composition in a complex manner and are usually calculated using computer simulation software.
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