Transcription of PROCESS MODELLING SELECTION OF THERMODYNAMIC …
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PROCESS MODELLING SELECTION OF THERMODYNAMIC …
PROCESS MODELLING . SELECTION OF. THERMODYNAMIC METHODS. by John E. Edwards Download available from P & I Design Ltd MNL031 05/01. 2 Reed Street, Thornaby, UK, TS17 7AF Page 1 of 15. Tel: 00 44 (1642) 617444. Fax: 00 44 (1642) 616447. PROCESS MODELLING SELECTION of THERMODYNAMIC Methods Contents Introduction THERMODYNAMIC Fundamentals THERMODYNAMIC Energies Gibbs Phase Rule Enthalpy System Phases Single Phase Gas Liquid Phase Vapour liquid equilibrium Summary Appendices I Enthalpy Calculation in CHEMCAD. II THERMODYNAMIC Model SELECTION Vapour Liquid Equilibrium Figures 1 Ideal Solution Txy Diagram 2 Enthalpy Isobar 3 THERMODYNAMIC Phases 4 van der Waals Equation of State 5 Relative Volatility in VLE Diagram 6 Azeotrope Value in VLE Diagram 7 VLE Diagram and Convergence Effects 8 Chemcad K and H Values Wizard 9 THERMODYNAMIC Model Decision Tree 10 K Value and Enthalpy Models SELECTION Basis References 1.
The selection of a suitable thermodynamic model for the prediction of enthalpy (H) and phase equilibrium (K) is fundamental to process modelling. Selection of an inappropriate model will result in convergence problems and erroneous results. The selection process is driven by considering the following:- Process species and compositions.
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