Lecture4-FlowingSystems

Lecture4-FlowingSystems - Lecture 4 Phase Equilibrium in...

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Lecture 4: Phase Equilibrium in Flowing Systems 1 Lecture 4: Phase Equilibrium in Flowing Systems In this lecture we’ll show: • How to apply thermodynamics to flowing systems • Energy and entropy balances in flowing systems • Availability and lost work • Gibbs Phase Rule for flowing systems and system specification • How data of mixture compositions are sometimes tabulated graphically. • Graphical determination of vapor-liquid equilibrium of hydrocarbon systems Last lecture primarily focused on the thermodynamics of separations. We covered: • Phase Stability and the Gibbs phase rule. • A simple separation based on a vapor-liquid phase diagram. • The lever rule. • Equilibrium ratios (K-values, distribution coefficients, etc.). • The activity, and activity coefficients. • Measures of separations.
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Lecture 4: Phase Equilibrium in Flowing Systems 2 Separation System Flows Streams in We can use the tools of entropy, energy, availability and mass balances to analyze any separations system: ... ... ... ... Streams out Heat in and heat out Work in and work out n, z i , T, P, h, s, b, v For each stream: n: molar flow rate z i : composition variables T: temperature P: pressure h: enthalpy s: entropy b: availability v: specific volume (w s ) in (w s ) out Q in Q out n, z i , T, P, h, s, b, v T 0
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