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Lecture5-Rachford

# Lecture5-Rachford - Lecture 5 Isothermal Flash Calculations...

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Lecture 5: Isothermal Flash Calculations 1 Lecture 5: Isothermal Flash Calculations In the last lecture we: • Described energy and entropy balances in flowing systems • Defined availability and lost work • Derive a Gibbs Phase Rule for flowing systems • Described system specification • Showed how DePriester charts are used to tabulate K-value data for hydrocarbon systems In this lecture we’ll: • Describe an isothermal flash separation • Derive the Rachford-Rice equation • Show how to use Newton’s method to find the roots of the RR equation • Use the Rachford-Rice procedure, including Newton’s method and DePriester equilibrium data to solve a hydrocarbon isothermal flash problem.

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Lecture 5: Isothermal Flash Calculations 2 Isothermal FlashConfiguration Liquid Feed Consider the following operation which produces a liquid-vapor equilibrium from a liquid feed: Vapor out Flash Drum F, z i , T F , P F , h F For each stream: n: molar flow rate: F, L, V z i : composition variables: x,y,z T: temperature P: pressure h: enthalpy Q: heat transfer L, x i , T L , P L , h L Liquid out V, y i , T V , P V , h v Q
Lecture 5: Isothermal Flash Calculations 3 Isothermal Flash Variables Liquid Feed We showed in the last lecture that there are C+5 degrees of freedom. If we specify F, z i , T F , P F we have specified (C+3) variables and we can specify two additional variables. Vapor out

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Lecture5-Rachford - Lecture 5 Isothermal Flash Calculations...

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