Fugacity of component i in Vapor phase

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Jul 24, 2020, 6:28:07 PM

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Dec 14, 2013, 6:00:07 AM

{\hat{f}}_{i}^{V} = y_{i} \cdot {\hat{φ}}_{i} \cdot P

$hatf_i^V = y_i * hatvarphi_i * P$

(y_{i}) mole fraction of component in vapor

$(y_i)"mole fraction of component in vapor"$

({\hat{φ}}_{i}) fugacity coefficient of component i in the vapor

$(hatvarphi_i)"fugacity coefficient of component i in the vapor"$

(P) System Pressure

$(P)"System Pressure"$

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Fugacity can be thought of as the activity of a gas. The fugacity of a component in a mixture at equilibrium is the same whether in vapor or liquid phase. This equation defines the fugacity of a component in a vapor using the component characteristics of: mole fraction, system pressure, and fugacity coefficient of component in vapor.

The fugacity coefficient ${\hat{φ}}_{i}$ $hatvarphi_i$ , for component $i$ $i$ in the vapor is calculated from an equation of state (e.g., Virial). Sometimes it is approximated by a pure component value from a correlation. The fugacity coefficient is a correction for vapor phase non-ideality. Often at pressures close to atmospheric, ${\hat{φ}}_{i}$ $hatvarphi_i$ = 1

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Fugacity of component i in Vapor phase

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