Fugacity Coefficient Formula:
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Definition: The fugacity coefficient is a measure of deviation from ideal gas behavior for a component in a mixture.
Purpose: It's used in vapor-liquid equilibrium calculations to account for non-idealities in the vapor phase.
The calculator uses the formula:
Where:
Explanation: The formula relates the fugacity coefficient to the activity coefficient, saturation pressure, K-value, and total pressure.
Details: Accurate fugacity coefficients are essential for proper phase equilibrium calculations in chemical engineering processes like distillation and absorption.
Tips: Enter the activity coefficient, saturated pressure, K-value, and total pressure. All values must be > 0.
Q1: What is the range for fugacity coefficient?
A: Typically between 0 and 1, but can exceed 1 for highly non-ideal systems.
Q2: How is the K-value determined?
A: K-values are often obtained from experimental data or thermodynamic models.
Q3: When does the fugacity coefficient equal 1?
A: For an ideal gas mixture, the fugacity coefficient equals 1.
Q4: What affects the activity coefficient?
A: Molecular interactions, temperature, pressure, and composition affect γ.
Q5: Why use this formulation?
A: The Gamma-Phi formulation combines liquid-phase non-idealities (γ) with vapor-phase non-idealities (φ).