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Definition: This calculator determines the saturated pressure of a component in vapor-liquid equilibrium (VLE) using the Gamma-Phi formulation.
Purpose: It's essential for chemical engineers and researchers working with phase equilibrium calculations in thermodynamics.
The calculator uses the formula:
Where:
Explanation: The formula relates the saturated pressure to the composition of both phases and their respective non-idealities.
Details: Accurate saturated pressure calculations are crucial for designing distillation columns, flash drums, and other separation processes.
Tips: Enter all required parameters. Mole fractions should be between 0 and 1. All other values must be positive numbers.
Q1: What is the Gamma-Phi formulation?
A: It's an approach to VLE calculations that uses activity coefficients (γ) for liquid phase non-ideality and fugacity coefficients (φ) for vapor phase non-ideality.
Q2: When is this formulation most appropriate?
A: For systems where the liquid phase significantly deviates from ideal behavior, but the vapor phase is at low to moderate pressures.
Q3: What are typical values for the fugacity coefficient?
A: For ideal gases, φ = 1. For real gases, it typically ranges between 0.8 and 1.2 at moderate pressures.
Q4: How do I determine the activity coefficient?
A: Activity coefficients can be obtained from experimental data or estimated using models like Wilson, NRTL, or UNIQUAC.
Q5: What units should be used for pressure?
A: The calculator uses Pascals (Pa), but you can convert from other units (1 bar = 100,000 Pa, 1 atm = 101,325 Pa).