Formula Used:
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Definition: This calculator determines the mole fraction of a component in the vapour phase using the Gamma-Phi formulation of Vapor-Liquid Equilibrium (VLE).
Purpose: It's essential for chemical engineers and chemists working with phase equilibria in distillation, evaporation, and other separation processes.
The calculator uses the formula:
Where:
Explanation: The formula accounts for non-ideal behavior in both liquid (γ) and vapour (φ) phases.
Details: This approach is crucial for accurate VLE calculations in real systems where ideal behavior assumptions fail.
Tips:
Q1: When should I use values other than 1 for γ?
A: Use γ > 1 for non-ideal liquid mixtures where components interact differently than in ideal solutions.
Q2: What affects the fugacity coefficient φ?
A: φ deviates from 1 under high pressures or when molecular interactions are significant in the vapour phase.
Q3: How do I obtain Psat values?
A: Use Antoine equation or vapor pressure tables for pure components at the system temperature.
Q4: Can yGas exceed 1?
A: No, if your result is >1, check your input values - this indicates impossible conditions.
Q5: What's the difference between Gamma-Phi and Raoult's Law?
A: Raoult's Law assumes ideal behavior (γ=1, φ=1), while Gamma-Phi accounts for real system deviations.