AutoEngCalc - Engineering Calculators

Phase Equilibria Calculators

Advanced tools for vapor-liquid equilibrium and phase behavior analysis. Calculate VLE diagrams, flash separations, and vapor pressures.

VLE: Water-Ethanol, T=78°C
Azeotrope: 95.6% EtOH

Phase Equilibria Calculators

Advanced tools for vapor-liquid equilibrium and phase behavior analysis

Binary Vapor-Liquid Equilibrium (VLE)

Calculate phase equilibrium for binary systems and generate T-x-y and P-x-y diagrams

Multicomponent Flash Calculation

Determine equilibrium phase compositions for multicomponent systems

Components
Component Feed Composition (mol%) Antoine Coefficients (A, B, C)

Vapor Pressure Modeling

Model vapor pressure as a function of temperature using various equations

Antoine Equation Parameters

log10(P) = A - B/(T + C) where P is in mmHg and T is in °C

Calculation Results

Bubble Point

- °C

Dew Point

- °C

Azeotrope

-

Vapor Fraction

-

Liquid Fraction

-

Flash Results
Component Vapor Phase (mol%) Liquid Phase (mol%) K-value
Water - - -
Ethanol - - -
Vapor Pressure Results
T (°C) P (kPa)
0 -
25 -
50 -
75 -
100 -
T-x-y Diagram
Phase Diagram Visualization

Phase Equilibria Fundamentals

Vapor-Liquid Equilibrium

VLE describes the distribution of components between vapor and liquid phases at equilibrium.

yiP = xiPisat

For non-ideal systems, activity coefficients (γ) are used:

yiP = xiγiPisat

Flash Calculations

Flash calculations determine phase fractions and compositions at equilibrium.

Σ(zi(Ki - 1)/(1 + V(Ki - 1)) = 0

Where zi is feed composition and Ki is the equilibrium ratio (yi/xi).

Additional Thermodynamics Resources

VLE Data Sources

Access thermodynamic databases

Activity Coefficient Models

Learn about Wilson, NRTL, UNIQUAC

Flash Calculation Methods

Numerical techniques for flash

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