What Is the Antoine Equation Vapor Pressure & Binary VLE Calculator?
The Antoine equation is an empirical semi-theoretical relation describing vapor pressure of pure liquids.
Vapor-Liquid Equilibrium (VLE) models phase distribution in distillation columns.
How Does the Antoine Equation Vapor Pressure & Binary VLE Calculator Work?
Calculates pure saturation pressures P₁ˢᵃᵗ and P₂ˢᵃᵗ in mmHg.
Computes total bubble pressure P = x₁·P₁ˢᵃᵗ + (1 - x₁)·P₂ˢᵃᵗ.
Evaluates equilibrium vapor mole fraction y₁ and relative volatility α₁₂.
Antoine Equation Vapor Pressure & Binary VLE Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Antoine vapor pressure equation combined with Raoult law for ideal binary vapor-liquid equilibrium.
How to Use the Antoine Equation Vapor Pressure & Binary VLE Calculator
- Enter temperature in °C.
- Input NIST Chemistry WebBook Antoine constants A, B, C for both species.
- Enter liquid mole fraction x₁.
Step-by-Step Example Calculation
Water-Ethanol Binary Mixture at 60 °C
Input Values:
Understanding Your Result
Primary output indicates total bubble pressure in mmHg.
Summary displays vapor phase composition y₁ and relative volatility α₁₂.
Factors That Affect the Result
- Temperature (vapor pressure grows exponentially).
- Relative volatility (α > 1 indicates component 1 is more volatile).
When Should You Use This Calculator?
- Distillation column design, McCabe-Thiele calculations, and flash vessel sizing.
Assumptions & Limitations
- Assumes ideal liquid and vapor solution (activity coefficient γ = 1, fugacity coefficient φ = 1).
Frequently Asked Questions
Calculation Accuracy & Reference Note
Standard chemical engineering Antoine parameters with mmHg/°C units.