NRTL Equation Formula:
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Definition: The activity coefficient (γ) measures how much a component in a mixture deviates from ideal behavior. The NRTL (Non-Random Two-Liquid) model calculates activity coefficients for liquid mixtures.
Purpose: This calculator determines the activity coefficient of component 1 in a binary mixture using the NRTL equation, which is widely used in chemical engineering for phase equilibrium calculations.
The NRTL equation for component 1 is:
Where:
Details: Activity coefficients are crucial for accurate phase equilibrium calculations, distillation design, and predicting vapor-liquid equilibrium in non-ideal mixtures.
Tips:
Q1: What does the activity coefficient tell us?
A: It quantifies how much a component deviates from ideal solution behavior (γ=1 means ideal).
Q2: How do I get NRTL parameters for my system?
A: Parameters are typically found in thermodynamic databases or determined experimentally.
Q3: Why does temperature affect the activity coefficient?
A: Molecular interactions change with temperature, affecting non-ideality.
Q4: Can this calculator be used for multicomponent systems?
A: No, this is for binary systems only. Multicomponent NRTL is more complex.
Q5: What's a typical value for the α parameter?
A: Usually between 0.1 and 0.3, with 0.2 being common for many systems.