NRTL Equation Formula:
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Definition: The NRTL (Non-Random Two-Liquid) equation calculates activity coefficients in non-ideal liquid mixtures, accounting for molecular interactions.
Purpose: It's widely used in chemical engineering for phase equilibrium calculations in distillation, extraction, and other separation processes.
The NRTL equation for component 2 is:
Where:
Details: Activity coefficients quantify deviations from ideal solution behavior, crucial for accurate phase equilibrium predictions in chemical processes.
Tips:
Q1: What does the activity coefficient represent?
A: It measures how much a component deviates from ideal behavior in a mixture (γ=1 for ideal solutions).
Q2: How do I obtain NRTL parameters?
A: Parameters are typically determined by fitting experimental vapor-liquid equilibrium data.
Q3: Can this be used for multi-component systems?
A: This calculator is for binary systems. Multi-component NRTL requires additional parameters.
Q4: What's the typical range for activity coefficients?
A: They can range from 0 to ∞, but typically between 0.1 and 10 for most systems.
Q5: Why does temperature affect the activity coefficient?
A: Molecular interactions change with temperature, affecting non-ideal behavior.