Formula Used:
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Definition: This calculator determines the activity coefficient for component 2 at infinite dilution using the NRTL (Non-Random Two-Liquid) equation.
Purpose: It helps chemical engineers and researchers predict non-ideal behavior of liquid mixtures at infinite dilution conditions.
The calculator uses the NRTL equation:
Where:
Details: Accurate activity coefficients are essential for phase equilibrium calculations, distillation design, and predicting mixture behavior.
Tips: Enter the NRTL coefficients (default values provided), non-randomness parameter, and temperature in Kelvin. Temperature must be > 0K.
Q1: What is infinite dilution condition?
A: It refers to the limit where the concentration of one component approaches zero while the other component is nearly pure.
Q2: Where can I find NRTL parameters?
A: They are typically obtained from experimental data or thermodynamic databases like DECHEMA or NIST.
Q3: What's a typical range for α?
A: The non-randomness parameter usually ranges between 0.2 and 0.47 for most systems.
Q4: How does temperature affect the result?
A: Higher temperatures generally decrease the activity coefficient's deviation from ideality.
Q5: Can this be used for electrolyte solutions?
A: No, the NRTL model in this form is for non-electrolyte systems. Special modifications are needed for electrolytes.