Fugacity of Liq. Phase Species using Poynting Factor Correlation Calculator

Fugacity Formula:

\[ f_l = \phi^{sat} \times P^{sat} \times \exp\left(\frac{V_l \times (P - P^{sat})}{R \times T}\right) \]

Saturated Fugacity Coefficient (φ^sat):

Saturated Pressure (P^sat):

Volume of Liquid Phase (V_l):

m³

Pressure (P):

Temperature (T):

Fugacity of Liquid Phase (f_l):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Fugacity of Liquid Phase Species?

Definition: Fugacity is a thermodynamic property that effectively represents the "escaping tendency" of a component from a phase. For liquid phase species, it's calculated using the Poynting factor correlation.

Purpose: This calculation is essential in chemical engineering for phase equilibrium calculations, particularly in distillation, absorption, and other separation processes.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ f_l = \phi^{sat} \times P^{sat} \times \exp\left(\frac{V_l \times (P - P^{sat})}{R \times T}\right) \]

Where:

\( f_l \) — Fugacity of liquid phase species (Pa)
\( \phi^{sat} \) — Saturated fugacity coefficient (dimensionless)
\( P^{sat} \) — Saturated pressure (Pa)
\( V_l \) — Molar volume of liquid phase (m³/mol)
\( P \) — System pressure (Pa)
\( T \) — Temperature (K)
\( R \) — Universal gas constant (8.314 J/mol·K)

Explanation: The formula accounts for deviations from ideal gas behavior through the fugacity coefficient and pressure effects through the Poynting factor (exponential term).

3. Importance of Fugacity Calculation

Details: Accurate fugacity calculations are crucial for predicting phase equilibria in chemical processes, designing separation systems, and modeling non-ideal fluid behavior.

4. Using the Calculator

Tips: Enter all required parameters with consistent units. Default values are provided for demonstration. Temperature must be in Kelvin, pressures in Pascals, and volume in cubic meters.

5. Frequently Asked Questions (FAQ)

Q1: What is the physical meaning of fugacity?
A: Fugacity represents the effective pressure of a real gas or liquid that would give the same behavior as an ideal gas at the same conditions.

Q2: When is the Poynting correction significant?
A: The Poynting factor becomes important when system pressure differs significantly from the saturation pressure.

Q3: What's a typical range for φ^sat?
A: For many substances near their normal boiling point, φ^sat ranges from 0.9 to 1.1, but can vary more widely at extreme conditions.

Q4: How do I find V_l for my substance?
A: Liquid molar volumes can be found in chemical engineering handbooks or estimated from density data.

Q5: Can this be used for mixtures?
A: This calculates pure component fugacity. For mixtures, activity coefficients would also be needed.