1. What is Saturated Fugacity Coefficient?

Definition: The saturated fugacity coefficient is the ratio of the saturated fugacity of a species to the saturated pressure of a species.

Purpose: It helps in thermodynamic calculations to determine the deviation of real gases from ideal behavior at saturation conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \phi^{sat} \) — Saturated fugacity coefficient (dimensionless)
• \( f^{l} \) — Fugacity of liquid phase species (Pa)
• \( P^{sat} \) — Saturated pressure (Pa)
• \( P.F. \) — Poynting factor (dimensionless)

Explanation: The fugacity of the liquid phase is divided by the product of saturated pressure and Poynting factor to get the saturated fugacity coefficient.

3. Importance of Saturated Fugacity Coefficient

Details: This coefficient is crucial in phase equilibrium calculations, particularly in vapor-liquid equilibrium and chemical process design.

4. Using the Calculator

Tips: Enter the fugacity of liquid phase species in Pascals, saturated pressure in Pascals, and Poynting factor. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the physical significance of the Poynting factor?
A: The Poynting factor accounts for the change in fugacity as pressure changes from saturated pressure to system pressure at constant temperature.

Q2: What's a typical range for saturated fugacity coefficient?
A: For most systems, it ranges between 0.9 and 1.1, but can vary significantly depending on conditions.

Q3: When would the Poynting factor be significantly different from 1?
A: At high pressures or when there are large differences between system pressure and saturation pressure.

Q4: How is fugacity different from pressure?
A: Fugacity is an "effective pressure" that accounts for non-ideal behavior in real gases and liquids.

Q5: Can this calculator be used for any chemical species?
A: Yes, as long as you have accurate values for all input parameters.