1. What is Saturated Pressure in VLE?

Definition: Saturated pressure is the pressure at which a given liquid and its vapour can co-exist in equilibrium at a given temperature.

Purpose: This calculator determines the saturated pressure using Raoult's Law in vapor-liquid equilibrium (VLE) calculations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{sat} \) — Saturated pressure (Pascal)
• \( y_{Gas} \) — Mole fraction of component in vapor phase
• \( P_T \) — Total pressure of gas (Pascal)
• \( x_{Liquid} \) — Mole fraction of component in liquid phase

Explanation: The formula is derived from Raoult's Law which relates the vapor and liquid phase compositions at equilibrium.

3. Importance of Saturated Pressure Calculation

Details: Accurate saturated pressure calculations are crucial for designing distillation columns, flash drums, and other separation processes in chemical engineering.

4. Using the Calculator

Tips: Enter the mole fraction in vapor phase (0-1), total pressure in Pascals, and mole fraction in liquid phase (0-1). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is Raoult's Law?
A: Raoult's Law states that the partial vapor pressure of a component is equal to the vapor pressure of the pure component multiplied by its mole fraction in the liquid phase.

Q2: When is Raoult's Law applicable?
A: Raoult's Law works well for ideal solutions where intermolecular forces between different molecules are similar to those between like molecules.

Q3: What if my system is non-ideal?
A: For non-ideal systems, you would need to use modified Raoult's Law with activity coefficients or other thermodynamic models.

Q4: What units should I use for pressure?
A: The calculator uses Pascals (Pa), but you can convert from other units (1 atm = 101325 Pa, 1 bar = 100000 Pa).

Q5: Can I use this for multicomponent systems?
A: This calculator is for binary systems. For multicomponent systems, you would need to solve simultaneous equations for all components.