1. What is Pressure of Component using K-Value Expression?

Definition: This calculator determines the total pressure of a gas component using the K-value expression from Modified Raoult's Law.

Purpose: It helps chemical engineers and researchers calculate component pressures in non-ideal vapor-liquid equilibrium systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_T \) — Total pressure of gas (Pascal)
• \( \gamma_{Raoults} \) — Activity coefficient in Raoult's Law
• \( P_{Saturated} \) — Saturated pressure (Pascal)
• \( K \) — K-value (vapor-liquid equilibrium ratio)

Explanation: The activity coefficient accounts for non-ideal behavior, while the K-value represents the distribution of components between phases.

3. Importance of Pressure Calculation

Details: Accurate pressure calculations are crucial for designing distillation columns, vapor-liquid separators, and other chemical processes.

4. Using the Calculator

Tips: Enter the activity coefficient (γ), saturated pressure (Pa), and K-value. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the activity coefficient?
A: It's a factor that quantifies how a component deviates from ideal behavior in a mixture (γ=1 for ideal solutions).

Q2: How do I determine the K-value?
A: K-values are typically obtained from experimental data or thermodynamic models for specific systems.

Q3: When is Modified Raoult's Law needed?
A: When dealing with non-ideal liquid mixtures where activity coefficients significantly differ from 1.

Q4: What units should be used?
A: Consistent pressure units (Pa, kPa, atm) must be used for both saturated and total pressures.

Q5: Can this be used for multi-component systems?
A: This calculates pressure for one component. For mixtures, you would need to perform calculations for each component.