1. What is Extraction Factor at Feed Point Slope?

Definition: The Extraction Factor is defined as the ratio of the slope of equilibrium line to the slope of operating line at the feed point in liquid-liquid extraction processes.

Purpose: It helps chemical engineers determine the efficiency of solute transfer between phases in extraction operations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \epsilon \) — Extraction Factor (dimensionless)
• \( m_F \) — Feed point slope of equilibrium curve
• \( S' \) — Solute free solvent flowrate (kg/s)
• \( F' \) — Solute free feed flowrate (kg/s)

Explanation: The product of equilibrium slope and solvent flowrate is divided by feed flowrate to determine the extraction efficiency.

3. Importance of Extraction Factor

Details: Proper calculation ensures optimal design of extraction columns, predicts separation efficiency, and helps in scaling up processes.

4. Using the Calculator

Tips: Enter the equilibrium slope (m_F), solvent flowrate (S'), and feed flowrate (F'). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does the extraction factor tell us?
A: It indicates the potential for solute transfer - values >1 suggest good extraction, while <1 suggests poor extraction.

Q2: How is the equilibrium slope (m_F) determined?
A: It's the distribution coefficient at feed conditions, typically from equilibrium data or correlations.

Q3: What are typical units for flowrates?
A: While kg/s is shown, any consistent mass flow units can be used (kg/h, lb/hr, etc.).

Q4: When would the extraction factor vary in a process?
A: It can change with temperature, composition, or if equilibrium relationship is nonlinear.

Q5: How does this relate to theoretical stages?
A: Higher ε values typically require fewer theoretical stages for the same separation.