1. What is Extraction Factor based on Raffinate Point Slope?

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

Purpose: It helps chemical engineers determine the efficiency of solute transfer from feed to solvent in extraction operations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \epsilon \) — Extraction Factor (dimensionless)
• \( m_R \) — Raffinate Point Slope of Equilibrium Curve
• \( S' \) — Solute Free Solvent Flowrate (kg/s)
• \( F' \) — Solute Free Feed Flowrate (kg/s)

Explanation: The extraction factor compares the capacity of the solvent to extract solute relative to the amount of solute in the feed.

3. Importance of Extraction Factor

Details: A higher extraction factor indicates more efficient solute transfer. Values >1 indicate favorable extraction conditions.

4. Using the Calculator

Tips: Enter the raffinate point slope, solvent flowrate, and feed flowrate. All values must be > 0. Flowrates should be solute-free basis.

5. Frequently Asked Questions (FAQ)

Q1: What does the raffinate point slope represent?
A: It's the distribution coefficient of solute between phases at the raffinate composition (m_R = y/x at raffinate point).

Q2: What's a typical range for extraction factor?
A: Industrial processes typically aim for ε between 1.5 and 3 for efficient operation.

Q3: How do I determine the raffinate point slope?
A: It's determined experimentally from equilibrium data or thermodynamic models of the system.

Q4: Why use solute-free flowrates?
A: Solute-free basis simplifies calculations as solute concentration changes during extraction.

Q5: What if my extraction factor is less than 1?
A: ε < 1 indicates poor extraction efficiency - consider increasing solvent flow or changing solvents.