1. What is Stripping Section Flowrate of Liquid?

Definition: This calculator determines the molar flowrate of liquid in the stripping section of a distillation column based on the rectifying section flowrate, feed quality, and feed flowrate.

Purpose: It helps chemical engineers and process designers calculate liquid flowrates in distillation columns for proper design and operation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L_m \) — Liquid flowrate in stripping section (mol/s)
• \( L_n \) — Liquid flowrate in rectifying section (mol/s)
• \( q \) — Feed quality (dimensionless)
• \( F \) — Feed flowrate (mol/s)

Explanation: The liquid flowrate in the stripping section equals the rectifying section flowrate plus the product of feed quality and feed flowrate.

3. Importance of Flowrate Calculation

Details: Accurate flowrate calculations are essential for designing distillation columns, determining tray efficiencies, and ensuring proper separation of components.

4. Using the Calculator

Tips: Enter the liquid flowrate in the rectifying section, feed quality (typically between 0 and 1), and feed flowrate. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What does feed quality (q) represent?
A: Feed quality represents the fraction of feed that is liquid, where q=1 means all liquid and q=0 means all vapor.

Q2: How do I determine the rectifying section flowrate?
A: The rectifying section flowrate depends on the reflux ratio and distillate flowrate in the column.

Q3: What are typical values for feed quality?
A: For saturated liquid q=1, for saturated vapor q=0, and for mixed phase 0 < q < 1.

Q4: Why is this calculation important?
A: It helps determine the internal liquid flowrates which affect separation efficiency and energy requirements.

Q5: Can this be used for non-ideal systems?
A: The basic formula works for ideal systems; non-ideal systems may require additional corrections.