1. What is Gas Flowrate for Absorption Column?

Definition: This calculator determines the solute-free gas flow rate needed in an absorption column based on liquid flow rate and mole fractions.

Purpose: It helps chemical engineers design and analyze absorption columns for gas purification processes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( G_s \) — Gas flowrate on solute free basis (mol/s)
• \( L_s \) — Liquid flowrate on solute free basis (mol/s)
• \( Y_{N+1} \) — Solute free mole fraction of gas in inlet
• \( Y_1 \) — Solute free mole fraction of gas in outlet
• \( X_N \) — Solute free mole fraction of liquid in outlet
• \( X_0 \) — Solute free mole fraction of liquid in inlet

Explanation: The formula balances the solute transfer between gas and liquid phases in an absorption column.

3. Importance of Gas Flowrate Calculation

Details: Proper flowrate calculation ensures efficient mass transfer, optimal column sizing, and meets purification requirements.

4. Using the Calculator

Tips: Enter all required mole fractions (values between 0 and 1) and liquid flowrate. Default values represent typical absorption scenarios.

5. Frequently Asked Questions (FAQ)

Q1: What is solute-free basis?
A: It means the calculations exclude the solute component, focusing only on the carrier gas and solvent.

Q2: When would I need this calculation?
A: When designing absorption columns for gas purification, acid gas removal, or similar processes.

Q3: What are typical values for mole fractions?
A: Inlet gas (Y_N+1) is typically highest (0.1-0.9), outlet gas (Y₁) lowest (0.01-0.1), with liquid fractions depending on solvent.

Q4: How does liquid flowrate affect the calculation?
A: Higher liquid flowrates generally allow for higher gas flowrates while maintaining the same purification efficiency.

Q5: What if my outlet liquid mole fraction is zero?
A: X_N should never be zero in practical applications as some solute will always be present in the liquid.