1. What is Recycle Ratio?

Definition: Recycle Ratio is defined as volume of feed returned to the reactor entrance divided by the volume of the leaving streams.

Purpose: It helps chemical engineers determine the efficiency of reactant utilization in processes with recycle streams.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Recycle Ratio (dimensionless)
• \( F_0' \) — Total Molar Feed Rate (mol/s)
• \( F \) — Fresh Molar Feed Rate (mol/s)

Explanation: The ratio compares the total feed (fresh + recycled) to just the fresh feed, then subtracts 1 to isolate the recycled portion.

3. Importance of Recycle Ratio

Details: Proper calculation ensures optimal reactor design, efficient reactant utilization, and cost-effective process operation.

4. Using the Calculator

Tips: Enter the total molar feed rate and fresh molar feed rate in mol/s. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does a recycle ratio of 1 mean?
A: A ratio of 1 means the recycled stream is equal to the fresh feed stream.

Q2: Can the recycle ratio be less than 0?
A: No, since total feed must be greater than or equal to fresh feed.

Q3: What's a typical recycle ratio in industry?
A: It varies by process but often ranges from 0.5 to 10 depending on conversion efficiency needs.

Q4: How does recycle ratio affect reactor design?
A: Higher ratios allow smaller reactors but increase pumping/energy costs.

Q5: Does this include purge streams?
A: No, this simple calculation assumes all unreacted material is recycled.