1. What is Fresh Molar Feed Rate?

Definition: Fresh Molar Feed Rate gives the number of moles of fresh reactant being fed to the reactor per unit time.

Purpose: It helps chemical engineers determine the amount of fresh reactant needed in a reactor system with recycle streams.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The total feed rate is divided by (recycle ratio + 1) to determine the fresh feed component.

3. Importance of Fresh Feed Calculation

Details: Accurate calculation ensures proper reactant stoichiometry, optimal reactor operation, and efficient use of resources in chemical processes.

4. Using the Calculator

Tips: Enter the total molar feed rate in mol/s and the recycle ratio (dimensionless). Total feed rate must be > 0 and recycle ratio ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the recycle ratio?
A: The recycle ratio is defined as the volume of feed returned to the reactor entrance divided by the volume of the leaving streams.

Q2: Why do we need to calculate fresh feed separately?
A: In systems with recycle streams, the fresh feed must be calculated separately to maintain proper material balance and reaction stoichiometry.

Q3: What units should be used for the inputs?
A: Total molar feed rate should be in moles per second (mol/s), while recycle ratio is dimensionless.

Q4: Can the recycle ratio be zero?
A: Yes, a recycle ratio of zero means there's no recycle stream, making fresh feed equal to total feed.

Q5: How does this relate to overall reactor design?
A: Fresh feed calculation is crucial for determining reactor size, residence time, and overall process efficiency.