1. What is Reaction Rate based on Surface Area?

Definition: This calculator determines the reaction rate based on surface area when considering straight mass transfer for liquid film.

Purpose: It helps chemical engineers and researchers calculate the rate of reactant consumption or product formation in liquid-phase reactions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( r''_A \) — Reaction rate based on surface area (mol/m³·s)
• \( k_{Al} \) — Liquid phase mass transfer coefficient (m/s)
• \( C_{Ai} \) — Concentration of reactant A at interphase (mol/m³)
• \( C_A \) — Bulk reactant concentration (mol/m³)

Explanation: The rate is proportional to the mass transfer coefficient and the concentration gradient between the interface and bulk liquid.

3. Importance of Reaction Rate Calculation

Details: Accurate reaction rate determination is crucial for reactor design, process optimization, and scaling up chemical processes.

4. Using the Calculator

Tips: Enter the liquid phase mass transfer coefficient (default 0.33 m/s), concentration at interphase (default 31.2 mol/m³), and bulk reactant concentration (default 24.1 mol/m³).

5. Frequently Asked Questions (FAQ)

Q1: What is the physical meaning of k_Al?
A: The liquid phase mass transfer coefficient represents how quickly a component can move from the interface into the bulk liquid.

Q2: How do I determine C_Ai?
A: This is typically determined from equilibrium data or Henry's law for gas-liquid systems.

Q3: What factors affect k_Al?
A: It depends on fluid properties, turbulence, temperature, and the specific geometry of the contactor.

Q4: Can this be used for gas-phase reactions?
A: No, this formula specifically applies to liquid film mass transfer. Gas-phase would use different correlations.

Q5: What if my reaction is fast compared to mass transfer?
A: In such cases, the reaction may occur in a thin layer near the interface, requiring different modeling approaches.