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Rate Equation of Reactant A at Extreme B Calculator

Reaction Rate Formula:

\[ rA''' = -\frac{1}{\left(\frac{1}{k_{Ag}a_i} + \frac{H_A}{k_{Al}a_i} + \frac{H_A}{k_{Ac}a_c} + \frac{H_A}{k_A'''C_{Bl,d}\xi_A f_s}\right)} p_{Ag} \]

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1. What is the Rate Equation of Reactant A at Extreme B?

Definition: This equation calculates the reaction rate of reactant A in a gas-liquid-solid catalytic system where reactant B is in excess (extreme B conditions).

Purpose: It helps chemical engineers determine the reaction rate in multiphase catalytic systems, accounting for mass transfer resistances in all phases.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ rA''' = -\frac{1}{\left(\frac{1}{k_{Ag}a_i} + \frac{H_A}{k_{Al}a_i} + \frac{H_A}{k_{Ac}a_c} + \frac{H_A}{k_A'''C_{Bl,d}\xi_A f_s}\right)} p_{Ag} \]

Where:

Explanation: The formula accounts for resistances in gas film, liquid film, catalyst film, and reaction kinetics.

3. Importance of Reaction Rate Calculation

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

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Default values are provided for reference but should be adjusted based on your specific system.

5. Frequently Asked Questions (FAQ)

Q1: What does "extreme B" mean in this context?
A: It means reactant B is present in such excess that its concentration remains essentially constant during the reaction.

Q2: How do I determine the Henry's Law constant for my system?
A: The Henry's Law constant can be found in chemical engineering handbooks or determined experimentally for your specific gas-liquid system.

Q3: What's the difference between inner and external area of particle?
A: Inner area refers to the surface within pores, while external area is the outer surface of the catalyst particle.

Q4: How does solid loading affect the reaction rate?
A: Higher solid loading (more catalyst) typically increases reaction rate, but too much can cause mass transfer limitations.

Q5: What if my system doesn't have all these resistances?
A: For simpler systems, set the corresponding terms to very large numbers (effectively eliminating their resistance).

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