Reaction Rate Formula:
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Definition: This equation calculates the reaction rate of reactant A in gas-liquid reactions considering mass transfer resistances in gas film, liquid film, and catalyst surface, along with the intrinsic reaction rate.
Purpose: It helps chemical engineers design and analyze gas-liquid-solid catalytic reactors by accounting for all mass transfer limitations and the actual reaction rate.
The calculator uses the formula:
Where:
Explanation: The formula accounts for resistances in series: gas film, liquid film, catalyst surface film, and the actual reaction rate.
Details: Accurate reaction rate estimation is crucial for reactor design, process optimization, and scaling up chemical processes from lab to industrial scale.
Tips: Enter all required parameters with appropriate units. Default values are provided for reference but should be replaced with actual experimental or literature values for your specific system.
Q1: What if I don't know some of these parameters?
A: You may need to perform separate experiments or consult literature to estimate missing parameters. Some can be calculated from correlations.
Q2: How do I determine the effectiveness factor?
A: The effectiveness factor can be estimated from Thiele modulus calculations or measured experimentally.
Q3: What's a typical range for Henry's law constant?
A: It varies widely depending on the gas and liquid. For common gases in water at 25°C, it ranges from 1.3×10⁻⁵ (H₂) to 3.3×10⁻⁴ (CO₂) mol/(m³·Pa).
Q4: How does temperature affect this calculation?
A: Temperature affects all rate constants and mass transfer coefficients. Use values appropriate for your operating temperature.
Q5: Can this be used for non-catalytic G/L reactions?
A: For non-catalytic reactions, omit the catalyst-related terms (kAc and effectiveness factor).