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Rate Equation of Reactant A for Straight Mass Transfer for Gas Film using Surface Area of Contactor Calculator

Reaction Rate Formula:

\[ r''_A = k_{Ag} \times (p_A - p_{Ai}) \]

m/s
Pa
Pa
mol/(m³·s)

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1. What is the Rate Equation for Straight Mass Transfer?

Definition: This calculator determines the reaction rate based on surface area for gas film mass transfer using the partial pressure difference.

Purpose: It helps chemical engineers calculate the mass transfer rate in gas-liquid systems when considering the surface area of the contactor.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ r''_A = k_{Ag} \times (p_A - p_{Ai}) \]

Where:

Explanation: The reaction rate is proportional to the mass transfer coefficient and the driving force (partial pressure difference).

3. Importance of Reaction Rate Calculation

Details: Accurate reaction rate calculation is crucial for designing chemical reactors, predicting reaction outcomes, and optimizing process conditions.

4. Using the Calculator

Tips: Enter the gas phase mass transfer coefficient, partial pressures of reactant A in bulk and at interface. All values must be positive, with pA ≥ pAi.

5. Frequently Asked Questions (FAQ)

Q1: What is the physical meaning of kAg?
A: The gas phase mass transfer coefficient represents how easily a component moves from the gas bulk to the gas-liquid interface.

Q2: How is pAi determined experimentally?
A: It's typically determined at equilibrium conditions or measured using specialized interfacial sensors.

Q3: What factors affect kAg?
A: Temperature, pressure, gas velocity, system geometry, and physical properties of the gas all influence kAg.

Q4: When would pA equal pAi?
A: At equilibrium conditions, when there's no driving force for mass transfer.

Q5: Can this equation be used for liquid films?
A: No, this specific equation is for gas films. Liquid films would use concentrations rather than partial pressures.

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