Formula Used:
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Definition: This calculator determines the initial concentration of reactant needed for a two-step first-order reaction in a mixed flow reactor.
Purpose: It helps chemical engineers design reactors and predict reactant requirements for consecutive first-order reactions.
The calculator uses the formula:
Where:
Explanation: The formula accounts for both the reaction kinetics and the reactor's residence time characteristics.
Details: Accurate calculation ensures proper reactor design, optimal reaction conditions, and efficient use of reactants.
Tips: Enter the reactant concentration (default 13.3 mol/m³), rate constant (default 0.42 1/s), and space time (default 12 s). All values must be > 0.
Q1: What is space time in a mixed flow reactor?
A: Space time (τ) is the time required to process one reactor volume of feed under specified conditions.
Q2: How do I determine the rate constant for my reaction?
A: Rate constants are typically determined experimentally through kinetic studies of the reaction.
Q3: Can this calculator be used for other reactor types?
A: No, this formula is specific to mixed flow (CSTR) reactors. Plug flow reactors would use a different equation.
Q4: What if I have more than two reaction steps?
A: This calculator is for two-step reactions only. More complex reactions require different modeling approaches.
Q5: How does temperature affect this calculation?
A: Temperature primarily affects the rate constant (k). Use the appropriate k value for your operating temperature.