Formula Used:
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Definition: The rate constant for a first-order reaction is defined as the rate of the reaction divided by the concentration of the reactant.
Purpose: This calculator determines the rate constant for first-order reactions in mixed flow reactors based on reactant concentrations.
The calculator uses the formula:
Where:
Explanation: The formula calculates how quickly the reactant is being consumed in a mixed flow reactor.
Details: Knowing the rate constant helps in reactor design, process optimization, and predicting reaction behavior under different conditions.
Tips: Enter the space time in seconds, initial reactant concentration, and current reactant concentration. All values must be > 0.
Q1: What is space time in mixed flow?
A: Space time is the time necessary to process volume of reactor fluid at the entrance conditions.
Q2: What units should I use for concentrations?
A: The calculator uses mol/m³, but any consistent concentration units will work as long as C₀ and C use the same units.
Q3: What does a higher rate constant indicate?
A: A higher rate constant means the reaction proceeds faster at a given reactant concentration.
Q4: Can this be used for second-order reactions?
A: No, this calculator is specifically for first-order reactions. Different equations apply for other reaction orders.
Q5: How does temperature affect the rate constant?
A: Rate constants typically increase with temperature according to the Arrhenius equation, but this calculator doesn't account for temperature effects.