Space Time Formula:
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Definition: Space time is the time required to process one reactor volume of feed under specified conditions for a zero-order reaction in a mixed flow reactor.
Purpose: It helps chemical engineers determine the necessary residence time for reactants to achieve a desired conversion in a continuously stirred tank reactor (CSTR).
The calculator uses the formula:
Where:
Explanation: For zero-order reactions, the space time is directly proportional to the desired conversion and initial concentration, and inversely proportional to the rate constant.
Details: Accurate space time calculation ensures proper reactor sizing, optimal reaction conditions, and efficient process design in chemical engineering applications.
Tips: Enter the reactant conversion (0-1), initial concentration (mol/m³), and rate constant (mol/(m³·s)). All values must be positive, with conversion between 0 and 1.
Q1: What is a zero-order reaction?
A: A reaction where the rate is independent of the reactant concentration, proceeding at a constant rate.
Q2: What's a typical range for space time in industrial reactors?
A: It varies widely from seconds to hours depending on the reaction kinetics and desired conversion.
Q3: How does mixed flow differ from plug flow?
A: Mixed flow (CSTR) assumes perfect mixing with uniform composition, while plug flow has no mixing with concentration gradients along the reactor.
Q4: Can this calculator be used for other reaction orders?
A: No, this is specific to zero-order reactions. Different equations apply for first-order or second-order reactions.
Q5: What if my rate constant has different units?
A: Convert your rate constant to mol/(m³·s) before using this calculator for accurate results.