Space Time Formula:
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Definition: Space time (τ) is the time required to process one reactor volume of feed at specified conditions.
Purpose: It helps chemical engineers determine the residence time needed for a given conversion in a continuous stirred-tank reactor (CSTR).
The calculator uses the formula:
Where:
Explanation: The formula calculates the time needed to achieve the specified conversion based on the reaction kinetics.
Details: Proper space time calculation ensures optimal reactor design, efficient conversion rates, and cost-effective chemical processes.
Tips: Enter the initial concentration, conversions (as decimals between 0-1), and reaction rate. Ensure Xi-1 ≥ Xi.
Q1: What units should I use for concentration and reaction rate?
A: Use consistent units (mol/m³ for concentration and mol/m³·s for reaction rate) for accurate results.
Q2: How do I determine the reaction rate?
A: Reaction rate can be determined experimentally or from kinetic studies of the specific reaction.
Q3: What if my conversion decreases between vessels?
A: This calculator assumes Xi-1 ≥ Xi. If conversion decreases, check your system for errors.
Q4: Can this be used for batch reactors?
A: No, this formula is specifically for continuous flow reactors (CSTRs).
Q5: How does temperature affect the calculation?
A: Temperature effects are captured in the reaction rate value (ri), which should be determined at the operating temperature.