Question:
In an ideal Continuous Stirred Tank Reactor (CSTR) at steady state
In an ideal Continuous Stirred Tank Reactor (CSTR) at steady state
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CSTR = Perfect Mixing = Uniformity at Steady State.
Updated On: May 14, 2026
- All particles have equal residence time.
- Maximum number of particles have residence time equal to average residence time.
- Maximum number of particles have residence time close to zero.
- Maximum number of particles have residence time close to infinity.
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The Correct Option is B
Solution and Explanation
Step 1: Concept
A CSTR assumes perfect mixing, meaning the composition and properties are uniform throughout the vessel.
Step 2: Meaning
Residence time distribution (RTD) describes how much time different elements of fluid spend inside the reactor.
Step 3: Analysis
In an ideal CSTR, the probability of a particle leaving is independent of how long it has been inside. Mathematically, the exit age distribution follows an exponential decay.
Step 4: Conclusion
At steady state, the concentration and distribution are balanced such that the peak of the distribution corresponds to the mean residence time. Final Answer: (B)
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