Reactor Residence-Time Distribution Lab: Understanding Reaction Kinetics Through Flow Dynamics

What is Residence-Time Distribution

Residence-time distribution (RTD) describes how long individual molecules or particles spend within a reactor. It's crucial for understanding reaction efficiency and product quality.

The RTD can be visualized as the time it takes for material to move through a reactor, from entry to exit.

Types of Reactors

Continuous stirred-tank reactors (CSTR) are ideal mixers where all fluid is well-mixed and behaves like an instantaneous batch. Their RTD follows an exponential distribution.

Plug flow reactors (PFR) assume perfect mixing in the axial direction but no lateral mixing, leading to a uniform residence time along the reactor length.

N-Tanks-in-Series Model

The N-tanks-in-series model is an intermediate between CSTR and PFR. It consists of multiple tanks connected in series with each tank having its own residence time.

This model can simulate a range of behaviors, from nearly perfect mixing to complete plug flow.

Implications for Chemical Kinetics

The RTD affects the reaction rate and product distribution. In CSTRs, the mean residence time is constant, while in PFRs, it varies along the reactor length.

Understanding RTD helps optimize reactor design to achieve desired conversion rates and product yields.

Frequently asked questions

Try it live

Everything above runs in your browser — open Reactor Residence-Time Distribution Lab (2D) and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.