Chemical Engineering
Reaction Engineering
This guide helps you get your bearings in Reaction Engineering before you start exploring the interactive timeline, framework graph, and concept maps.
Before You Dive In
- Chemical reaction engineering connects chemistry to industrial reality — it answers "how do we make this reaction happen at scale, efficiently and safely?".
- The central framework is reactor design: choosing among batch, continuous stirred-tank (CSTR), and plug-flow (PFR) reactors based on reaction kinetics and economics.
- Start with the mole balance and rate law — every reactor design problem begins with these two equations combined with energy and momentum balances.
- Residence time distribution (RTD) is the key diagnostic: it tells you how long molecules actually spend in a reactor and reveals deviations from ideal flow patterns.
- The interplay between reaction kinetics and transport phenomena (heat and mass transfer) is what makes real reactor design complex — reactions in the lab don't automatically scale up.
Key Terms to Know
Rate lawMathematical expression relating reaction rate to concentrations and temperature, typically via Arrhenius-type parameters.
CSTRContinuously stirred tank reactor: assumes perfect mixing so the outlet composition equals the composition everywhere inside.
Plug flow reactorTubular reactor where fluid moves as a "plug" with no axial mixing; concentration changes along the reactor length.
Residence time distributionProbability distribution of how long different fluid elements spend inside a reactor; characterizes mixing behavior.
SelectivityThe fraction of converted reactant that forms the desired product versus byproducts; often more important than conversion.
Activation energyMinimum energy barrier that reactant molecules must overcome; determines how strongly temperature affects reaction rate.
Common Confusions
Assuming a faster reaction is always better — high rates can cause runaway temperatures, poor selectivity, or safety hazards at scale.
Treating CSTR and PFR as real reactors rather than ideal models — actual reactors fall between these extremes, and the RTD quantifies where.
Confusing thermodynamic feasibility with kinetic feasibility — a reaction can be thermodynamically favorable but practically too slow without a catalyst.
Recommended Reading
Elements of Chemical Reaction Engineering— H. Scott Fogler
1986Chemical Reaction Engineering— Octave Levenspiel
1962Chemical Engineering Kinetics— J.M. Smith
1981How to Use the Interactive View
1
Explore the timeline
Open the interactive view and scan the framework timeline. Which frameworks came first? Which ones overlap? Where are the big transitions?
2
Read the articles
Click into individual frameworks to read what each one claims, where it came from, and how it relates to its neighbors.
3
Check the concept map
See how the key ideas within a framework connect. This is useful for figuring out what to learn first and what depends on what.
4
Test yourself
Take the quiz for any framework you've read about. It's a quick way to find out whether you actually understood the core ideas or just skimmed them.