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The article contains sections titled: 1. Introduction 2. Olefin Production by Steam Cracking 2.1. Background 2.2. Chemistry of Olefin Production 2.3. The Reactor 2.4. Reactor Design 2.5. Heat Recovery 2.6. Control of the Reactor 2.7. Coking 2.8. Alternatives to the Tubular Reactor 3. Gas‐Phase Chlorocarbon Cracking Reactions 3.1. Reaction Description 3.2. Reaction Thermodynamics 3.3. Reaction Mechanism 3.4. Reactor Design and Operating Conditions 3.5. Reactor Modeling 3.6. Reactor Coking and Carbon Formation 4. Gas‐Phase Halogenation Processes 4.1. Reaction Description 4.2. Substitutive Chlorination Reactors 4.2.1. Reactor Modeling 4.2.2. Reactor Coking and Soot Formation 4.3. Substitutive Bromination Reactors 4.3.1. Reactor Design 4.3.2. Reactor Modeling 4.3.3. Reactor Coking and Carbon Formation 4.4. Perhalogenation Reactors 4.4.1. Reaction Description 4.4.2. Reactor Design and Operation 4.4.3. Reactor Modeling 4.4.4. Reactor Coking and Carbon Formation 5. Fundamental Modeling Approaches — An Evaluation 5.1. Thermal Decomposition of Ethane 5.2. Improving the Model 6. Conclusions