The Seader and Henley textbook is similar in its approach to that used to teach chemical reaction engineering, which typically covers reactor design based on material balances, energy balances, fluid mechanics, heat transfer, mass transfer, physical and chemical equilibrium, and reaction kinetics. Seader and Henley stress the viewpoint of unifying the rate-based approach and the equilibrium-based approach in a course that systematically proceeds through the separation operations after initial chapters on the fundamentals of diffusion and mass transfer (Ch.3) and on physical equilibrium (Ch. 2). This text is a major expansion of the successful 1981 Henley/Seader text, Equilibrium Stage Separation Operations in Chemical Engineering.