This book is written with second year chemical engineering undergraduate students in mind. Chemical engineering undergraduate students are generally taught Equilibrium Stage Operations in their second year. This is the first time they are introduced to equilibrium stage based separation processes. Their background at this stage is quite limited. The goal is to present the equilibrium stage concepts and operations in a manner comprehensible to second year chemical engineering students with little or no prior exposure to separation processes.The book consists of sixteen chapters. It covers single-stage and multi-stage absorption and stripping, flash distillation, multi-stage column distillation, batch distillation with and without reflux, liquid-liquid extrac- tion, and solid-liquid leaching. Although the book is focussed on equilibrium staged separation processes, the final chapter (chapter 16) is devoted to the analysis and design of continuous contacting packed col- umns as packed columns are becoming increasingly important in practical applications.For more details, please visit https: //centralwestpublishing.com