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This book introduces the fundamental principles of the mass transfer phenomenon and its diverse applications in process industry. It covers the full spectrum of techniques for chemical separations and extraction. Beginning with molecular diffusion in gases, liquids and solids within a single phase, the mechanism of inter-phase mass transfer is explained with the help of several theories. The separation operations are explained comprehensively in two distinct ways—stage-wise contact and continuous differential contact. The primary design requirements of gas–liquid equipment are discussed. The book provides a detailed discussion on all individual gas–liquid, liquid–liquid, solid–gas, and solid–liquid separation processes. The students are also exposed to the underlying principles of the membrane-based separation processes. The book is replete with real applications of separation processes and equipment. Problems are worked out in each chapter. Besides, problems with answers, short questions, multiple choice questions with answers are given at the end of each chapter. The text is intended for a course on mass transfer, transport and separation processes prescribed for the undergraduate and postgraduate students of chemical engineering. Table of Contents Preface 1. Introduction 2. Diffusion 3. Mass Transfer Coefficients And Analogy Equations 4. Interphase Mass Transfer 5. Methods Of Operation And Computation 6. Equipment For Gas–Liquid Contact 7. Gas Absorption 8. Distillation 9. Humidification Operations 10. Liquid–Liquid Extraction 11. Leaching 12. Drying 13. Crystallization 14. Adsorption And Chromatography 15. Membrane Separation Index