This textbook is designed for courses in mass transfer operations, a staple in any chemical engineering curriculum. The second edition is updated to discuss many developing topics in mass transfer operations not discussed in the first, including membrane separations, chromatography and other adsorptive processes, ion exchange, electrophoresis, and multistage batch distillation, differential transport equations, and boundary-layers. This new edition will also incorporate mass transfer phenomena in biological systems, making it applicable in biochemical engineering as well as chemical engineering.