This specialised textbook and reference work examines mass transfer from a unified perspective suitable for a wide range of processes in chemical engineering. The authors discuss, amongst other things, driving forces, friction, concentration gradients, chemical potential and mass transfer coefficients, and elaborate on these concepts for systems containing different components. The book covers both gas and liquid phases, as well as membrane processes, adsorption, ion exchange, dialysis, ultrafiltration and other separation techniques. An important theoretical starting point is the Maxwell-Stefan approach, which allows the interactions between different components in a mixture to be described more accurately than with an approach based solely on Fick?s law. The book combines theoretical explanations with examples and practical applications, making it particularly of interest to students, researchers and engineers in chemical engineering, process engineering and related disciplines. (AI-generated content description)