This book explores effective modeling and simulation approaches for solving equations. This book explains the simplification of a complicated process at various levels with the help of a "model sketch." The second edition covers modeling of multi-stage processes, multi-stage, multi-phase systems with thermodynamic processes including reactive distillation. Further, process intensification is added with modeling of electrochemical processes. A chapter on batch processes in filtration, adsorption and batch reactors is included backed by case studies. Presents a systematic approach of model development in view of the simulation need Discusses modeling techniques to model hydrodynamics, mass and heat transfer, and reactors for single as well as multi-phase/multi-phase system Explores diffusion based on Stefan-Maxwell theory including principal component analysis Reviews dynamics models covering process dynamics Includes enhanced case studies to illustrate simulations including ANN and DWSIM This book is aimed at senior undergraduate and graduate students in chemical, biochemical and environmental engineering.