This is the only book to apply thermodynamics to real-world process engineering problems, explaining the thermodynamics behind simulations to users of simulation programs. It comprises numerous solved examples, which simplify the understanding of the often complex calculation procedures, and discusses their advantages and disadvantages. The text also includes such special models as formaldehyde, polymers, and association. Estimation methods for thermophysical properties and phase equilibria, thermodynamics of alternative separation processes are covered, as are new developments from recent years. Recipes for the procedure are given at the end of each chapter, and further small programs are available via the Internet, such as mod. UNIFAC, MathCad and Excel files. While written for an advanced level, the text is easy to understand for every chemical engineer and chemist with a basic education in thermodynamics and phase equilibria, teaching students the engineering perspective of thermodynamics but also of interest to all companies active in chemistry, pharmacy, oil and gas processing, petrochemistry, refinery, food production, environmental protection and engineering.