This is the only book to apply thermodynamics to real-world process engineering problems, explaining the thermodynamics behind simulations from the view of academic and industrial authors 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 for formaldehyde, polymers, and associating compounds. Estimation methods for thermophysical properties and phase equilibria and thermodynamics of alternative separation processes are covered, as are new developments from recent years. For a deeper understanding additional problems are given at the end of each chapter. To solve the complex problems prepared Mathcad files, Excel files or the DDBSP Explorer version can be accessed via the Internet. 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.