Green Process Technology implies a reduced environmental footprint of the production of food, water, and other materials. In the course, the process efficiency is treated for examples in drinking water preparation, and other aqueous separations by calculating the minimum thermodynamic work required for separation, the lost work, and the generation of entropy by (coupled) irreversible processes. The course material further includes i) basic statistical mechanical calculations on entropy driven processes such as osmosis, ii) electrochemical driving forces for (bio-)chemical reactions and transport over a cell membrane, iii) examples of industrial separation technologies, iv) industrial crystallisation, v) Natural Deep Eutectic Solvents (NADES) and ionic liquids, vi) processes using supercritical carbon dioxide as solvent, vii) Mollier diagrams for air humidity calculations, viii) a global exergy (useful energy) dissipation diagram for both renewable and fossil sources.