This book covers petroleum refining and gas purification processes, including refinery configurations comprising of relevant units with special emphasis on processing of heavy crudes with high acid number. It includes a short review of distillation principles, distillation column auxiliaries, critical column pressure control strategies, critical issues of crude and vacuum distillation units particularly for heavy crude processing. Different corrosion mechanisms and their prevention with regards to heavy high TAN crude processing are also included. Fundamentals are explained with support of steady-state simulation and presented with simulation flowsheets and outputs, supported by examples of calculations and troubleshooting case studies. Features: • Deals with principles and practices in the hydrocarbon industry and petroleum refinery with emphasis on heavy crude processing • Focuses on operation and practices of the major process units with simulation examples and aimed at the professional engineer • Covers acid gas treatment in view of increased emphasis on carbon capture and storage, and introduction of residue gasification processes • Elucidates methodologies for safety relief load computation for distillation columns • Explains real-life problems in reboilers, column internals, column pressure controls and corrosion in crude, and vacuum distillation and secondary units with several case studies This book is aimed at professionals in petroleum engineering and graduate students in chemical engineering.