This book explains recent advances in the field of hydroprocessing and discusses in details all important aspects of hydroprocessing – including catalytic materials, reaction mechanism, as well as process design, operation and control, troubleshooting and optimization. It provides practical methods and tools to industrial practitioners with the focus on improving industrial energy efficiency, reducing capital investment and optimizing yields via better design, operation and optimization. These methods and tools have been proven from industrial applications in the recent years. The content of the book is based on the knowledge and experience the authors gained over many years in research, engineering, consulting and service support for hydroprocessing processes