Advances in Natural Gas: Formation, Processing, and Applications. Volume 2: Natural Gas Sweetening comprises an extensive eight-volume series delving into the intricate realms of both the theoretical fundamentals and practical methodologies associated with the various facets of natural gas. Encompassing the entire spectrum from exploration and extraction to synthesis, processing, purification, and the generation of valuable chemicals and energy, these volumes also navigate through the complexities of transportation, storage challenges, hydrate formation, extraction, and prevention. In Volume 2 titled Natural Gas Sweetening, we delve into the intricacies of various natural gas sweetening methods. This book meticulously explores absorption techniques, employing a range of solvents like physical solvents, amine blends, encapsulated liquids, and more--a crucial aspect of the sweetening process. Additionally, it provides an insightful examination of natural gas sweetening through adsorption-based technologies, utilizing diverse materials such as zeolites, metal oxides, and silica-based sorbents. The volume further delves into membrane-based processes, featuring various types like ionic liquid and polymeric systems.