This book thoroughly analyzes the crucial role of supersonic separator technology in addressing the challenges of environmental degradation and climate change, particularly highlighting its importance in the dehydration and decarbonization of natural gas. Employing computational fluid dynamics (CFD) modeling and experimental research, along with meticulous data processing and image presentation, the authors extensively investigate the complex phenomena of flow field characteristics and heat and mass transfer mechanisms within supersonic separators. This approach demonstrates the innovative potential of this technology in the field of gas purification. The book also introduces new strategies to enhance separation efficiency through heterogeneous condensation enhancement and multi-objective optimization techniques, providing readers with a deep understanding of the latest research in gas purification. Furthermore, it stimulates in-depth discussions about building efficient energy systems and addressing climate challenges. This book not only presents the latest advancements in supersonic separation technology but also guides readers to consider how to establish an efficient, environmentally friendly, and stable energy system to effectively tackle the challenges of global climate change.