In this book Sweetening of natural gas is discussed with the help of literature survey and calculations. Different processes, commonly used in industries are compared. Different methods for calculation water contents in Natural Gas are also given in this book. A brief method for designing absorber with stage to stage calculation is also given. Optimization for sweetening process is discussed in detail. Process designers and Chemical engineers will find this book a valuable guide to gas sweetening, both in terms of its application to efficient and cost effective operations. It will prove particularly useful to readers who want a "quick reference" guide to natural gas sweetening operations and procedures as well as those readers who wish to increase their knowledge of best practices.