The objective of The Sour Gas, Sulfur and Acid Gas Book is to describe the historical development and current applications of the procedures and processes used in the sour natural gas industry to safely produce, gather and treat sour gas, recover sulfur and dispose of waste products in an environmentally friendly manner. Along with the evolution of the sour gas technology there has been the development and evolution of the personal computer together with powerful software to simulate and refine any operation in sour gas and any other aspect in the hydrocarbon industry. It is now possible for a design engineer to enter any technical term or phrase into a search engine on the internet and extract detailed information on the topic. So why does one need a book? The intention of this book is to provide a historical perspective and a basic description of the various processes and procedures to get the sour gas safely out of the formation to surface, send it through a network of gathering lines to the central treating plant, separate the acid gas components and then describe the processes for handling the acid gas. With the use of computer simulation software it is possible to elaborate on any aspects of the path of the sour gas from reservoir to the ultimate disposal of the various components in the sour gas. Reference is frequently made to key articles published over the years in trade journals and technical publications, as well as papers presented at various conferences, which provide details on the many topics covered in this book.