ABSTRACT
This chapter discusses various ways the acid gases, particularly H2S, generated in treating must be disposed of in an environmentally acceptable way. Two methods are used to dispose of large quantities of H2S. The most common process is to convert the H2S to elemental sulfur using the Claus process. The chapter discusses the Claus process and the alternatives needed based upon the concentration of H2S in the feed. However, the process of gas still contains too much H2S so tail gas cleanup units are required. The chapter describes three most commonly used tail gas cleanup processes. The second method of H2S disposal is acid gas injection (AGI) where the gas is injected into suitable underground formations, which is discussed in the chapter. The chapter also covers three processes economically feasible for smaller quantities of H2S.
