Explain what is done with the acid gas that is separated from the feed gas?

The acid gas, primarily hydrogen sulfide (H2S) and carbon dioxide (CO2), that is separated from the feed gas is typically processed in one of several ways to prevent its release into the atmosphere and to potentially recover valuable resources. One common method is to send the acid gas to a sulfur recovery unit (SRU), typically a Claus process unit. In the Claus process, H2S is converted into elemental sulfur through a series of chemical reactions. The sulfur can then be sold as a commodity or used in other industrial processes. Another option is CO2 sequestration. The CO2 can be compressed and transported to a suitable geological formation for long-term storage. This helps to reduce greenhouse gas emissions. In some cases, the acid gas can be injected into depleted oil or gas reservoirs to enhance oil or gas recovery. This is known as enhanced oil recovery (EOR) or enhanced gas recovery (EGR). If the acid gas is relatively dilute and contains only small amounts of H2S, it can be flared. However, flaring is generally discouraged due to environmental concerns and is typically only used as a last resort. The specific method used for processing the acid gas depends on factors such as the composition and concentration of the acid gas, the local environmental regulations, and the economic feasibility of the various options. The choice of processing method must comply with stringent environmental regulations to minimize air pollution and greenhouse gas emissions.