The most common technology used for acid gas removal is chemical absorption, which is based on reversible exothermic reaction of a suitable solvent with the gas stream to remove CO2and H2S present. Unlike physical absorbents, water content in chemical absorbents minimizes heavy hydrocarbon absorption, making it more suitable for feed gas containing heavy (C4+) hydrocarbons. There are generally two categories of absorbents: potassium carbonate and amine based absorbents (e.g.,mono-ethanolamine (MEA), diethanolamine (DEA) and methyl-di-ethanolamine (MDEA)). Potassium carbonate causes stress corrosion to the units, and also reacts with some corrosion inhibitors and causes erosion to the units. All these lead to higher capital investment than that for amine based absorbents. Hence,amine absorption process is the most commonly used acid gas removal technology. In this process, sour gas enters the absorption tower at the bottom, whilst lean amine from the stripper comes into the tower near the top. Sweet gas (with sour components meeting the pipeline specifications) leaves the absorption tower at the top,and saturated amine is sent to the stripper for regeneration.