text: Aqueous monoethanolamine (MEA), diglycolamine (DGA), diethanolamine (DEA), diisopropanolamine (DIPA) and methyldiethanolamine (MDEA) are widely used industrially for removing carbon dioxide (CO) and hydrogen sulfide (HS) from natural gas and refinery process streams. They may also be used to remove CO from combustion gases and flue gases and may have potential for abatement of greenhouse gases. Related processes are known as sweetening.