A post-combustion process used to remove acid gases such as carbon dioxide, hydrogen sulphide, and mercaptans from natural gas using an amine chemical solvent to react and form reversible compounds. Carbon dioxide is required to be removed since it reduces the calorific value of natural gas and forms carbonic acid in water which is corrosive as well as having a global warming potential. The process involves the reversible reaction of the gas with an amine to form an amine salt. Various amines are used including monoethanolamine. The amine solution is sprayed into a large tower and absorbs the hydrogen sulphide as well as carbon dioxide from upflowing gases. A regenerator operating at a higher temperature is used to strip the amine solution of the gases for reuse. See gas sweetening.