“…In general, natural gas contains methane (75–90%), propane, butane, ethane, heavy hydrocarbons (1–3%), and also impurities such as water vapor, carbon dioxide (CO 2 ), hydrogen sulfide (H 2 S), mercaptans (RSH), carbonyl sulfide (COS), carbon disulfide (CS 2 ), and nitrogen [ 4 , 5 , 6 ]. Some of these impurities are toxic, corrosive, and cause environmental pollution after combustion so their removal from natural gas is extremely important [ 7 , 8 ]. One of the techniques for treating the natural gas stream is to use an aqueous alkanolamine such as methyl-diethanolamine (MDEA) which is prevalent in the removal of up to 30% of impurities from the gas stream [ 8 , 9 , 10 , 11 ].…”