ANS:A - mono-ethanolamine (MEA)

Carbon dioxide (CO2) present in reformed gas obtained by steam reforming of naphtha is typically removed by absorbing it in monoethanolamine (MEA). MEA is commonly used as a solvent in gas treating processes, particularly for the removal of acidic gases like carbon dioxide and hydrogen sulfide from natural gas streams and other gas mixtures. When CO2-rich gas passes through an MEA solution, the CO2 reacts with the MEA to form a stable compound, effectively removing it from the gas stream. This process is known as amine gas treating or gas sweetening. MEA has several advantages for CO2 removal, including high selectivity for CO2, good absorption capacity, and ease of regeneration. Therefore, it is widely employed in industries for CO2 capture and removal from various gas streams, including reformed gas obtained from steam reforming of naphtha.