Profitability for hydrogen and ammonia plants depends heavily on the efficiency and reliability of carbon dioxide(CO_2)removal-from process gas.Over the last 30 years,several innovations have evolved regarding CO_2-removal units.New methods have dramatically increased absorption efficiency,reduced CO_2 slip to a few parts per million by volume(ppmv),lowered energy requirements for CO_2 regeneration and mitigated corrosion of plant equipment.In addition,emerging technologies now apply non-toxic and environment-friendly solvent systems and activators for absorption,have shifted from physical to chemical modes for absorption or a combination of both,improved mass transfer through better gas-liquid contact and more.Result:Improved plant operations.
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