Alkanolamines for acid gas removal — MEA, DEA, and MDEA, plus piperazine as an MDEA activator — for natural gas sweetening and COu2082 capture service.
Les amines de traitement de gaz sont des alcanolamines qui absorbent chimiquement les gaz acides — sulfure d'hydrogène et dioxyde de carbone — d'un flux gazeux, puis les libèrent lorsque le solvant riche est régénéré à la chaleur. They split into two working classes: fast-reacting primary and secondary amines (MEA, DEA) that pull both Hu2082S and COu2082 hard, and tertiary MDEA, which favors Hu2082S and lets some COu2082 slip. Pick the class by what the gas specification requires, not by habit.
Monoethanolamine runs at lower concentrations, near 15-20 wt%, and carries high acid-gas capacity with fast kinetics, which suits bulk COu2082 and Hu2082S removal. The cost is honest: MEA needs more regeneration energy and degrades faster than the tertiary amines, so reclaiming and corrosion control matter. Diethanolamine sits between MEA and MDEA on reactivity and is common in refinery service. Specify MEA or DEA where you must strip COu2082 to a tight limit.
Methyldiethanolamine is the selective choice. It absorbs Hu2082S quickly but COu2082 slowly, runs at 40-50 wt%, and regenerates with less heat than MEA. When a unit needs both selectivity and faster COu2082 pickup, formulators add piperazine as an activator, which speeds COu2082 absorption without losing the energy advantage. Dose piperazine to the COu2082 duty, not the Hu2082S duty.
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