N-Methyldiethanolamine

CAS 105-59-9

N-Methyldiethanolamine (CAS 105-59-9) shows how molecular structure determines chemical role. N-Methyldiethanolamine (MDEA, CAS 105-59-9) is a tertiary alkanolamine that combines one basic nitrogen with two hydroxyethyl groups. This dual character explains much of its industrial usefulness: the amine can accept protons and interact with acidic gases, while the hydroxyl groups provide water compatibility and additional formulation chemistry. PubChem and industrial sources list MDEA in gas treatment, chemical synthesis, coatings, water treatment, pH control, and related applications. It is especially important in acid-gas removal, where aqueous amine systems are used to separate hydrogen sulfide and carbon dioxide from process streams. Compared with primary and secondary amines, MDEA's tertiary nitrogen changes its reaction kinetics with carbon dioxide, allowing process engineers to tune selectivity and energy use in formulated.