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Methyldiethanolamine, also known as N-methyl diethanolamine and more commonly as MDEA, is the organic compound with the formula CH₃N(C₂H₄OH)₂. It is a colorless liquid with an ammonia odor. It is miscible with water, alcohol, and benzene. As a tertiary amine, it is widely used as a sweetening agent in chemical plants, oil refineries, syngas, and natural gas production. MDEA is less corrosive with lower energy requirements used in acid gas removal applications.
| MDEA is an excellent solution for selectivity between H2S and CO2 removal. | It can be used in higher concentrations up to 55wt%. |