Methyl Diethanolamine

Methyl diethanolamine is a clear, colorless or pale yellow liquid with an ammonia odour. It is miscible with water, alcohol and benzene. Methyl diethanolamine is also known as N-Methyl diethanolamine and more commonly as MDEA. It has the formula CH3N (C2H4OH)2. MDEA is a tertiary amine and is widely used as a sweetening agent in chemical, oil refinery, syngas production and natural gas. This compound should not be confused with the similarly named commercial drug MDEA.

MDEA's popularity as a solvent for gas treating stems from several advantages it has over other alkanolamines, especially its ability to preferentially remove H2S (and slip CO2) from sour gas streams.

Similar compounds are monoethanolamine (MEA), a primary amine, and diethanolamine (DEA), a secondary amine, both of which are also used for amine gas treating.

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