Methyl diethanolamine

Methyl diethanolamine
Methyl diethanolamine
CAS number 105-59-9 YesY
PubChem 7767
RTECS number KL7525000
Molecular formula CH3N(C2H4OH)2
Molar mass 119.163 g/mol
Appearance Clear, colorless, 150 APHA max.
Density 1.043 g/cm3
Melting point


Boiling point


Solubility in water complete
Solubility Benzene, alcohol
Refractive index (nD) 1.4694
Viscosity 101 cP @ 20°C
Routes of
NFPA 704
NFPA 704.svg
Flash point 135°C pmcc
Explosive limits 0.9-8.4 vol% in air
 YesY diethanolamine (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

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.

See also


  • The GPSA Databook

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