Methyl diethanolamine

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Methyl diethanolamine
Skeletal formula of methyl diethanolamine
Other names
Bis(2-hydroxyethyl)methylamine[citation needed]
105-59-9 YesY
ChemSpider 7479 N
EC number 203-312-7
Jmol-3D images Image
MeSH N-methyldiethanolamine
PubChem 7767
RTECS number KL7525000
Molar mass 119.16 g·mol−1
Appearance Colorless liquid
Odor Ammoniacal
Density 1.038 g mL−1
Melting point −21.00 °C; −5.80 °F; 252.15 K
Boiling point 247.1 °C; 476.7 °F; 520.2 K
Vapor pressure 1 Pa (at 20 °C)
Viscosity 101 mPa s (at 20°C)
GHS pictograms The exclamation-mark pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)
GHS signal word WARNING
EU Index 603-079-00-5
EU classification Irritant Xi
R-phrases R36
S-phrases (S2), S24
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oil Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point 127 °C (261 °F; 400 K)
410 °C (770 °F; 683 K)
Explosive limits 1.4-8.8%
1.945 g kg−1 (oral, rat)
Related compounds
Related alkanols
Related compounds
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N verify (what isYesY/N?)
Infobox references

Methyl diethanolamine is a clear, colorless or pale yellow liquid with an ammonia odor. 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 recreational drug methylenedioxyethylamphetamine which is also abbreviated 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.[citation needed]

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

See also[edit]


  • The GPSA Databook