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Title: N-methyl-diethanolamine  
Author: World Heritage Encyclopedia
Language: English
Subject: Amine
Publisher: World Heritage Encyclopedia


Methyl diethanolamine

CAS number 105-59-9 YesY
PubChem 7767 YesY
ChemSpider 7479 N
EC number 203-312-7
MeSH N-methyldiethanolamine
RTECS number KL7525000
Beilstein Reference 1734441
Jmol-3D images Image 1
Molecular formula C5H13NO2
Molar mass 119.16 g mol−1
Appearance Colorless liquid
Odor Ammoniacal
Density 1.038 g mL−1
Melting point

-21 °C, 252.15 K, -6 °F

Boiling point

247 °C, 520.2 K, 477 °F

Solubility in water Miscible
Vapor pressure 1 Pa (at 20 °C)
Refractive index (nD) 1.4694
Viscosity 101 mPa s (at 20°C)
Routes of
GHS pictograms
GHS signal word WARNING
GHS hazard statements H319
GHS precautionary statements P305+351+338
EU Index 603-079-00-5
EU classification Xi
R-phrases R36
S-phrases (S2), S24
NFPA 704
Flash point 127 °C
410 °C
Explosive limits 1.4-8.8%
LD50 1.945 g kg−1 (oral, rat)
Related compounds
Related alkanols
Related compounds Diethylhydroxylamine
 N (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 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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