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 interactive 3D 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
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%
Lethal dose or concentration (LD, LC):
1.945 g kg−1 (oral, rat)
Related compounds
Related alkanols
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
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.

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] MDEA's defining characteristic when compared to these other amines is its ability to preferentially remove H2S (and slip CO2) from sour gas streams.[citation needed].

MDEA's popularity as a solvent for gas treating stems from several advantages it has when compared to other alkanolamines. One of these advantages is a low vapor pressure, which allows for high amine compositions without appreciable losses through the absorber and regenerator. MDEA is also resistant to thermal and chemical degradation and is largely immiscible with hydrocarbons. Lastly, MDEA has a relatively low heat of reaction with hydrogen sulfide and carbon dioxide, which allows for lower reboiler duties, thus lower operating costs.

This compound should not be confused with the recreational drug methylenedioxyethylamphetamine which is also abbreviated MDEA.

See also[edit]


  • The GPSA Databook