Methyldiethanolamine

Methyldiethanolamine
Skeletal formula of methyl diethanolamine
Names
Preferred IUPAC name
2,2′-(Methylazanediyl)di(ethan-1-ol)
Other names
Bis(2-hydroxyethyl)(methyl)amine
Identifiers
3D model (JSmol)
1734441
ChEMBL
ChemSpider
ECHA InfoCard 100.003.012 Edit this at Wikidata
EC Number
  • 203-312-7
MeSH N-methyldiethanolamine
RTECS number
  • KL7525000
UNII
  • InChI=1S/C5H13NO2/c1-6(2-4-7)3-5-8/h7-8H,2-5H2,1H3 ☒N
    Key: CRVGTESFCCXCTH-UHFFFAOYSA-N checkY
  • CN(CCO)CCO
Properties
C5H13NO2
Molar mass 119.164 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
Miscible
Vapor pressure 1 Pa (at 20 °C)
1.4694
Viscosity 101 mPa s (at 20°C)
Pharmacology
Oral
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H319
P305+P351+P338
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
1
0
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
 Diethylhydroxylamine
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Methyldiethanolamine, also known as N-methyl diethanolamine and more commonly as MDEA, is the organic compound with the formula CH3N(C2H4OH)2. It is a colorless liquid with an ammonia odor. It is miscible with water, ethanol and benzene. A tertiary amine, it is widely used as a sweetening agent in chemical, oil refinery, syngas production and natural gas.[1]

Similar compounds are monoethanolamine (MEA), a primary amine, and diethanolamine (DEA), a secondary amine, both of which are also used for amine gas treating. MDEA's defining characteristic when compared to these other amines is its ability to preferentially remove H2S (and strip CO2) from sour gas streams.[1]

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. MDEA is a common base note in perfumes to allow the fragrance to last. 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.

  1. ^ a b Matthias Frauenkron, Johann-Peter Melder, Günther Ruider, Roland Rossbacher, Hartmut Höke "Ethanolamines and Propanolamines" in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim.doi:10.1002/14356007.a10_001