Global InformationMethyldiethanolamine information
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| Names | |
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| Preferred IUPAC name
2,2′-(Methylazanediyl)di(ethan-1-ol) | |
| Other names
Bis(2-hydroxyethyl)(methyl)amine
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| Identifiers | |
CAS Number
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3D model (JSmol)
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Beilstein Reference
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1734441 |
| ChEMBL |
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| ChemSpider |
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| ECHA InfoCard | 100.003.012 |
| EC Number |
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| MeSH | N-methyldiethanolamine |
PubChem CID
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| RTECS number |
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| UNII |
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CompTox Dashboard (EPA)
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InChI
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SMILES
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| Properties | |
Chemical formula
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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 |
Solubility in water
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Miscible |
| Vapor pressure | 1 Pa (at 20 °C) |
Refractive index (nD)
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1.4694 |
| Viscosity | 101 mPa s (at 20°C) |
| Pharmacology | |
Routes of
administration |
Oral |
| Hazards | |
| GHS labelling: | |
Pictograms
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Signal word
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Warning |
Hazard statements
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H319 |
Precautionary statements
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P305+P351+P338 |
| NFPA 704 (fire diamond) | 
1
1
0 |
| Flash point | 127 °C (261 °F; 400 K) |
Autoignition
temperature |
410 °C (770 °F; 683 K) |
| Explosive limits | 1.4-8.8% |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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1.945 g kg−1 (oral, rat) |
| Related compounds | |
Related alkanols
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Related compounds
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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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Infobox references
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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.
- ^ 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