Methyldiethanolamine
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.
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.
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Product Info
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| Names | |
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| Preferred IUPAC name
2,2′-(Methylazanediyl)di(ethan-1-ol)
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| Other names
Bis(2-hydroxyethyl)(methyl)amine
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| Identifiers | |
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3D model (JSmol)
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| 1734441 | |
| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.003.012 |
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| MeSH | N-methyldiethanolamine |
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PubChem CID
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| UNII | |
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CompTox Dashboard (EPA)
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| 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) |
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Refractive index (nD)
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1.4694 |
| Viscosity | 101 mPa s (at 20°C) |
| Pharmacology | |
| Oral | |
| Hazards | |
| GHS labelling: | |
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| Warning | |
| H319 | |
| P305+P351+P338 | |
| NFPA 704 (fire 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): | |
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LD50 (median dose)
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1.945 g kg−1 (oral, rat) |
| Related compounds | |
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Related alkanols
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Related compounds
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Diethylhydroxylamine |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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