Dimethyl ether
Dimethyl ether (DME; also known as methoxymethane) is the organic compound with the formula CH3OCH3, (sometimes ambiguously simplified to C2H6O as it is an isomer of ethanol). The simplest ether, it is a colorless gas that is a useful precursor to other organic compounds and an aerosol propellant that is currently being demonstrated for use in a variety of fuel applications.
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| Names | |||
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| Preferred IUPAC name
Methoxymethane | |||
| Other names
Dimethyl ether R-E170 Demeon Dimethyl oxide Dymel A Methyl ether Methyl oxide Mether Wood ether | |||
| Identifiers | |||
3D model (JSmol) |
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| Abbreviations | DME | ||
| 1730743 | |||
| ChEBI | |||
| ChEMBL | |||
| ChemSpider | |||
| ECHA InfoCard | 100.003.696 | ||
| EC Number |
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| KEGG | |||
| MeSH | Dimethyl+ether | ||
PubChem CID |
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| RTECS number |
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| UNII | |||
| UN number | 1033 | ||
CompTox Dashboard (EPA) |
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| Properties | |||
| C2H6O | |||
| Molar mass | 46.069 g·mol−1 | ||
| Appearance | Colorless gas | ||
| Odor | Ethereal | ||
| Density | 2.1146 kg m−3 (gas, 0 °C, 1013 mbar) 0.735 g/mL (liquid, −25 °C) | ||
| Melting point | −141 °C; −222 °F; 132 K | ||
| Boiling point | −24 °C; −11 °F; 249 K | ||
| 71 g/L (at 20 °C (68 °F)) | |||
| log P | 0.022 | ||
| Vapor pressure | 592.8 kPa | ||
| −26.3×10−6 cm3 mol−1 | |||
| 1.30 D | |||
| Thermochemistry | |||
Heat capacity (C) |
65.57 J K−1 mol−1 | ||
Std enthalpy of formation (ΔfH⦵298) |
−184.1 kJ mol−1 | ||
Std enthalpy of combustion (ΔcH⦵298) |
−1460.4 kJ mol−1 | ||
| Hazards | |||
| GHS labelling: | |||
| Danger | |||
| H220, H280 | |||
| P210, P377, P381, P403 | |||
| NFPA 704 (fire diamond) | |||
| Flash point | −41 °C (−42 °F; 232 K) | ||
| 350 °C (662 °F; 623 K) | |||
| Explosive limits | 27 % | ||
| Safety data sheet (SDS) | ≥99% Sigma-Aldrich | ||
| Related compounds | |||
Related ethers |
Diethyl ether | ||
Related compounds |
Ethanol | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |||
Dimethyl ether was first synthesised by Jean-Baptiste Dumas and Eugene Péligot in 1835 by distillation of methanol and sulfuric acid.
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