Triacetin
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Triacetin is the organic compound with the formula C3H5(OCOCH3)3. It is classified as a triglyceride, i.e., the triester of glycerol with acetic acid.[6] It is a colorless, viscous, and odorless liquid with a high boiling point and a low melting point. It has a mild, sweet taste in concentrations lower than 500 ppm, but may appear bitter at higher concentrations.[7] It is one of the glycerine acetate compounds.
Quick Facts Names, Identifiers ...
Names | |
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Systematic IUPAC name
Propane-1,2,3-triyl triacetate | |
Other names
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Identifiers | |
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3D model (JSmol) |
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ChEBI | |
ChEMBL | |
ChemSpider |
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ECHA InfoCard | 100.002.775 |
EC Number |
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E number | E1518 (additional chemicals) |
KEGG |
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RTECS number |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
C9H14O6 | |
Molar mass | 218.205 g·mol−1 |
Appearance | Oily liquid |
Density | 1.155 g/cm3[3] |
Melting point | −78 °C (−108 °F; 195 K) at 760 mmHg[2] |
Boiling point | 259 °C (498 °F; 532 K) at 760 mmHg[2] |
6.1 g/100 mL[2] | |
Solubility | Miscible in EtOH Soluble in C6H6, (C2H5)2O, acetone[2] |
Vapor pressure | 0.051 Pa (11.09 °C) 0.267 Pa (25.12 °C) 2.08 Pa (45.05 °C)[4] ln(P/Pa)=22.819-4493/T(K)-807000/T(K)² |
Refractive index (nD) |
1.4301 (20 °C)[2] 1.4294 (24.5 °C)[4] |
Viscosity | 23 cP (20 °C)[3] |
Thermochemistry | |
Heat capacity (C) |
389 J/mol·K[5] |
Std molar entropy (S⦵298) |
458.3 J/mol·K[5] |
Std enthalpy of formation (ΔfH⦵298) |
−1330.8 kJ/mol[5] |
Std enthalpy of combustion (ΔcH⦵298) |
4211.6 kJ/mol[5] |
Hazards | |
NFPA 704 (fire diamond) | |
Flash point | 138 °C (280 °F; 411 K)[3] |
430 °C (806 °F; 703 K)[3] | |
Explosive limits | 7.73%[3] |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
1100 mg/kg (mice, oral)[3] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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