Product Details
Methyl acetate, also known as MeOAc, maleic-anhydride.html">material/acetic-acid.html">acetic acid methyl ester or methyl ethanoate, is a carboxylate ester with the formula CH3COOCH3. It is a flammable liquid with a characteristically pleasant smell reminiscent of some glues and nail polish removers. Methyl acetate is occasionally used as a solvent, being weakly polar and lipophilic, but its close relative ethyl acetate is a more common solvent being less toxic and less soluble in water. Methyl acetate has a solubility of 25% in water at room temperature. At elevated temperature its solubility in water is much higher. Methyl acetate is not stable in the presence of strong aqueous bases or aqueous acids. Methyl acetate is VOC exempt.
Parameters
| Property | Value |
| Melting point | -98 °C (lit.) |
| Boiling point | 57-58 °C (lit.) |
| density | 0.934 g/mL at 25 °C |
| vapor density | 2.55 (vs air) |
| vapor pressure | 165 mm Hg ( 20 °C) |
| refractive index | n20/D 1.361(lit.) |
| FEMA | 2676 | METHYL ACETATE |
| Fp | 3.2 °F |
| storage temp. | no restrictions. |
| solubility | 250g/l |
| form | Solution |
| color | Clear colorless to slightly pale yellow |
| Relative polarity | 0.253 |
| Odor | Slightly acrid, sweet; fragrant. |
| PH | 7 |
| biological source | synthetic |
| Odor Threshold | 1.7ppm |
| Odor Type | ethereal |
| explosive limit | 3.1-16%(V) |
| Water Solubility | 250 g/L (20 ºC) |
| λmax | λ: 255 nm Amax: 1.0 λ: 275 nm Amax: 0.1 λ: 300 nm Amax: 0.01 |
| Merck | 14,6008 |
| JECFA Number | 125 |
| BRN | 1736662 |
| Henry's Law Constant | 0.90 at 20.00 °C, 1.56 at 30.00 °C (headspace-GC, Hovorka et al., 2002) |
| Exposure limits | TLV-TWA 200 ppm (～610 mg/m3) (ACGIH, MSHA, and OSHA); TLV-STEL 250 ppm (～760 mg/m3) (ACGIH); IDLH 10,000 ppm (NIOSH). |
| Dielectric constant | 7.3（20℃） |
| Stability: | Stable. Extremely flammable - readily forms explosive mixtures with air. Note low flash point and wide explosion limits. Incompatible with strong oxidizing agents, strong bases, strong acids, nitrates. May be moisture sensitive. |
| Cosmetics Ingredients Functions | PERFUMING SOLVENT |
| LogP | 0.18 at 20℃ |
| Surface tension | 25.4mN/m at 298.15K |
| CAS DataBase Reference | 79-20-9(CAS DataBase Reference) |
| NIST Chemistry Reference | Acetic acid , methyl ester(79-20-9) |
| EPA Substance Registry System | Methyl acetate (79-20-9) |
Safety Information
| Item | Details |
| Hazard Codes | F,Xi |
| Risk Statements | 11-36-66-67 |
| Safety Statements | 16-26-29-33 |
| OEB | A |
| OEL | TWA: 200 ppm (610 mg/m3), STEL: 250 ppm (760 mg/m3) |
| RIDADR | UN 1231 3/PG 2 |
| WGK Germany | 1 |
| RTECS | AI9100000 |
| Autoignition Temperature | 936 °F |
| TSCA | Yes |
| HS Code | 2915 39 00 |
| HazardClass | 3 |
| PackingGroup | II |
| Hazardous Substances Data | 79-20-9(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: > 5000 mg/kg LD50 dermal Rat > 2000 mg/kg |
| IDLA | 3,100 ppm [10% LEL] |
Product Application of Methyl acetate CAS#79-20-9
Methyl acetate may be used for the preparation of fatty acid methyl esters and triacetin from rapeseed oil via non-catalytic trans-esterification reaction under super-critical conditions.
Methyl acetate may be used in the following:
- As acyl acceptor in the preparation of biodiesel.
- Synthesis of ethanol.
- Preparation of n-butyl acetate, via transesterification reaction with n-butanol in the presence of acidic catalysts.
It may also be used as a precursor in the synthesis of the following:
- acetic anhydride
- methyl acrylate
- vinyl acetate
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