Product Description
Methyl tert-butyl ether (MTBE) is a colorless liquid with a characteristic unpleasant odor. It is produced by combining chemical substances such as isobutylene and methanol. Since the 1980s, MTBE has been widely used as an additive in unleaded gasoline to improve combustion efficiency.
In addition, MTBE has applications in gallstone dissolution treatment. In this procedure, MTBE is directly delivered into the gallbladder through specially inserted tubes to assist in dissolving gallstones.
Properties
| Melting point | -110 °C |
| Boiling point | 55-56 °C(lit.) |
| density | 0.7404 |
| vapor density | 3.1 (vs air) |
| vapor pressure | 4.05 psi ( 20 °C) |
| refractive index | n20/D 1.369(lit.) |
| Fp | -27 °F |
| storage temp. | Store at +2°C to +25°C. |
| solubility | 42g/l |
| form | Powder or Needles |
| color | APHA: ≤10 |
| Specific Gravity | 0.74 |
| Odor | Characteristic ethereal odor |
| Relative polarity | 0.124 |
| explosive limit | 1.5-8.5%(V) |
| Water Solubility | 51 g/L (20 ºC) |
| FreezingPoint | -108.6℃ |
| λmax | λ: 210 nm Amax: 1.0 |
| λ: 225 nm Amax: 0.50 | |
| λ: 250 nm Amax: 0.10 | |
| λ: 300-400 nm Amax: 0.005 | |
| Merck | 146032 |
| BRN | 1730942 |
| Exposure limits | ACGIH: TWA 50 ppm |
| Dielectric constant | 4.5 |
| Stability: | Stable, but may form explosive peroxides in contact with air. Extremely flammable - note low flash point. Incompatible with strong oxidizing agents. |
| InChIKey | BZLVMXJERCGZMT-UHFFFAOYSA-N |
| LogP | 1.06 at 20℃ |
| CAS DataBase Reference | 1634-04-4(CAS DataBase Reference) |
| IARC | 3 (Vol. 73) 1999 |
| NIST Chemistry Reference | Propane, 2-methoxy-2-methyl-(1634-04-4) |
| EPA Substance Registry System | Methyl tert-butyl ether (1634-04-4) |
| Hazard Codes | Xn,F,Xi,T |
| Risk Statements | 36/37/38-40-38-11-39/23/24/25-23/24/25 |
| Safety Statements | 9-16-24-45-36/37-7 |
| RIDADR | UN 2398 3/PG 2 |
| WGK Germany | 3 |
| RTECS | KN5250000 |
| F | 46091 |
| Autoignition Temperature | 705 °F |
| TSCA | Yes |
| HS Code | 2909 19 90 |
| HazardClass | 3 |
| PackingGroup | II |
| Hazardous Substances Data | 1634-04-4(Hazardous Substances Data) |
| Toxicity | . LC50 in mice (15 min): 1.6 mmol/liter of atmosphere (Marsh) |
Product Usage
Methyl tert-butyl ether (MTBE) was widely used as an additive in unleaded gasoline in the United States before 2005. It is also utilized in the production of isobutene and serves as a chromatographic eluent, particularly in high-performance liquid chromatography (HPLC) applications.
In addition, MTBE has pharmaceutical applications and can be introduced into the gallbladder for gallstone dissolution treatment. Tert-butyl methyl ether is also used in the petrochemical industry. Through the reverse reaction of its synthesis process, MTBE can be converted into isobutene and methanol over acidic catalysts at temperatures higher than those used for MTBE production.
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