Product Description of tert-Butyl Methyl Ether CAS#1634-04-4
tert-Butyl methyl ether, commonly abbreviated as MTBE, is a clear, colorless volatile ether liquid with a mild ether odor. It is partially soluble in water and fully miscible with most organic solvents. It maintains good chemical stability under neutral, alkaline and weakly acidic environments.
This product features a high octane number and moderate dissolving capacity, supplied with stable purity and consistent batch quality. It is widely recognized as a classic gasoline oxygenate additive and also serves as an extraction solvent and reaction medium for fine chemical, pharmaceutical and chromatographic applications.
tert-Butyl Methyl Ether Chemical Properties
| Melting point | -110 °C |
| Boiling point | 55-56 °C(lit.) |
| density | 0.7404 g/cm³ |
| 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 | Liquid |
| color | Colorless |
| 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 Application of tert-Butyl Methyl Ether CAS#1634-04-4
MTBE was widely used as an oxygenate additive for unleaded gasoline in the United States before 2005, and it remains a common gasoline octane booster in many other regions worldwide. It serves as a feedstock to produce isobutene, and it is widely adopted as a chromatographic eluent for HPLC analysis.
It is also applied in pharmaceutical research for cholesterol gallstone contact dissolution. In petrochemical manufacturing, MTBE can undergo catalytic decomposition under acidic conditions and elevated temperature, reversing the synthesis reaction to yield isobutene and methanol.
