Ethyl tert-butyl ether

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Ethyl tert-butyl ether[1]
Ball-and-stick model
Abbreviations ETBE
CAS number 637-92-3 YesY
PubChem 12512
ChemSpider 11996 YesY
EC number 211-309-7
RTECS number KN4730200
Jmol-3D images Image 1
Molecular formula C6H14O
Molar mass 102.17 g mol−1
Appearance Clear colorless liquid
Density 0.7364 g/cm3
Melting point −94 °C (−137 °F; 179 K)
Boiling point 69 to 71 °C (156 to 160 °F; 342 to 344 K)
Solubility in water 1.2 g/100 g
R-phrases R11 R20
S-phrases S16
Flash point −19 °C (−2 °F; 254 K)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Ethyl tert-butyl ether (ETBE) is commonly used as an oxygenate gasoline additive in the production of gasoline from crude oil. ETBE offers equal or greater air quality benefits than ethanol, while being technically and logistically less challenging. Unlike ethanol, ETBE does not induce evaporation of gasoline, which is one of the causes of smog, and does not absorb moisture from the atmosphere.


It is synthesized by mixing ethanol and isobutylene and reacting them with heat over a catalyst.

ETBE-Synthese (Reaktionsgleichung).png

Ethanol, produced by fermentation and distillation, is more expensive than methanol, which is derived from natural gas. Therefore, MTBE, made from methanol is cheaper than ETBE, made from ethanol.

See also[edit]


  1. ^ Merck Index, 11th Edition, 3732.

External links[edit]