Ethyl tert-butyl ether

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Ethyl tert-butyl ether[1]
Ball-and-stick model
IUPAC name
Other names
Ethyl tert-butyl ether
Ethyl tertiary butyl ether
Ethyl tert-butyl oxide
tert-Butyl ethyl ether
Ethyl t-butyl ether
3D model (JSmol)
Abbreviations ETBE
ECHA InfoCard 100.010.282
EC Number 211-309-7
RTECS number KN4730200
Molar mass 102.18
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)
1.2 g/100 g
R-phrases (outdated) R11 R20
S-phrases (outdated) S16
Flash point −19 °C (−2 °F; 254 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY verify (what is YesYN ?)
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]