ETBE
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Ethyl tertiary butyl ether (ETBE) is commonly used as a blend stock in the production of gasoline from crude oil. It is created by mixing ethanol and isobutene and reacting them with heat over a catalyst. ETBE offers equal or greater air quality benefits as ethanol, while being technically and logistically less challenging.
[edit] See also
MTBE (methyl tertiary-butyl ether)