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ETBE

Ethyl Tertiary Butyl Ether (ETBE) is produced from ethanol and isobutylene in a catalytic reaction. Although ETBE can be produced from bioethanol, isobutylene is derived from fossil sources, so ETBE is not a pure biofuel.

However, blending with ETBE, improves the combustion characteristics of petrol, and ETBE is also more compatible with pipelines and engines than ethanol.

Further informaiton on ETBE is available from the European Fuel Oxygenates Association