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Feasibilty study on the etherification of fermentative-produced isobutylene to fully renewable ethyl tert-buytl ether (ETBE)

: Tretbar, Maik; Witzel, Thomsen; Hauffe, Anika; Junghans, Ulrike; Bulc, Ales; Pufky-Heinrich, Daniela

Fulltext ()

Catalysts 8 (2018), No.11, Art. 514, 9 pp.
ISSN: 2073-4344
Journal Article, Electronic Publication
Fraunhofer IGB ()
ethyl tert-butyl ether (ETBE); biofuel additive; bio-sourced isobutylene; etherification; Amberlyst-15

This work evaluates the direct etherification of bio-sourced isobutylene with ethanol forming fully renewable ethyl tert-butyl ether (ETBE). Challenge was the use of the fermentative produced substrate in a solvent-free catalysis using the acidic ion exchanger Amberlyst-15. CO2 impurities have a significant influence on the liquid phase process. The conversion at a ratio that is based on molarities of isobutylene to ethanol of 1:0.9 results in yields up to 97 mol% ETBE. Purities up to 99 wt.% could be achieved by subsequent water extraction in order to ensure qualities for technical application as high performance fuel additive.