Optimization of the steam pretreatment step in the production of by unm8F6

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									                                  Poster Presentation 6A-26

             Pretreatment of Barley Husks for Ethanol Production
         Beatriz Palmarola-Adrados, Laura Diego-Meliveo, María Learra-Martínez,
                               Mats Galbe, Guido Zacchi*
                          Department of Chemical Engineering 1
                                     Lund University
                                      P. O. Box 124
                                SE-221 00, Lund, Sweden
       Phone: 46 46 222 82 97; Fax: 46 46 222 45 26; E-mail: guido.zacchi@kat.lth.se


Barley husks, produced worldwide in large quantities as a by-product of the barley milling
industry, were identified as a potentially promising feedstock for ethanol production. This
biomass consists mainly of glucan (29 %), xylan (24 %), arabinan (4 %) and lignin (14 %).
Enzymatic hydrolysis is not enough to hydrolyze these polysaccharides to simple sugars and,
therefore, chemical and physical methods are also required.

Several promising pretreatment methods, with and without addition of acid, and enzymatic
processes for conversion of cellulose and hemicellulose to fermentable sugars were evaluated.
Pretreatment was performed either in a steam pretreatment unit or in a microwave oven. The
influence of acid concentration, temperature and residence time on the sugar and ethanol
yields was investigated.

Results from this study will be presented.

								
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