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Poster Presentation 1-15
Dilute-Acid Hydrolysis of Hemicellulose from Silage Presscake
Markus Neureiter1, Herbert Danner1, Sabine Frühauf1, Christiane Thomasser1, Stefan Kromus2, Rudolf Braun1 and Michael Narodoslawski3
1Department of Environmental Biotechnology Institute for Agrobiotechnology, Konrad Lorenz Str. 20, A-3430 Tulln, Austria
2Kornberg Institut, Steirisches Vulkanland Regionalentwicklung GmbH Haus der Region, Dörfl 2, A-8330 Kornberg
3Institut für Grundlagen der Verfahrenstechnik und Anlagentechnik Technische Universität Graz Inffeldgasse 25/C/II, A-8010 Graz
Telephone: 43-2272-66280-517; Fax.: 43-2272-66280-503; E-Mail: neureite@ifa.tulln.ac.at
Production of silage from forage grasses by lactic acid fermentation is a common process for conserving animal feed. Another possibility for the use of silages is to fractionate them into valuable products like lactic acid, proteins, and fibers. During this refining process the silage is pressed, in order to obtain a juice which is rich in lactic acid and proteins; whereas the solid residue consists of approximately 30-35% cellulose, 15-25% hemicellulose, and 20% substance which cannot be hydrolyzed in sulfuric acid. The hemicellulose fraction of this material can be converted into monosaccharides by dilute sulfuric acid at moderate conditions and thus yield a low-priced substrate for fermentations.
Since the material has a high puffer capacity, it was necessary to remove the responsible substances in an extraction step prior to hydrolysis. The experiments were carried out in a 20-L batch hydrolysis reactor. Investigated parameters are reaction temperature, acid concentration, and dry matter substance. The experiments were conducted using a statistical experiment design. More than 20% of the dry raw material could be converted into monosaccharides in the best experiments.
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