Improved Pretreatment Process of Wheat Straw with Direct Steam Injection
Ballmann, P., Müller, M., Gasser, E., Dröge, S., König, H.
The rising demands for biofuels and other biobased chemical products enlarge the demand of raw material feedstock. Lignocelluloses, especially from residual biomass like straw, have great potential to fit that gap. The processing of lignocelluloses by an enzymatic saccharification requires a set of pretreatment steps. Different kinds of pretreatment techniques are described in the literature. One mostly used, the diluted acid pretreatment with mineral acids, is a state of the art technique and used in this study. The purpose of this work was an effective diluted acid pretreatment of whole bale wheat straw with direct steam injection in pilot scale. Additional mechanical pretreatment by using a hammer or cutting mill was renounced. Mechanical pretreatment increases the energy demand and makes the process uneconomical. The results of the study showed the high effectiveness of the direct steam injection. The upscale process in the 425 LReactor was successful. High sugar yields were reached in the pretreatment process of a complete straw bale. Almost 68 % of the total available sugar was released after the subsequent enzymatic hydrolysis.
agricultural residues, biomass, lignocellulose, steam, wheat straw
R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals
21st European Biomass Conference and Exhibition
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