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Steam refining of non-debarked spruce forest residues was investigated as pretreatment for enzymatic hydrolysis as well as for biogas production. Pretreatment conditions were varied in the range of 190–220°C, 5–10min and 0–3.7% SO 2 according to a statistical design. For both applications highest product yields were predicted at 220°C and 2.4% SO 2 , whereas the reaction time had only...
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