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  • bioconversion of sawdust into ethanol using dilute sulfuric acid-assisted continuous twin screw-driven reactor pretreatment and fed-batch simultaneous saccharification and fermentation

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 763
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     ethanol production from poplar sawdust using sulfuric acid-assisted continuous twin screw-driven reactor (ctsr) pretreatment followed by simultaneous saccharification and fermentation (ssf) was investigated. pretreatment with high acid concentration increased the cellulose content in the pretreated solid (74.9–76.9% in the range of 4.0–5.5 wt.% h2so4). the sugar content (xmg; xylan + mannan + galactan) in the treated-solid was 11.1–15.2% and 0.9–5.7% with 0.5 wt.% and 7.0 wt.%, respectively. the xmg recovery yield of the sample treated with 4.0 wt.% h2so4 at 185 °c was maximized at 88.6%. enzymatic hydrolysis test showed a cellulose digestibility of 67.1%, 70.1%, and 73.6% with 15, 30, and 45 fpu/g-cellulose, respectively. in the fed-batch ssf tests with initial enzyme addition, the ethanol yield of each stage almost reached a maximum at 28 h, 48 h, and 56 h, respectively, with yields of 63.9% (16.5 g/l), 78.4% (30.1 g/l), and 81.7% (39.9 g/l), respectively.

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