BioChem - DOS

Effects of surfactant on biochemical and hydrothermal conversion of softwood hemicellulose to ethanol and furan derivatives

Process biochemistry

Wei, L.; Shrestha, A.; Tu, M.; Adhikari, S.

This study was to explore the effects of surfactant on biochemical and hydrothermal conversion of hemicellulose into biofuels and value-added co-products. It was found that extraction of loblolly pine with 0.4% H<SUB>2</SUB>SO<SUB>4</SUB> (w/w) at 150<SUP>o</SUP>C for 2h can dissolve most of hemicellulose. The addition of surfactant (0.4% w/w) showed significant improvement on hemicellulose extraction, hemicellulose yield increased from 8.14+/-0.16% to 10.15+/-0.02% (w/w) based on raw biomass. Pre-extracted hemicellulose was fermented to ethanol by Saccharomyces cerevisiae. In the presence of 0.4% surfactant, the glucose consumption rate in the hydrolysate fermentation increased from 0.28gg<SUP>-1</SUP>h<SUP>-1</SUP> to 0.46gg<SUP>-1</SUP>h<SUP>-1</SUP>, and mannose consumption rate increased from 0.30gg<SUP>-1</SUP>h<SUP>-1</SUP> to 0.35gg<SUP>-1</SUP>h<SUP>-1</SUP>. The final ethanol concentration increased from 7.45+/-0.18g/L to 10.68+/-0.26g/L. It was also observed that the hemicellulose extract could be effectively converted to levulinic acid at low pH (&sim;2) by a hydrothermal process. Under the condition of 200<SUP>o</SUP>C for 45min, 38.61+/-1.06% of hexoses from the hydrolysate extracted by 0.4% of sulfuric acid converted to HMF, and 64.48+/-1.20% of pentoses to furfural. The addition of surfactant (0.4% w/w) significantly increased the selectivity of furan by 41% for HMF and 30% for furfural.

2011

Elsevier Applied Science

1359-5113

46

9

pp.1785-1792

10.1016/j.procbio.2011.06.001

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART57089924

Hemicellulose extraction; Surfactant; Fermentation; Hydrothermal conversion; Furan derivatives