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- Oliveira, Fernando M.V., et al.
(författare)
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Industrial-scale steam explosion pretreatment of sugarcane straw for enzymatic hydrolysis of cellulose for production of second generation ethanol and value-added products
- 2013
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Ingår i: Bioresource Technology. - : Elsevier. - 0960-8524 .- 1873-2976. ; 130, s. 168-173
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Tidskriftsartikel (refereegranskat)abstract
- Steam explosion at 180, 190 and 200 °C for 15 min was applied to sugarcane straw in an industrial sugar/ethanol reactor (2.5 m3). The pretreated straw was delignificated by sodium hydroxide and hydrolyzed with cellulases, or submitted directly to enzymatic hydrolysis after the pretreatment. The pretreatments led to remarkable hemicellulose solubilization, with the maximum (92.7%) for pretreatment performed at 200 °C. Alkaline treatment of the pretreated materials led to lignin solubilization of 86.7% at 180 °C, and only to 81.3% in the material pretreated at 200 °C. All pretreatment conditions led to high hydrolysis conversion of cellulose, with the maximum (80.0%) achieved at 200 °C. Delignification increase the enzymatic conversion (from 58.8% in the cellulignin to 85.1% in the delignificated pulp) of the material pretreated at 180 °C, but for the material pretreated at 190 °C, the improvement was less remarkable, while for the pretreated at 200 °C the hydrolysis conversion decreased after the alkaline treatment.
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- Rocha, George J. M., et al.
(författare)
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Effect of Xylan and Lignin Removal by Hydrothermal Pretreatment on Enzymatic Conversion of Sugarcane Bagasse Cellulose for Second Generation Ethanol Production
- 2013
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Ingår i: Sugar Tech. - : Springer Science and Business Media LLC. - 0974-0740 .- 0972-1525. ; 15:4, s. 390-398
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Tidskriftsartikel (refereegranskat)abstract
- This work was aimed to evaluate the effect of the removal of hemicellulose and lignin, by hydrothermal pretreatment, carried out at four different temperatures, namely 180, 185, 190 and 195 °C, for 10 min in a 20-L reactor, and alkaline delignification with 1.0 % (w/v) NaOH, at 100 °C for 1 h, on the enzymatic saccharification of sugarcane bagasse cellulose. For the material pretreated under the most severe conditions (1.0 % (w/v) NaOH, 100 °C, 1 h and 195 °C, 10 min), 95.8 % of the hemicellulosic fraction and 80.9 % of lignin were solubilised upon pretreatment and delignification respectively. The enzymatic conversion of the material obtained under those conditions reached 89.2 % of the initial cellulose, whereas it was 69.2 % for the pretreated but non-delignified material and only 6.0 % for raw bagasse. Models describing the effect of hemicellulose and lignin content on the enzymatic hydrolysis were developed. The statistical analysis of the results emphasized the significance of removal of the hemicellulose and lignin for improving the enzymatic hydrolysis of cellulose.
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