A Comparison between Lime and Alkaline Hydrogen Peroxide Pretreatments of Sugarcane Bagasse for Ethanol Production |
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Authors: | Sarita C Rabelo Rubens Maciel Filho Aline C Costa |
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Institution: | (1) Department of Chemical Process, School of Chemical Engineering, State University of Campinas (UNICAMP), Campinas, SP, Brazil |
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Abstract: | Pretreatment procedures of sugarcane bagasse with lime (calcium hydroxide) or alkaline hydrogen peroxide were evaluated and
compared. Analyses were performed using 2 × 2 × 2 factorial designs, with pretreatment time, temperature, and lime loading
and hydrogen peroxide concentration as factors. The responses evaluated were the yield of total reducing sugars (TRS) and
glucose released from pretreated bagasse after enzymatic hydrolysis. Experiments were performed using the bagasse as it comes
from an alcohol/sugar factory and bagasse in the size range of 0.248 to 1.397 mm (12–60 mesh). The results show that when
hexoses and pentoses are of interest, lime should be the pretreatment agent chosen, as high TRS yields are obtained for nonscreened
bagasse using 0.40 g lime/g dry biomass at 70 °C for 36 h. When the product of interest is glucose, the best results were
obtained with lime pretreatment of screened bagasse. However, the results for alkaline peroxide and lime pretreatments of
nonscreened bagasse are not very different. |
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Keywords: | Lignocellulosic materials Sugarcane bagasse Pretreatment Lime Hydrogen peroxide Enzymatic hydrolysis Statistical analysis |
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