Comparative material balances and preliminary technical analysis of the pilot scale sugarcane bagasse alkaline pretreatment to 2G ethanol production

•Mass balance indicated the most selective condition as 130 °C with AQ.•Proposed technology can achieve 207.7 L of ethanol/ton lignocellulosic material.•2G ethanol production represents an increment of 14.6% in the productivity in L/ton sugarcane.•Profitability hugely depends on high solids in pretr...

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Bibliographic Details
Published in:	Industrial crops and products Vol. 120; pp. 187 - 197
Main Authors:	Nakanishi, S.C., Nascimento, V.M., Rabelo, S.C., Sampaio, I.L.M., Junqueira, T.L., Rocha, G.J.M.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 15-09-2018
Subjects:	2G ethanol Alkaline pretreatment Anthraquinone Mass balance Sugarcane bagasse Technical analysis Mass balance Technical analysis Anthraquinone Alkaline pretreatment Sugarcane bagasse 2G ethanol
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Summary:	•Mass balance indicated the most selective condition as 130 °C with AQ.•Proposed technology can achieve 207.7 L of ethanol/ton lignocellulosic material.•2G ethanol production represents an increment of 14.6% in the productivity in L/ton sugarcane.•Profitability hugely depends on high solids in pretreatment and/or hydrolyses steps.•Lignin energy use and/or lignin valorization can promote viability for the process. Material balance and preliminary technical analyses of pilot scale sugarcane bagasse alkaline pretreatment, using sodium hydroxide with and without anthraquinone (AQ) addition were analyzed and compared to elucidate the carbohydrates and phenolic components flux in the streams. The lowest carbohydrates solubilization rates (9% wt for cellulose and 41% wt for hemicelluloses) were reached for the condition at 130 °C with AQ addition, however the highest lignin solubilization (87% wt) was accomplished for the condition using 170 °C with AQ addition. Preliminary technical analysis was carried out to evaluate the performance of the best pretreatment condition when integrated to a first and second generation ethanol plant, in a biorefinery concept, showing that 83.03 m3/h of ethanol can be produced by this process. Ethanol production (in L/ton biomass) for proposed process is 8.1% lower than the expected for short terms technologies concluding that upgrades on the process, as higher solids concentrations and lignin energy use or, principally, lignin valorization must be performed to allow viability of the process.
ISSN:	0926-6690 1872-633X
DOI:	10.1016/j.indcrop.2018.04.064