Otimização do pré-tratamento hidrotérmico da palha de cana-de-açúcar visando à produção de etanol celulósico

Santos, Fernando; Queiroz, José Humberto de; Colodette, Jorge Luiz; Manfredi, Mauro; María, Eliana; Queiroz, L. R.; Soares, Filippe Elias de Freitas

doi:10.1590/s0100-40422014000100011

Cited by 37 publications

(24 citation statements)

References 7 publications

(15 reference statements)

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“…Here we have employed straw and tops separately, reaching 40 g/L of glucose release from the experiments with the tops as a starting biomass and 29 g/L for the straw. This observation suggests that the use of the tops appears to contribute to the high conversion of cellulose to glucose found by Santos et al (2013), which is also probably related to the lower levels of lignin in the composition of the tops (see Table 1). …”

Section: Methodsmentioning

confidence: 88%

“…It is noteworthy that the results for the sugarcane bagasse were lower in both process steps (see Figures 1 and 2). Santos et al (2013) employed the hydrothermally pretreated trash for the bioethanol production. According to the authors, the step of enzymatic saccharification was significantly improved with the use of this pretreatment technology.…”

Section: Methodsmentioning

confidence: 99%

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Feasibility of Ethanol Production Using the Whole Sugarcane Biomass

Pereira¹,

Maehara²,

Machado³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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-Each ton of processed sugarcane generates about 280 kg of residues (bagasse, straw and tops). The full use of sugarcane biomass could greatly improve the ethanol productivity without expanding the cultivated areas. Bagasse has been widely studied for ethanol production unlike other sugarcane parts. Hence, we assessed the use of the whole sugarcane biomass (bagasse, straw and tops) for ethanol production. Biomasses were pretreated with 1.5% (w/v) sulfuric acid at 10% solids and then they were hydrolyzed by commercial enzymes at 30 FPU/g glucan . Hydrolysates were fermented by industrial strain of Saccharomyces cerevisiae. Tops were the most susceptible to enzymatic degradation reaching glucose levels up to 40 g/L while the highest efficiency of fermentation (up to 74%) was found for straw. Bagasse achieved lower results than the other parts. Thus, the potential application of sugarcane biomass for ethanol production can be clearly improved with the combined use of bagasse, straw and tops.

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Section: Methodsmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Feasibility of Ethanol Production Using the Whole Sugarcane Biomass

Pereira¹,

Maehara²,

Machado³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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“…Response surface analysis is a method that comprises a set of mathematical and statistical procedures used in the model to develop, improve and optimize processes (Zhang et al, 2009;Santos et al, 2014). With surface analysis response, the best conditions of hydrothermal pre-treatment in sugarcane were determined (Ferreira et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Wheat yield obtained from nitrogen dose and fractionation

Brezolin¹,

Silvae²,

Roos‐Frantz³

et al. 2017

Afr. J. Agric. Res.

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“…Diferentes fontes de energia renováveis estão sendo estudadas com o objetivo de complementar àquelas derivadas do petróleo. Nesse contexto, as biomassas lignocelulósicas surgem como uma boa alternativa para essa finalidade [1,2,3].…”

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“…Ademais, a etapa de deslignificação não promoveu melhora significativa na conversão da celulose a glicose na hidrólise enzimática. Santos et al (2014) [3] realizaram tratamento hidrotérmico da palha de cana, utilizando planejamento experimental (variáveis: temperatura entre 170 e 210 °C, tempo entre 5 e 15 minutos, e concentração palha/água entre 10 e 15%). A melhor condição encontrada no tratamento hidrotérmico foi a 190 °C, 18 minutos e 12,5% de relação palha/água.…”

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Otimização de parâmetros operacionais do pré-tratamento da palha de cana-de-açúcar

et al. 2017

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O compromisso de atender as necessidades do presente sem comprometer a possibilidade de suprir as necessidades das gerações futuras, torna a diversificação da matriz energética brasileira e mundial fator cada vez mais compulsório. Diante disso, o uso de biomassas lignocelulósicas para obtenção de combustíveis mais limpos do ponto de vista ambiental é amplamente discutido na atualidade. O etanol combustível pode ser obtido a partir de fontes alternativas de energia, como as biomassas lignocelulósicas. Esse tipo de matéria-prima possui elevado teor de açúcares fermentescíveis em sua composição. Porém, esses não se encontram diretamente disponíveis, sendo necessárias etapas adicionais para sua obtenção. Este trabalho teve como objetivo a otimização da etapa de pré-tratamento da palha de cana-de-açúcar, por meio de um delineamento experimental 2 2 com três repetições no ponto central. As variáveis de estudo foram: a razão palha/água (m/v) na etapa de pré-tratamento hidrotérmico e a temperatura reacional do pré-tratamento alcalino sequencial ao hidrotérmico. O estudo mostrou que a deslignificação não promoveu melhora significativa na conversão da celulose em glicose na hidrólise enzimática, o que não justifica a realização dessa etapa adicional, nas condições avaliadas. Já o pré-tratamento hidrotérmico apresentou bons resultados, alcançando na etapa de hidrólise conversões superiores a 85%, em especial para as razões palha/água 1:6,7 e 1:20 (m/v).Palavras-chave: palha de cana-de-açúcar, otimização, pré-tratamento sequencial, pré-tratamento hidrotérmico, bioetanolThe commitment to meeting the needs of the present without compromising the ability to meet the needs of future generations makes the diversification of the Brazilian and the global energy matrix a compulsory factor. Thus, the use of lignocellulosic biomass to obtain cleaner fuels from an environmental point of view is widely discussed today. Fuel ethanol has been obtained from alternative energy sources, as lignocellulosic biomass. This type of biomass has high content of fermentable sugars. However, these sugars were not directly available, which need to include additional steps in the process to achieve this goal. This study aims to carry out an operational parameters optimization in the sugarcane straw pretreatment through a 2 2 experimental design with three replications at the central point. The study variables were: straw-water ratio (m/v) in the hydrothermal pretreatment and the temperature reaction in the alkaline pretreatment, sequential to hydrothermal. The study reveals that the delignification did not promote significant improvements in glucose conversion during the enzymatic hydrolysis. Thus, this addition step was not justified, under the evaluated conditions. Furthermore, the hydrothermal pretreatment showed good results reaching conversions higher than 85% in the hydrolysis step, in particular for the straw-water ratios 1:6.7 and 1:20 (m/v).

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Otimização do pré-tratamento hidrotérmico da palha de cana-de-açúcar visando à produção de etanol celulósico

Cited by 37 publications

References 7 publications

Feasibility of Ethanol Production Using the Whole Sugarcane Biomass

Feasibility of Ethanol Production Using the Whole Sugarcane Biomass

Wheat yield obtained from nitrogen dose and fractionation

Otimização de parâmetros operacionais do pré-tratamento da palha de cana-de-açúcar

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