Avaliar a geração de furfural na rota de produção do etanol proveniente do eucalipto
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Data
2021-08-26
Autores
Oliveira, Iliane Rodrigues de
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Universidade Estadual Paulista (Unesp)
Resumo
Na busca pelo total aproveitamento da biomassa e sua energia, a biorrefinaria permite a separação de hemiceluloses da biomassa lignocelulósica e fabricação de produtos de alto valor agregado. Compostos importantes, como o furfural, podem ser obtidos durante a etapa de pré-tratamento da madeira. Considerando o rendimento de remoção de hemiceluloses através do uso de auto-hidrólise, a integração da produção de furfural ao processo produtivo do bioetanol a partir da madeira de eucalipto, objeto desse estudo, se mostra interessante. Para tanto, foram utilizados cavacos de Eucalyptus grandis x Eucalyptus urophylla provenientes da região de Itapeva-SP. Antes da auto-hidrólise foi realizada a caracterização dos cavacos. A auto-hidrólise foi realizada nas temperaturas de 160, 165 e 170ºC, com tempos de 15, 30 e 45 min. Para a quantificação de furfural foram utilizados dois métodos: análise HPLC (High Performance Liquid Chromatography) e o método volumétrico brometo-bromato. Com base nos resultados obtidos da análise HPLC foi verificado que a relação entre tempo e temperatura que se mostra mais vantajosa, para remoção de hemicelulose e consequente produção de furfural foi 170ºC com 45 min, devido ao observando aumento de 55,9% na remoção de xilose com acréscimo de 5ºC na temperatura (165 para 170ºC), e somente 14,3% na remoção de glicose, nas mesmas condições. Havendo a possibilidade de aumento dessa temperatura de pré-tratamento para trabalhos futuros. Os resultados indicaram que o método volumétrico se mostrou inadequado para a determinação do teor de furfural no licor da auto-hidrólise utilizado sob tais condições, devido à grande variação apresentada entre os resultados.
Biorefinery allows separation of hemicelluloses from lignocellulosic biomass and manufacture of products with high added value. In this context, considering the yields of removing hemicelluloses through use of auto-hydrolysis, in addition to environmental and economic advantages, coupled with the fact that important compounds such as furfural can be obtained during pre-treatment stage, the integration of furfural production the processing of bioethanol from eucalyptus wood, the object of this study, is interesting. For this purpose, Eucalyptus grandis x Eucalyptus urophylla chips from the region of Itapeva-SP were used. The characterization of chips was carried out before the auto-hydrolysis process. Autohydrolysis was performed at temperatures of 160, 165 and 170ºC, with times of 15, 30 and 45 min. For furfural quantification, bromide-bromate volumetric method and HPLC (High Performance Liquid Chromatography) analysis were used. Based on the results obtained from the HPLC analysis, it was verified that the relationship between time and temperature that is most advantageous for the removal of hemicellulose and consequent production of furfural was 170ºC with 45 min, because of the increase of 55.9% in the removal of xylose with an rise of 5ºC in the temperature (165 to 170ºC) observed, and only 14.3% in the removal of glucose, under the same conditions. With the possibility of increasing this pre-treatment temperature for future works. The results indicated that the bromide-bromate volumetric method is proved to be inadequate for determination of furfural content in autohydrolysis liquor used under such conditions, due to great variation presented between the results
Biorefinery allows separation of hemicelluloses from lignocellulosic biomass and manufacture of products with high added value. In this context, considering the yields of removing hemicelluloses through use of auto-hydrolysis, in addition to environmental and economic advantages, coupled with the fact that important compounds such as furfural can be obtained during pre-treatment stage, the integration of furfural production the processing of bioethanol from eucalyptus wood, the object of this study, is interesting. For this purpose, Eucalyptus grandis x Eucalyptus urophylla chips from the region of Itapeva-SP were used. The characterization of chips was carried out before the auto-hydrolysis process. Autohydrolysis was performed at temperatures of 160, 165 and 170ºC, with times of 15, 30 and 45 min. For furfural quantification, bromide-bromate volumetric method and HPLC (High Performance Liquid Chromatography) analysis were used. Based on the results obtained from the HPLC analysis, it was verified that the relationship between time and temperature that is most advantageous for the removal of hemicellulose and consequent production of furfural was 170ºC with 45 min, because of the increase of 55.9% in the removal of xylose with an rise of 5ºC in the temperature (165 to 170ºC) observed, and only 14.3% in the removal of glucose, under the same conditions. With the possibility of increasing this pre-treatment temperature for future works. The results indicated that the bromide-bromate volumetric method is proved to be inadequate for determination of furfural content in autohydrolysis liquor used under such conditions, due to great variation presented between the results
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Palavras-chave
Auto-hidrólise, Biorrefinaria, Etanol, Furfural, Hemiceluloses, Biorefinery, Ethanol, Hemicelluloses, Auto-hydrolysis, Furfural, Eucalipto