Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2337
Título: Novel pre-treatment and fractionation method for lignocellulosic biomass using ionic liquids
Autor: Silva, Sara P. Magalhães da
Lopes, André
Roseiro, Luísa
Bogel-Lukasik, R.
Palavras-chave: Pre-treatment
Fractionation
Lignocellulosic Biomass
Ionic Liquids
Data: 2013
Editora: The Royal Soiety of Chemistry
Citação: Silva, Sara P.M. da; Lopes, André M. da Costa, Roseiro, Luisa B.; Bogel-Lukasik, R. Novel pre-treatment and fractionation method for lignocellulosic biomass using ionic liquids. In: RSC Advances, 2013, Vol. 3, p. 16040-16050
Resumo: An efficient lignocellulosic biomass pre-treatment is a crucial step for the valorization of these kind of raw materials. Lignocellulosic biomass is a potentially valuable resource for transformation into biofuels and bio-based products. The use of ionic liquids as media for the biomass pre-treatment is an alternative method that follows the green chemistry concept. This work proposes a new methodology for wheat straw pre-treatment with the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([emim][OAc]), which allowed the production of cellulose, hemicellulose and lignin-rich fractions in a rapid and simple three-step fractionation process. Various temperatures (80–140 uC) and processing times (2–18 h) of the pretreatment were studied. The quantitative and qualitative analysis of each lignocellulosic biomass fraction was determined by FTIR measurements. The glucan content in recovered cellulose-rich fractions was investigated by enzymatic hydrolysis. The cellulose recovery dependence on the pre-treatment conditions was ascertained through regression analysis. The optimal result for the recovery of the cellulose-rich fraction was obtained at 140 uC during 6 h achieving 37.1% (w/w) of the initial biomass loading. For the same conditions, optimal results were also produced regarding the amount of glucan present (81.1% w/wbiomass) in cellulose-rich fractions, the carbohydrate enrichment in the hemicellulose fraction (96% wt) and the purity of lignin (97% wt). The recovery of IL was performed after each pre-treatment and the obtained yields were up to 86% (w/w). The recovered ILs were analyzed by 13C and 1H NMR. The presence of value-added phenolic compounds in the recovered ILs was analyzed by capillary electrophoresis. Vanillin and its derivatives, as well as other lignin-based products, were identified.
URI: http://hdl.handle.net/10400.9/2337
ISSN: 2046-2069
Versão do Editor: http://dx.doi.org/10.1039/C3RA43091J
Aparece nas colecções:UB - Artigos em revistas internacionais

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