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http://hdl.handle.net/10400.9/3124
Título: | Biorefinery approach for lignocellulosic biomass valorisation with an acidic ionic liquid |
Autor: | Lopes, André Lins, Roberto M. G. Rebelo, Ricardo A. Lukasik, Rafal M. |
Palavras-chave: | Biorefinery Lignocellulosic biomass Valorisation Ionic liquids |
Data: | 2018 |
Editora: | Royal Society of Chemistry |
Citação: | Lopes, A.M. da Costa... [et.al.] - Biorefinery approach for lignocellulosic biomass valorisation with an acidic ionic liquid. In: Green Chemistry, 2018, Vol. 20, p. 4043-4047 |
Resumo: | ABSTRACT: The commercialisation of the biorefinery approach involving the integration of the multi-step valorisation of low value biomass feedstock into a variety of chemicals, fuels and bioproducts is still very limited. In this context, the present work proposes an advanced methodology that comprises a cascaded approach towards wheat straw valorisation. The studied concept lies in the employment of an aqueous solution of the acidic 1-ethyl-3-methylimidazolium hydrogen sulfate ionic liquid in a selective and efficient hydrolysis of the hemicellulose fraction of wheat straw into pentoses, namely xylose and arabinose. An experimental design was utilised to search for the optimisation parameters, resulting in a maximum 80.5 wt% pentose yield in the liquor. Furthermore, the remaining solid, which contained practically all of the initial cellulose and lignin, was processed by considering two scenarios: (i) a direct enzymatic hydrolysis of the reaction solid, which yielded 75.8 mol% glucose; or (ii) a preceding extraction of lignin followed by enzymatic saccharification of the cellulose pulp, which yielded 91.3 mol% glucose. For both scenarios, lignin-rich solid fractions were obtained with distinct purities and yields. Additionally, the second scenario allowed producing a stream of value-added aromatic (phenolic) compounds. This work also overcame the challenges in IL recycling and reuse, with a simultaneous recovery of the pentoses from the reaction liquor as high as 88.6 mol%. |
Peer review: | yes |
URI: | http://hdl.handle.net/10400.9/3124 |
ISSN: | 1463-9262 |
Versão do Editor: | https://doi.org/10.1039/c8gc01763h |
Aparece nas colecções: | UB - Artigos em revistas internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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GreenChemistry_Vol.20_4043.pdf | 116,45 kB | Adobe PDF | Ver/Abrir |
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