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Alkaline Pretreatment Severity Leads to Different Lignin Applications in Sugar Cane Biorefineries

Autorde Menezes, Fabrícia F.; Rencoret, Jorge ; Nakanishi, Simone C.; Nascimento, Viviane M.; da Silva, Vinicius F. N.; Gutiérrez Suárez, Ana ; Río Andrade, José Carlos del ; de Moraes Rocha, George J.
Palabras claveSugar cane industry
Pretreatment
Alkaline-lignins
Chemical features
Biorefinery
Fecha de publicaciónjul-2017
EditorAmerican Chemical Society
CitaciónACS Sustainable Chemistry and Engineering 5(7): 5702-5712 (2017)
ResumenLignin, a multifunctional major biomass component, has a prominent potential as feedstock to be converted into high value-added products. Lignin is available in high amounts as side streams during cellulosic ethanol production, and within the biorefinery context, it is important to assess its structural characteristics in order to explore its potential to replace some petroleum-based reactants. In this study, some important features were evaluated for different lignins such as lignin purity and the amounts of syringyl (s), guaiacyl (G), and p-hydroxyphenyl (H) units. Four alkaline lignins, generated from a pilot-scale pretreatment of sugar cane bagasse (NaOH 1.5%, 30 min), were evaluated according to the severity of the alkaline pretreatment (130 or 170 degrees C, with or without the addition of anthraquinone). The different pretreatments produced lignins with different chemical characteristics that can be used for different purposes in sugar cane biorefineries. As the severity of alkaline pretreatment increased, the recovered lignins presented higher amounts of H- and lower amounts of S-lignin units. In particular, the lignin obtained at 170 degrees C with the addition of anthraquinone presented the highest content of H- and the lowest content of S-lignin units, which would present higher reactivity toward formaldehyde in phenolic resins.
Descripción11 páginas.-- 5 figuras.-- 6 tablas.-- 27 referencias.--
Versión del editorhttp://dx.doi.org/10.1021/acssuschemeng.7b00265
URIhttp://hdl.handle.net/10261/153597
DOI10.1021/acssuschemeng.7b00265
ISSN2168-0485
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