Effect of Protic Ionic Liquids in Sugar Cane Bagasse Pretreatment for Lignin Valorization and Ethanol Production

Pin, Thaynara C.; Rabelo, Sarita C.; Pu, Yunqiao Joseph; Ragauskas, Arthur J.; Costa, Aline C.

doi:10.1021/acssuschemeng.1c05353

Title: Effect of Protic Ionic Liquids in Sugar Cane Bagasse Pretreatment for Lignin Valorization and Ethanol Production

Journal Article · Tue Nov 09 00:00:00 EST 2021 · ACS Sustainable Chemistry & Engineering

DOI:https://doi.org/10.1021/acssuschemeng.1c05353· OSTI ID:1843672

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Univ. of Campinas (UNICAMP), Sao Paulo (Brazil); Univ. of Tennessee, Knoxville, TN (United States)
São Paulo State University (UNESP), São Paulo (Brazil)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)

Ionic liquids have been called designer solvents because it is possible to fine-tune their properties from a huge range of possible combinations of cations and anions. In this work, we evaluate the potential of protic ionic liquids (PILs) in the fractionation of sugar cane bagasse in a biorefinery context. Here, the PILs were designed to selectively solubilize lignin and leave a polysaccharides solid fraction. The carbohydrate fraction was further hydrolyzed to obtain pentose and hexose sugars, which were fermented using a pentose-consuming yeast. The results have shown that, differently from pretreatments that solubilize hemicelluloses, pentoses could be fermented together with hexoses without a prior detoxification step with high yield and productivity. The lignin recovered was characterized by 2D HSQC NMR, ³¹P NMR, and GPC, showing that the design of the PIL influences lignin characteristics, but pretreatment temperature and time do not. The lignins obtained are sulfur-free, and the richness of their functional groups makes them attractive for conversion into a diversity of value-added products, which can make a biorefinery based on the proposed process viable.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Council for Scientific and Technological Development (CNPq); São Paulo Research Foundation (FAPESP)

Grant/Contract Number:: AC05-00OR22725; 141393/2018-1; 204710/2018-9; 304944/2018-1; 2015/20630-4

OSTI ID:: 1843672

Journal Information:: ACS Sustainable Chemistry & Engineering, Vol. 9, Issue 50; ISSN 2168-0485

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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