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Article

Formosolv Pretreatment to Fractionate Paulownia Wood Following a Biorefinery Approach: Isolation and Characterization of the Lignin Fraction

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Technological Centre of Multisectorial Research (CETIM), Business Park of Alvedro, 15181 Culleredo, Spain
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Department of Chemical Engineering, Faculty of Science, Universidade de Vigo (Campus Ourense), As Lagoas, 32004 Ourense, Spain
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Environmental Technology and Assessment Laboratory, Campus da Auga-Campus Ourense, Universidade de Vigo, 32004 Ourense, Spain
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Center of Biological Engineering, University of Minho, Campus of Gualtar, 4710 057 Braga, Portugal
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Group of Environmental Chemical Engineering (EnQA), Centro de Investigacións Científicas Avanzadas (CICA), Dept. of Chemistry, Faculty of Science, Univerdade da Coruña, As Carballeiras, s/n, 15071 A Coruña, Spain
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(8), 1205; https://doi.org/10.3390/agronomy10081205
Received: 28 July 2020 / Revised: 13 August 2020 / Accepted: 13 August 2020 / Published: 17 August 2020
(This article belongs to the Special Issue Pretreatment and Bioconversion of Crop Residues)
Paulownia is a rapid-growth tree with a high biomass production rate per year and low demand of water, which make it very suitable for intercropping systems, as it protects the crops from adverse climatic conditions, benefiting the harvest yields. Moreover, these characteristics make Paulownia a suitable raw material able to be fractionated in an integrated biorefinery scheme to obtain multiple products using a cascade conversion approach. Different delignification pretreatments of biomass have been purposed as a first stage of a lignocellulosic biorefinery. In this study, the formosolv delignification of Paulownia wood was investigated using a second order face-centered factorial design to assess the effects of the independent variables (concentrations of formic and hydrochloric acids and reaction time) on the fractionation of Paulownia wood. The maximum delignification achieved in this study (78.5%) was obtained under following conditions: 60 min, and 95% and 0.05% formic and hydrochloric acid, respectively. In addition, the remained solid phases were analyzed to determine their cellulose content and cooking liquors were also chemically analyzed and characterized. Finally, the recovered lignin by precipitation from formosolv liquor and the pristine lignin (milled wood lignin) in Paulownia wood were characterized and compared by the following techniques FTIR, NMR, high-performance size-exclusion chromatography (HPSEC) and TGA. This complete characterization allowed verifying the capacity of the formosolv process to act on the lignin, causing changes in its structure, which included both phenomena of depolymerization and condensation. View Full-Text
Keywords: organosolv; fractionation; lignin; characterization; Paulownia organosolv; fractionation; lignin; characterization; Paulownia
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MDPI and ACS Style

Domínguez, E.; del Río, P.G.; Romaní, A.; Garrote, G.; Gullón, P.; de Vega, A. Formosolv Pretreatment to Fractionate Paulownia Wood Following a Biorefinery Approach: Isolation and Characterization of the Lignin Fraction. Agronomy 2020, 10, 1205. https://doi.org/10.3390/agronomy10081205

AMA Style

Domínguez E, del Río PG, Romaní A, Garrote G, Gullón P, de Vega A. Formosolv Pretreatment to Fractionate Paulownia Wood Following a Biorefinery Approach: Isolation and Characterization of the Lignin Fraction. Agronomy. 2020; 10(8):1205. https://doi.org/10.3390/agronomy10081205

Chicago/Turabian Style

Domínguez, Elena; del Río, Pablo G.; Romaní, Aloia; Garrote, Gil; Gullón, Patricia; de Vega, Alberto. 2020. "Formosolv Pretreatment to Fractionate Paulownia Wood Following a Biorefinery Approach: Isolation and Characterization of the Lignin Fraction" Agronomy 10, no. 8: 1205. https://doi.org/10.3390/agronomy10081205

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