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Assessment of deep eutectic solvents (DES) to fractionate paulownia wood within a biorefinery scheme: cellulosic bioethanol production and lignin isolation

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posted on 2024-06-10, 10:47 authored by Fernando Rodríguez-Rebelo, Beatriz Rodríguez-Martínez, Pablo Del-RíoPablo Del-Río, Maurice CollinsMaurice Collins, Gil Garrote, Beatriz Gullón

Five deep eutectic solvents (DES) were evaluated to disrupt Paulownia wood structure to produce bioethanol and lignin. The DES formulated with choline chloride:lactic acid provided the most promising result. Temperature (110–130 ◦C), residence time (30–120 min), molar ratio (1:2–1:9), and liquid-to-solid ratio (8–15 mL/g) were optimized for cellulose recuperation (93% retained in the solid phase) and lignin removal (94% delignification yield). The spent solid was used for bioethanol production, achieving up to 43.6 g ethanol/L (89.7% ethanol yield). Lignin (84% of purity) was isolated from the black liquor and thoroughly characterized by FTIR, 1 H NMR, TGA-DTG and SEM, while the liquor after lignin precipitation was chemically characterized for monomers/ oligomers, total phenolic content, antioxidant activity and phytochemical profile (highlighting the presence of 25.06, 10.21 and 2.51 mg of syringaldehyde, vanillin and 3,4-dihydroxibenzoic acid per g of initial biomass). Overall, this study show that DES pre-treatment is a promising strategy for simultaneous lignin extraction and cellulose digestibility enhancement.

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Publication

Industrial Crops & Products 216, 118761

Publisher

Elsevier

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  • Bernal Institute
  • Stokes Research Institute

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  • School of Engineering

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