Hydrotropy and Cosolvency in Lignin Solubilization with Deep Eutectic Solvents
authors Soares, B; Silvestre, AJD; Pinto, PCR; Freire, CSR; Coutinho, JAP
nationality International
journal ACS SUSTAINABLE CHEMISTRY & ENGINEERING
author keywords Deep eutectic solvents; Solubility; Hydrotropy; Cosolvency; Lignin monomer model compounds; Technical lignins; Biorefinery
keywords AQUEOUS-SOLUTIONS; FRACTIONATION; CELLULOSE; WOOD; PRETREATMENT; CHALLENGES; DES
abstract The mechanisms responsible for the good solubility of lignin in aqueous solutions of deep eutectic solvents are here investigated using both monomer model compounds and technical lignins (kraft and organosolv). The results show the ability of deep eutectic solvents to act either as hydrotropes or cosolvents, enhancing the solubility of poorly soluble solutes (technical lignins or their monomers). Hydrotropy was shown to lead to a remarkable enhancement of organosolv lignin solubility of 474.7 +/- 2.7 times using an aqueous solution of propionic acid:urea (2:1), while for the systems where the solubilization mechanism was cosolvency, the best solubility enhancement was 194.2 +/- 4.1 times using ethylene glycol:tetrabutylphosphonium chloride (2:1). The solubility of kraft lignin was also enhanced using an aqueous solution of propionic acid:urea (2:1) (228.3 +/- 8.2 times) and ethylene glycol:tetraethylammonium chloride (2:1) (163.0 +/- 16.1 times) by the same mechanisms.
publisher AMER CHEMICAL SOC
issn 2168-0485
year published 2019
volume 7
issue 14
beginning page 12485
ending page 12493
digital object identifier (doi) 10.1021/acssuschemeng.9b02109
web of science category Chemistry, Multidisciplinary; Green & Sustainable Science & Technology; Engineering, Chemical
subject category Chemistry; Science & Technology - Other Topics; Engineering
unique article identifier WOS:000475838100059
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