2026-06-28T15:19:59Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/1302712026-01-16T00:47:15Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author García González, Julián author Rigual Hernández, Victoria de los Ángeles author Rodríguez Somolinos, Francisco author Villarino, Sara author García Sánchez, Beatriz 2026-01-15T07:45:19Z 2026-01-15T07:45:19Z 2025-08 Sara Villarino, Victoria Rigual, Beatriz García-Sánchez, Francisco Rodríguez, Julián García, Selective precipitation of ionosolv lignins: Replacing water with low enthalpy of vaporization antisolvents, Industrial Crops and Products, Volume 230, 2025, 121123. https://doi.org/10.1016/j.indcrop.2025.121123. 0926-6690 10.1016/j.indcrop.2025.121123 https://hdl.handle.net/20.500.14352/130271 https://doi.org/10.1016/j.indcrop.2025.121123 https://www.sciencedirect.com/science/article/pii/S0926669025006697 Ionic liquids (ILs) have shown promising results in the extraction of lignin in biorefineries using the Ionosolv process. Isolating lignin from the IL-lignin solution to enable IL recycling is a critical step for the viability of this technology. The use of water as a lignin antisolvent is a well-established practice. However, the subsequent distillation of the antisolvent inevitably results in considerable energy expenditure due to the high enthalpy of vaporization of water. In this context, the substitution of water by solvents with low enthalpy of vaporization has been investigated. Lignin was extracted from eucalyptus wood using the IL 2-hydroxyethylammonium acetate or monoethanolammonium acetate ([MEA][OAc]). Alternative antisolvents tert-butanol, 2-propanol, and 1-butanol were tested for lignin precipitation and their energy recovery cost, was calculated and compared with the base case (water as antisolvent). The recovered lignins were characterized by a combination of techniques, including gel permeation chromatography (GPC), two-dimensional nuclear magnetic resonance (2D‐NMR),and thermogravimetric analysis (TGA), with the objective of elucidating the extracted lignin chemical structure and thermal stability. Lignins precipitated with alcohols had higher average molecular weights and lower polydispersity indexes compared to those precipitated with water. Furthermore, lignins precipitated with alcohols exhibited remarkable thermal stability at high temperatures and were characterised by an abundance of β-O-4’ linkages and S units. Consequently, this work proposes an alternative approach to the separation of ionosolv lignins from ILs with lower associated energy consumptions, while simultaneously delivering lignins with enhanced characteristics in comparison to the conventionally accepted Ionosolv process. eng Attribution 4.0 International Selective precipitation of ionosolv lignins: Replacing water with low enthalpy of vaporization antisolvents journal article 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URL https://docta.ucm.es/bitstreams/278058a6-9975-4fb3-92e2-2234b95dfe72/download File MD5 f63560992672b858e838696832e6fd6c 3249587 application/pdf Ionsolv_Lignin_Precipitation.pdf