{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T15:10:11Z","timestamp":1784128211769,"version":"3.55.0"},"reference-count":53,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T00:00:00Z","timestamp":1781654400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T00:00:00Z","timestamp":1781654400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["ChemSusChem"],"published-print":{"date-parts":[[2026,6,26]]},"abstract":"<jats:p>Ionic liquids (ILs) enable efficient lignin extraction in the Ionosolv process, but their sustainable implementation requires effective lignin recovery from IL extract to allow IL recycling. Conventional water\u2010based precipitation of lignin is energy intensive due to the high enthalpy of vaporization of water. In this work, we propose a \u03b3\u2010valerolactone (GVL)\u2010based aqueous two\u2010phase system (ATPS) as a more energy\u2010efficient separation strategy. The phase behavior of the ternary ATPS water + GVL\u2009+\u2009monoethanolammonium acetate ([MEA][OAc]) was experimentally determined and correlated using the thermodynamic non\u2010random two\u2010liquid model. Then, lignin was extracted from Eucalyptus wood using the IL [MEA][OAc]. Application of this ATPS to the Ionosolv liquor enabled selective partitioning of lignin into the GVL\u2010rich phase, followed by its isolation using low\u2010enthalpy organic antisolvents (acetone, tert\u2010butanol, 2\u2010propanol, or 1\u2010butanol). The GVL\u2010rich phases were examined for suspended lignin particles. Structural characterization by 2D\u2010NMR confirmed precipitated lignins exhibit high syringyl content and low degrees of recondensation, resulting in materials with enhanced depolymerizability. These findings show that GVL\u2010based ATPSs are a promising lower\u2010energy downstream option for lignin recovery from Ionosolv liquors. Relative to conventional water precipitation, the proposed route lowers solvent\u2010regeneration energy demand by up to 44% while preserving favorable lignin structural features.<\/jats:p>","DOI":"10.1002\/cssc.70776","type":"journal-article","created":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T15:25:59Z","timestamp":1781709959000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Recovery of Monoethanolammonium Acetate from Ionosolv Liquors Using a \u03b3\u2013Valerolactone\u2013Based Aqueous Two\u2013Phase System"],"prefix":"10.1002","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-5456-5392","authenticated-orcid":false,"given":"Sara","family":"Villarino","sequence":"first","affiliation":[{"name":"Department of Chemical and Materials Engineering Complutense University of Madrid  Madrid 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