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However, the inherent heterogeneity of lignin poses a significant obstacle to achieving efficient conversion and optimal product yields within bio\u2010refinery systems. Herein, we employed a one\u2010step fractionation method to enhance lignin homogeneity and utilized the THF\/DMSO\u2010EtONa (tetrahydrofuran\/dimethyl sulfoxide\u2010sodium ethoxide) system to depolymerize the fractionated lignin. Three protic and three aprotic solvents were used for fractionation. The impact of the solvent properties on the structure and the depolymerization efficiency of the fractionated lignin was investigated. Methanol\u2010fractionated lignin generated the benzoic acid compounds with a yield of 30\u2005wt%, 50\u2009% higher than that of the unfractionated lignin. The polarities (\n                    <jats:bold>\n                      \u03b4\n                      <jats:sub>P<\/jats:sub>\n                    <\/jats:bold>\n                    ), hydrogen bonding abilities (\n                    <jats:bold>\n                      \u03b4\n                      <jats:sub>H<\/jats:sub>\n                    <\/jats:bold>\n                    ), and viscosities (\n                    <jats:bold>\u03b7<\/jats:bold>\n                    ) of selected protic solvents showed strong linear correlation with molecular weight (Mw), polymer dispersity index (PDI), and syringyl\/guaiacyl ratio (S\/G ratio) of the fractionated lignin, as well as the total yield of benzoic acid compounds derived from the \u03b2\u2010O\u20104 bond cleavage. This study elucidates the relationship between solvent properties and lignin structure and proposes a promising approach for refining lignin to enhance utilization efficiency, thereby presenting a potential strategy for value\u2010added application of complex lignin polymers.\n                  <\/jats:p>","DOI":"10.1002\/cssc.202400378","type":"journal-article","created":{"date-parts":[[2024,4,4]],"date-time":"2024-04-04T00:34:40Z","timestamp":1712190880000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Improving the Monophenolic Yield of Lignin Depolymerization in Dualistic Aprotic Solvent System by Organic Solvent Fractionation"],"prefix":"10.1002","volume":"17","author":[{"given":"Yan","family":"Xu","sequence":"first","affiliation":[{"name":"School of Light Industry and Engineering South China University of Technology  Guangzhou 510640 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