Fractional Precipitation of Softwood Kraft Lignin: Isolation of Narrow Fractions Common to a Variety of Lignins

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Aqueous organic solvent fractionation as means to improve lignin homogeneity and purity (2017, background): “On the other hand, this result does not agree with other fractionation studies, in which low molar mass lignin fractions have been found to possess less aliphatic hydroxyl groups than lignin with higher molar mass (Cui et al., 2014; Sadeghifar et al., 2017) .”
Solvent screening for the fractionation of industrial kraft lignin (2015, background): “with different solvents including hexane (Wang et al. 2010; Cui et al. 2014), diethyl ether (Vanderlaan and Thring 1998; Yuan et al.”
Perspective on Technical Lignin Fractionation (2020, unknown): “Three softwood Kraft lignin were fractionation using acetone and hexane solution to yield separate different fraction 75 .”
Recent innovations in analytical methods for the qualitative and quantitative assessment of lignin (2015, methodology): “Another powerful technique utilized in measuring total lignin content is NMR [80,140,146,152,169,287,288].”