Molar mass-dependent profiles of functional groups and carbohydrates in kraft lignin |
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Authors: | Grigory Zinovyev Ivan Sumerskii Philipp Korntner Irina Sulaeva Thomas Rosenau |
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Affiliation: | Division of Chemistry of Renewable Resources and Christian-Doppler Laboratory “Advanced Cellulose Chemistry and Analytics”, Department of Chemistry, University of Natural Resources and Life Sciences, Vienna, Tulln, Austria |
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Abstract: | Technical lignins are complex, irregular, polyphenolic compounds obtained in large quantities as by-products of the pulp and paper industries or according to current biorefinery setups. The availability of kraft lignin is increasing due to larger scale retrieval from process liquors, which opens new possibilities for further refining or new applications of such lignins. In the present study, sequential ultrafiltration of kraft lignin was performed to fractionate the lignin and to elucidate molar mass-dependent changes in lignin structure. Two industrial black liquors and three precipitated lignins were fractionated, and their functional groups were determined, providing molar mass-dependent profiles. Interrelations between structural parameters and functional groups, the molecular weight ranges, and the different lignin sources are discussed. This will help to establish structure-property-application relationships (SPARs) for technical lignins which are required for any future large-scale application. |
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Keywords: | Kraft lignin technical lignins, fractionation molar mass distribution functional groups |
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