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Quantitative insights on de/repolymerization and deoxygenation of lignin in subcritical water

AL. LaVallie, H. Bilek, A. Andrianova, K. Furey, K. Voeller, B. Yao, E. Kozliak, A. Kubátová

. 2021 ; 342 (-) : 125974. [pub] 20210920

Jazyk angličtina Země Velká Británie

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc22003057

The objective of the study was to investigate alkali lignin polymerization/depolymerization pathways in subcritical water (SW) without additives. Following a SW treatment at 200, 250, 275 and 300 °C, the products were subjected to a comprehensive suite of analyses addressing the product speciation and molecular weight (MW) distribution. The MW reduction (1.4 times) in the solid products following the SW treatment indicated a surprisingly reduced impact of cross-linking/repolymerization at 300 °C and lower temperatures. This was further confirmed by thermal carbon analysis (TCA) showing a reduction in pyrolytic charring after the SW treatment. The TD-Py gas chromatography analysis of the SW treated lignin indicated that the solid residue is less oxygenated than the initial lignin (23 vs. 29% as confirmed by elemental analysis). Thus, deoxygenation rather than re-polymerization appears to be the main process route in the absence of catalysts within the temperature range considered.

Citace poskytuje Crossref.org

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$a The objective of the study was to investigate alkali lignin polymerization/depolymerization pathways in subcritical water (SW) without additives. Following a SW treatment at 200, 250, 275 and 300 °C, the products were subjected to a comprehensive suite of analyses addressing the product speciation and molecular weight (MW) distribution. The MW reduction (1.4 times) in the solid products following the SW treatment indicated a surprisingly reduced impact of cross-linking/repolymerization at 300 °C and lower temperatures. This was further confirmed by thermal carbon analysis (TCA) showing a reduction in pyrolytic charring after the SW treatment. The TD-Py gas chromatography analysis of the SW treated lignin indicated that the solid residue is less oxygenated than the initial lignin (23 vs. 29% as confirmed by elemental analysis). Thus, deoxygenation rather than re-polymerization appears to be the main process route in the absence of catalysts within the temperature range considered.
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$a Andrianova, Anastasia $u Department of Chemistry, University of North Dakota, 151 Cornell St. Grand Forks, ND 58202, USA; Agilent Technologies, Inc. 2850 Centerville Rd, Wilmington, DE 19808-1610, USA
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$a Voeller, Keith $u Department of Chemistry, University of North Dakota, 151 Cornell St. Grand Forks, ND 58202, USA; Sciex, Minneapolis, MN 58203, USA
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