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Probing the molecular weights of sweetgum and pine kraft lignin fractions, TAPPI Journal June 2021
ABSTRACT: The present investigation undertook a systematic investigation of the molecular weight (MW) of kraft lignins throughout the pulping process to establish a correlation between MW and lignin recovery at different extents of the kraft pulping process. The evaluation of MW is crucial for lignin characterization and utilization, since it is known to influence the kinetics of lignin reactivity and its resultant physico-chemical properties. Sweetgum and pine lignins precipitated from black liquor at different pHs (9.5 and 2.5) and different extents of kraft pulping (30•150 min) were the subject of this effort. Gel permeation chromatography (GPC) was used to determine the number average molecular weight (Mn), mass average molecular weight (Mw), and polydispersity of the lignin samples. It was shown that the MW of lignins from both feedstocks follow gel degradation theory; that is, at the onset of the kraft pulping process low molecular weight-lignins were obtained, and as pulping progressed, the molecular weight peaked and subsequently decreased. An important finding was that acetobromination was shown to be a more effective derivatization technique for carbohydrates containing lignins than acetylation, the technique typically used for derivatization of lignin.
Conference papers
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Conference papers
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Conference papers
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Conference papers
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Conference papers
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Conference papers
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Conference papers
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Enhancement of Eucalypt Pulp Yield through Extended Impregnation Cooking, 2016 PEERS
Conference papers
Advanced Atline Kappa measurements with NIR-Spectroscopy for
Advanced Atline Kappa measurements with NIR-Spectroscopy for Fiberline Optimization, 2016 PEERS
Conference papers
How Old are Fibers in Paper for Recycling and What is their
How Old are Fibers in Paper for Recycling and What is their Life Expectancy?, 2016 PEERS