Properties and Potential Utilization of Industrial Eucalyptus Soda/Anthraquinone Lignin - Part I. Isolation, Identification and Origin of the Low Molecular Mass Lignin Fragments Present in an Industrial Soda/Anthraquinone Spent Pulping Liquor

Molecular Characteristics of Kraft-AQ Pulping Lignin Fractionated by Sequential Organic Solvent Extraction

“…Data shows the S/G value gradually decreased with increasing fraction number from 1.58/1 in F 1 to 1.40/1 in F 5 . Similar trends were also found in the study of lignin fractions obtained by the separation with organic solvents [ 15 – 17 ], but contradicted the results obtained by Thring et al . [ 18 ] in the study of ALCELL ® lignin.…”

Characterization of fractional cuts of co-solvent enhanced lignocellulosic fractionation lignin isolated by sequential precipitation

“…In terms of the relationship between molecular weight and lignin subunits, no clear correlation between S/G ratio or PB content and molecular weight was obtained in this study. A few studies have reported that S/G ratio of lignin fractions gradually decreased with increased molecular weight due to the fact that guaiacyl compounds had a reactive site on the phenyl ring to participate in the condensation reactions, forming higher molecular weight fragments (Moerck et al, 1988;Moerck et al, 1986;Van der Klashorst and Strauss, 1987). However, Park et al also reported that there was no noticeable trend for S/G ratios between lignin fractions obtained by sequential organic solvents extraction of organosolv lignin and milled wood lignin (Park et al, 2018).…”

Properties and Potential Utilization of Industrial Eucalyptus Soda/Anthraquinone Lignin Part II. Properties of the Purified Lignin

“…The purified lignin comprised more than half of the total lignin content of the spent liquor. The portion lost during the exstensive purification of the lignin could contain proportionally more dimethoxy structures owing to the greater ease of depolymerization of these structures during pulping compared with guaiacyl structures (Van der Klashorst and Strauss 1987). This is nevertheless expected to have a small affect on the methoxy content of the purified lignin.…”

“…As pari of a Programme to find better uses for industrially produced by-product lignin, the properties of various lignins were investigated. In a previous paper (Van der Klashorst and Strauss 1987) the Isolation and quantification of the low molecular mass lignin fragments present in industrial soda/AQ spent pulping liquor were reported. In this report the properties of the industrial soda/AQ eucalyptus lignin are presented and discussed in terms of the Utilization of the lignin, particularly regarding polymeric products.…”