Characterization of Lignins from Organosolv Pulping According to the Organocell Process Part 1. Elemental Analysis, Nonlignin Portions and Functional Groups

Lindner, Albert; Wegener, G.

doi:10.1080/02773818808070688

Cited by 56 publications

(25 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This trend has been attributed to differences in the proportions of syringyl to guaiacyl units in fractions from a similarly isolated lignin (13) (also see complementary data below). The same behaviour has also been reported for organosolv lignins extracted from cooking spruce chips at increasing times by the Organocell process (19). These authors attributed this trend to the presence of organic nonlignin substances, namely, extractives and sugar degradation products.…”

Section: Elemental Compositionsupporting

confidence: 62%

Fractionation of woodmeal by prehydrolysis and thermal organosolv. Alkaline depolymerization, chemical functionality, and molecular weight distribution of recovered lignins and their fractions

Thring¹,

Chornet²,

Overend³

1993

Can. J. Chem.

View full text Add to dashboard Cite

. Can. J . Chem. 71, 779 (1993). Thermal organosolv glycol lignins and their fractions have been characterized by means of elemental composition, molecular weight distribution, and 'H and I3c NMR spectroscopy. Fractionation of each lignin by sequential solvent extraction produced fractions of increasing molecular weight and polydispersity. Structures in the highest molecular weight fractions were found to be linked by a high proportion of P-0-4 type bonds, whilst the lowest molecular weight fractions consisted of a high content of saturated aliphatic side-chain structures. A noticeable difference in the content of carbohydrate contaminants in both starting lignins indicated the formation of relatively stable lignin-carbohydrate complexes, especially in the lignin recovered from pretreated wood. In addition, depolymerization of the lignins and their fractions to monomeric compounds was explored using alkaline hydrolytic and nitrobenzene oxidative routes. The highest molecular weight fractions from each lignin were identified as the best candidates for production of useful monomeric phenolic compounds. En se basant sur la composition ClCmentaire, la distribution des poids molCculaires et la RMN du 'H et du I3c, on a caractCrisC les lignines thermiques de l'organosolv glycol et leurs fractions. Le fractionnement de chaque lignine par extraction ~Cquentielle par les solvants a fourni des fractions de poids molCculaires et de polydispersitCs croissants. On a trouvC que les structures des fractions de poids molCculaires les plus ClevCs sont likes en grande partie par des liaisons de type P-0-4 alors que celles des fractions de poids molCculaires plus faibles comportent de grandes quantites de chaines laterales aliphatiques saturkes. On a not6 une difference notablehans le contenuen hydrates de carbone des deux lignines; elle indique qu'il y a formation de complexes lignine -hydrate de carbone relativement stables, particulikrement dans la lignine rCcupCrCe du bois prCtraitC. On a de plus examine la dCpolymCrisation des lignines et de leurs fractions en composCs monomeres par hydrolyse alcaline et par oxydation avec du nitrobenzkne. Pour la production de composCs phCnoliques monomkres utiles, on a identifiC que les fractions de poids molCculaires les plus ClevCs de chacune des lignines seraient les plus appropriCes.[Traduit par la rCdaction]

show abstract

Section: Elemental Compositionsupporting

confidence: 62%

Fractionation of woodmeal by prehydrolysis and thermal organosolv. Alkaline depolymerization, chemical functionality, and molecular weight distribution of recovered lignins and their fractions

Thring¹,

Chornet²,

Overend³

1993

Can. J. Chem.

View full text Add to dashboard Cite

show abstract

“…1 were provided by the manufacturer. Details on the production process and qualities of the Organosolv lignin are described by Lindner and Wegener [36].…”

Section: Methodsmentioning

confidence: 99%

Pyrolysis Kinetics of Wood and Wood Components

Willner¹,

Brunner²

2005

Chem. Eng. Technol.

View full text Add to dashboard Cite

show abstract

“…Для решения этой проблемы было предложено ис-пользовать щелочно-органосольвентные процессы. В работе [12] применяли гидроксид натрия для выделения метаноллигнина 50%-ным раствором метанола при 170-190 °С в течение мин. Структура лигнина, полученного в таком процессе, является более измененной, чем лиг-нинов, полученных с использованием автокатализируемых или кислотно-катализируемых ор-ганосольвентных процессов, таких как спиртовая делигнификация.…”

Section: методы выделения органосольвентных лигнинов и изучение их соunclassified

Isolation, Study and Application of Organosolv Lignins (Review)

Кузнецов¹,

Malyar²,

Кузнецова³

et al. 2016

J. Sib. Fed. Univ. Chem.

View full text Add to dashboard Cite

Characterization of Lignins from Organosolv Pulping According to the Organocell Process Part 1. Elemental Analysis, Nonlignin Portions and Functional Groups

Cited by 56 publications

References 15 publications

Fractionation of woodmeal by prehydrolysis and thermal organosolv. Alkaline depolymerization, chemical functionality, and molecular weight distribution of recovered lignins and their fractions

Fractionation of woodmeal by prehydrolysis and thermal organosolv. Alkaline depolymerization, chemical functionality, and molecular weight distribution of recovered lignins and their fractions

Pyrolysis Kinetics of Wood and Wood Components

Isolation, Study and Application of Organosolv Lignins (Review)

Contact Info

Product

Resources

About