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Items for "delignification"

Monoethanolamine (MEA) pulping of beech and spruce wood for production of dissolving pulp

Delignification with the use of monoethanolamine (MEA) is an innovative, environmentally friendly chemical pulping process that, in contrast to conventional pulping methods, works without the use of sulphur compounds...

Keywords: delignification, dissolving pulp, MEA pulping, monoethanolamine, oxygen bleaching, prehydrolysis

10/2004 | Holzforschung, Walter de Gruyter

Lignin reactions in oxygen delignification catalysed by Mn(II)-substituted molybdovanadophosphate polyanion

The lignin oxidation in the oxygen delignification/bleaching process catalysed by Mn(II) substituted heptamolybdopentavanadophosphate polyanion (HPA-5-Mn^II) was studied using monomeric lignin model compounds and Eucalyptus globulus dioxane lignin adsorbed on the bleached sulphite pulp...

Keywords: delignification, lignin, oxidative catalysis, oxygen, polyoxometalate

10/2004 | Holzforschung, Walter de Gruyter

The influence of lignin chemistry and ultrastructure on the pulping efficiency of clonal aspen (Populus tremuloides Michx.)

The variation in wood chemistry among aspen clones of similar age, harvested from a common site in northern British Columbia, Canada, was evaluated...

Keywords: aspen, delignification, guaiacyl lignin, kraft pulping, lignin, molecular mass, MWL, MWELsol, MWELinsol, NMR, nitrobenzene oxidation, quantitative NMR, syringyl lignin, thioacidolysis

03/2006 | Holzforschung, Walter de Gruyter

Molecular weight-functional group relations in softwood residual kraft lignins

An integrated picture of the distribution of functional groups should be provided as a function of molecular size within residual kraft lignins...

Keywords: delignification, kappa number, molecular weight, 31P NMR, residual kraft lignin

11/2005 | Holzforschung, Walter de Gruyter

Soda–AQ delignification of poplar wood. Part 1: Reaction mechanism and pulp properties

Soda and soda-anthraquinone (AQ) pulpings of poplar (Populus deltoides) wood performed in a flow-through reactor gives rise to the formation of coniferyl alcohol (1) sinapyl alcohol (2) and other low molecular weight (LMW) compounds in different stages of delignification...

Keywords: coniferyl alcohol, delignification, flow-through reactor, Grob-type fragmentation, low molecular weight products, poplar wood, reaction mechanisms, sinapyl alcohol, soda-AQ pulping, soda pulping

11/2008 | Holzforschung, Walter de Gruyter

Soda-AQ delignification of poplar wood. Part 2: Further degradation of initially dissolved lignins

Degraded lignin fragments dissolved in pulping liquor during the soda AQ pulping of poplar (Populus deltoides) wood with a flow through reactor were divided in two fractions...

Keywords: carbohydrates, delignification, deposition of xylans on fibers, nitrobenzene oxidation, permanganate oxidation, poplar wood, reactions of lignin fragments, soda-AQ pulping