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Items for "kraft pulping"

Changes in the lignin-carbohydrate complex in softwood kraft pulp during kraft and oxygen delignification

Three kraft pulps in the kappa number range between 50 and 20 and the same pulps oxygen-delignified to similar lignin contents (kappa approximately 6) were analyzed for lignin-carbohydrate complexes (LCC) by a method based on selective enzymatic hydrolysis of the cellulose, and quantitative fractionation of the LCC...

Keywords: bleachability, kappa number, kraft pulping, lignin-carbohydrate complex (LCC), oxygen delignification, residual lignin, specific absorptivity

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

Characteristics of NAEM salt-catalyzed alcohol organosolv pulping as a biorefinery

Characteristics of the NAEM [neutral alkali-earth metal; CaCl₂ and Mg(NO₃)₂ in this study] salt-catalyzed alcohol organosolv pulping of softwood were investigated and compared to AlCl₃-catalyzed kraft pulping...

Keywords: Ethanol, fermentation, hydrolysate, kraft pulping, methanol, organosolv biorefining, organosolv pulping, softwood pulping, sugar

05/2006 | Holzforschung, Walter de Gruyter

Kraft pulp from budworm-infested Jack pine

This study evaluated the quality of kraft pulp from budworm-infested jack pine. The logs were classified as merchantable live, suspect, or merchantable dead...

Keywords: blue stain, insect infestation, jack pine, kraft pulping, maceration, SilviScan, small-diameter trees

07/2006 | Holzforschung, Walter de Gruyter

Dynamics of the effective capillary cross-sectional area during the alkaline impregnation of eucalyptus wood

Wood diffusion is strongly affected by the effective capillary cross-sectional area (ECCSA), which is the area of paths available for diffusion...

Keywords: alkali impregnation, deacetylation, diffusion, effective capillary cross-sectional area, kraft pulping

07/2008 | Holzforschung, Walter de Gruyter

Direct method for the determination of phenolic hydroxyl groups in pulp

For evaluation of changes in phenolic lignin units during kraft pulping and bleaching, a direct method based on UV reflectance measurements of pulp handsheets was tested...

Keywords: bleaching, kraft pulping, lignin, Phenols, UV spectroscopy

11/2007 | Holzforschung, Walter de Gruyter

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