SearchPublisher and Institutes
You are here: Home :: Keyword index :: pre bis ret :: reproductive potential - resonance 
residual lignin
Items for "residual lignin"
Size exclusion chromatographic and UV-VIS absorption analyses of unbleached and bleached softwood kraft pulps using LiCl/1,3-dimethyl-2-imidazolidinone as a solvent
Unbleached and bleached kraft pulps and holocellulose prepared from softwood were totally soluble in 8% LiCl/1,3-dimethyl-2-imidazolidinone (LiCl/DMI)...
Keywords: cellulose, degree of polymerization, hemicellulose, LiCl/DMI, residual lignin, SEC-PDA-MALLS, softwood holocellulose, softwood kraft pulps, UV-VIS absorption
05/2007 | Holzforschung, Walter de GruyterAn improved procedure for isolation of residual lignins from hardwood kraft pulps
Residual lignin preparations were isolated from birch, aspen and
Keywords: cellulase, enzymatic hydrolysis, hardwood kraft pulp, hemicellulase, lignin-carbohydrate complex, residual lignin
08/2004 | Holzforschung, Walter de GruyterEffect of UV radiation on the carbonyl distribution in different pulps
The effect of UV irradiation on unbleached and TCF-bleached dissolving pulp samples of different provenience, a beech sulphite and an eucalyptus prehydrolysis kraft pulp, has been analyzed according to the CCOA method, evaluating the changes in the molecular weight distribution, the total number of carbonyl groups and the carbonyl group profiles of each pulp...
Keywords: carbonyl groups, CCOA method, residual lignin, TCF bleaching, UV irradiation
10/2004 | Holzforschung, Walter de GruyterChanges 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 GruyterCarbohydrate structures in residual lignin-carbohydrate complexes of spruce and pine pulp
Residual lignin carbohydrate complexes (RLCC) were isolated enzymatically from spruce and pine pulp...
Keywords: chemical pulp, fiber, fines, lignin-carbohydrate complex, Norway spruce, oxygen delignification, Picea abies, Pinus sylvestris, polysaccharide, residual lignin, Scots pine, structural analysis
10/2004 | Holzforschung, Walter de GruyterElucidating carboxylic acid profiles for extended oxygen delignification of high-kappa softwood kraft pulps
Two laboratory high-lignin-content softwood (SW) kraft pulps with kappa values of 48.0 and 49.5, prepared by cooking at high and low active alkali (AA), were used for the study of fiber charge development during two-stage oxygen delignification with inter-stage washing (OwO)...
Keywords: carbohydrate, carboxylic acid, extended oxygen delignification, fiber charge, kraft cooking, NMR analysis, residual lignin
03/2006 | Holzforschung, Walter de GruyterFluorescence spectroscopy for chromophore studies on bleached kraft pulps
Fluorescence techniques are highly sensitive and, since aromatic lignin is the most likely source of natural pulp fluorescence, they are suitable for detailed investigation of residual lignin in bleached pulps...
Keywords: bleaching, brightness, brightness reversion, carbonyl, chemical analysis, chromophore, Fluorescence, kraft pulp, residual lignin
08/2007 | Holzforschung, Walter de GruyterLignin modification in the initial phase of softwood kraft pulp delignification with polyoxometalates (POMs)
Commercial softwood kraft pulp with kappa number 30.5 (KP30.5) was delignified with polyoxometalates (POM, Na5(+2)[SiV1(-0.1)MoW10(+0.1)O40]), and POM-treated kraft pulp of kappa number 23.6 was obtained (KPPOM,23.6)...
Keywords: acid hydrolysis, commercial softwood kraft pulp, lignin-cellulose association, polyoxometalate delignification, residual lignin
08/2007 | Holzforschung, Walter de GruyterEffect of autohydrolysis of Eucalyptus globulus wood on lignin structure. Part 1: Comparison of different lignin fractions formed during water prehydrolysis
The effect of autohydrolysis of
Keywords: autohydrolysis, biorefinery, lignin degradation, milled wood lignin (MWL), nuclear magnetic resonance (NMR), prehydrolysis kraft pulping, residual lignin
11/2008 | Holzforschung, Walter de Gruyter