Results 161 to 170 of about 1,901 (201)
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Holzforschung, 1996
The surface properties of unbleached softwood (Pinus sylvestris) and hardwood (Betula verrucosa) kraft pulps were modified by treating the fibre surfaces with specific xylanase and mannanase (Trichoderma reesei). The amounts and accessibilities of surface carboxyl groups in untreated and enzyme-treated fibres were analyzed using adsorption of cationic ...
Janne Laine +2 more
exaly +2 more sources
The surface properties of unbleached softwood (Pinus sylvestris) and hardwood (Betula verrucosa) kraft pulps were modified by treating the fibre surfaces with specific xylanase and mannanase (Trichoderma reesei). The amounts and accessibilities of surface carboxyl groups in untreated and enzyme-treated fibres were analyzed using adsorption of cationic ...
Janne Laine +2 more
exaly +2 more sources
Characterization of Residual Lignins Isolated from Unbleached and Semibleached Softwood Kraft Pulps
Journal of Wood Chemistry and Technology, 1987Abstract Residual lignins in an unbleached and a semibleached softwood (Pinus taeda L.) kraft pulp were isolated by enzymatic hydrolysis of polysaccharides in the pulps. After purification, the residual lignins were characterized. A dissolved lignin was also isolated from the alkaline extraction spent liquor by acidification and characterized.
Jian-Er Jiang +3 more
exaly +2 more sources
Characterisation of fines from unbleached kraft pulps and their impact on sheet properties
Holzforschung, 2008Abstract Fines are an essential component in the papermaking process because they have a profound influence on the behaviour of the wet web and on the mechanical properties of the final sheet. Primary fines are present in the pulp prior to refining, and secondary fines are produced during refining.
Marie Bäckström +2 more
exaly +2 more sources
Journal of Wood Chemistry and Technology, 1987
Abstract Unbleached kraft pulp (UKP), its residue after extraction with concentrated alkali (α-UKP), bleached kraft pulp prepared from UKP (BKP) and its residue after extraction with concentrated alkali (α-BKP) were permethylated with powdered NaOH and CH3I in their SO2-diethylamine (DEA)-dimethylsufoxide (DMSO) solutions.
Akira Isogai +2 more
openaire +1 more source
Abstract Unbleached kraft pulp (UKP), its residue after extraction with concentrated alkali (α-UKP), bleached kraft pulp prepared from UKP (BKP) and its residue after extraction with concentrated alkali (α-BKP) were permethylated with powdered NaOH and CH3I in their SO2-diethylamine (DEA)-dimethylsufoxide (DMSO) solutions.
Akira Isogai +2 more
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Effect of electrolyte concentration and pH on the beatability of unbleached kraft pulps
Nordic Pulp and Paper Research Journal, 2000Lars-Åke Hammar +2 more
exaly +2 more sources
Xylanase-Resistant Xylan In Unbleached Kraft Pulp
Journal of Wood Chemistry and Technology, 1996ABSTRACT A water-soluble chromophoric xylanase-resitant xylan fraction (LF-D) was separated from a hardwood unbleached kraft pulp (UKP) after hydrolysis with a cellulase/ xylanase-membrane bioreactor. LF-D contained over 70% unremovable inorganic atoms including Si, Na, and S, together with a β-1,4- linked xylan.
Takashi Watanabe +3 more
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Surface characterization of unbleached kraft pulps by means of ESCA
Cellulose, 1994The effect of digestion conditions (amount of effective alkali, digestion time) on the surface compositions of unbleached softwood (Pinus sylvestris) kraft pulp has been investigated by electron spectroscopy for chemical analysis (ESCA). The quantities monitored were the angular dependence of the total O/C ratio, the relative amounts of carbons in ...
Janne Laine +3 more
openaire +1 more source
Study on Alkali-Accessible Chromophores from Unbleached Kraft Pulp
Holzforschung, 2001Summary An approach to a chromophore composition study using the direct size-exclusion chromatography (SEC-UV) analysis of an alkaline extract of pulp fibre walls is described. Absorbance in the 290–405 nm range of 2% and 18% NaOH extract from unbleached pulps obtained by conventional and extended kraft delignification of black alder wood ...
T. Bikova +3 more
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Partial delignification of unbleached kraft pulp with ligninolytic fungi
Biotechnology Letters, 1979Unbleached kraft pulp is partially delignified on incubation under specified conditions with ligninolytic fungi, thereby decreasing requirements for bleaching chemicals. Studies withPhanerochaete chrysosporium demonstrated important effects of nutrient nitrogen and molecular oxygen concentrations. Possible approaches to rate enhancement are suggested.
T. Kent Kirk, H. H. Yang
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UASB performance for bleached and unbleached kraft pulp synthetic wastewater treatment
Chemosphere, 2005This paper presents the performance of two bench scale Upflow Anaerobic Sludge Blanket reactors (UASB) used for the treatment of synthetic substrates that simulate bleached and unbleached cellulose pulp plant wastewaters. The control reactor was fed with diluted black liquor and the treatment reactor with the same substrate plus a mixture of ...
A P, Buzzini, E P, Gianotti, E C, Pires
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