Results 181 to 190 of about 6,042 (233)
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Comparison between Green Liquor Pretreatment-Kraft Pulping and Conventional Kraft Pulping
Advanced Materials Research, 2013This paper studied the differences of pulping performances, beating characteristics and strength properties between green liquor pretreatment-Kraft pulping and conventional Kraft pulping based on previous optimized pulping conditions. The green liquor pretreatment-Kraft pulping has higher yield, lower Kappa number, reduced residual effective alkali and
Zhang Hong Xie +3 more
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Influence of Kraft Pulping on Carboxylate Content of Softwood Kraft Pulps
Industrial & Engineering Chemistry Research, 2006This study characterizes changes in fiber charge, which is the carboxylate content of fibers, for two sets of kraft pulps: (1) conventional laboratory cooked loblolly pine kraft pulps and (2) conventional pulping (CK) versus low solids pulping (LS) pulps.
Zheng Dang +2 more
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Process Biochemistry, 1992
Abstract This review reviews current research on the application of biotechnology to the bleaching of kraft pulp. Biobleaching research focuses on using white rot fungi, and ligninase and hemicellulase enzymes. Bleaching with white rot is generally very slow and the primary problems appear to be the control of cellulose degradation, the technical ...
Pratima Bajpai, Pramod K. Bajpai
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Abstract This review reviews current research on the application of biotechnology to the bleaching of kraft pulp. Biobleaching research focuses on using white rot fungi, and ligninase and hemicellulase enzymes. Bleaching with white rot is generally very slow and the primary problems appear to be the control of cellulose degradation, the technical ...
Pratima Bajpai, Pramod K. Bajpai
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Nordic Pulp & Paper Research Journal, 2009
The object of this project was to evaluate the effect of high sulphidity on the performance of the kraft cooking process.
Leelo Olm +2 more
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The object of this project was to evaluate the effect of high sulphidity on the performance of the kraft cooking process.
Leelo Olm +2 more
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Polysulfide Distribution During Kraft Pulping
Industrial & Engineering Chemistry Research, 2010Polysulfides increase yield from kraft pulping by selectively oxidizing the reducing end groups of the polysaccharides thereby protecting them from hydrolysis. The principal polysulfide homologue formed in white liquor after addition of elemental sulfur was found to be the S22− species.
Sujit Banerjee +2 more
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Air pollution control in kraft pulp mills
American Industrial Hygiene Association Journal, 1978A patented gas scrubbing process, whereby the emissions of malodorous reduced sulphur compounds are effectively and economically reduced, is described. Stack gases are scrubbed with an alkaline suspension of activated carbon. Reduced sulphur compounds as well as sulphur oxides are converted to sodium salts which are subsequently recovered and utilized ...
S P, Bhatia +3 more
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Bleaching of Kraft Pulp with Commercial Xylanases
Applied Biochemistry and Biotechnology, 1999The performance of commercial xylanases in totally chlorine-free bleaching of kraft pulp from conifer was tested with Pulpzyme HC (Novo Nordisk) and Cartazyme NS-10 (Sandoz/Clariant), at 500 U/kg of dry pulp, respectively. The treatment with Pulpzyme (XP) or Cartazyme (XC) has been combined with stages of bleaching using: oxygen (O), sulfuric acid (A),
J H, de Araújo +2 more
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Chemical aspects of kraft pulping
Wood Science and Technology, 1980Kraft pulping is interpreted in chemical terms on the basis of results from extensive qualitative and quantitative model experiments. In essence, the behavior of lignin is explained as a competition between degradation reactions, mainly involving aryl ether cleavage with participation of neighboring groups, and condensation reactions, comprising ...
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Contribution to On-Line Kraft Pulping Control
IFAC Proceedings Volumes, 1980Abstract In this paper, an on-line sensor, based on ultra-violet absorption of the black liquor in a Kraft pulping process is described. The sensor, tested and improved on a 45-1iters pilot digester, appeared to be accurate and to give reproducible measurements which compared favourably with off-line ultra-violet absorption measurements. In order to
R. Capart +3 more
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