Results 211 to 220 of about 280,068 (258)
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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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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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A comparison of kraft, PS, kraft-AQ and kraft-NaBH4 pulps of Brutia pine
Bioresource Technology, 2008The aim of this work was to study the effect of adding PS, AQ and NaBH(4) into kraft pulping with special attention given to NaBH(4). Kraft, kraft-AQ, PS, and kraft-NaBH(4) pulps were produced under the same cooking conditions and the pulps produced were compared in terms of pulp and paper properties.
Y, Copur, A, Tozluoglu
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Hemicellulose extraction from aspen chips prior to kraft pulping utilizing kraft white liquor
Biomass and Bioenergy, 2012A. Jun, U. Tschirner, Z. Tauer
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A contribution to the modeling of kraft pulping
The Canadian Journal of Chemical Engineering, 1997AbstractThis paper presents a mathematical model for pulping that considers the effect of alkali diffusion and chemical reaction. An approximation for 3‐dimensional diffusion in wood chips is tested against pulping data. A method for predicting pulp viscosity is also presented.
Niraj Agarwal, Rick Gustafson
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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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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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Trend of Bleaching In Kraft Pulp
JAPAN TAPPI JOURNAL, 2009古くから，クラフトパルプの漂白は，塩素，次亜塩素酸塩，二酸化塩素の塩素系薬品を使って行なわれてきた。しかしながら，1980年代の北欧において，バルト海の汚染問題を契機に塩素漂白排水中の有機塩素化合物の環境影響が議論され，1990年代からは多くの国々で塩素漂白が中止され，ECF（Elementary Chlorine Free）漂白法への転換が進んだ。本報告では，クラフトパルプ用漂白剤をその脱リグニン機構に基づいて分類した上で，漂白剤の変遷という観点から，1960年代から今日に至るまでのクラフトパルプ漂白の変遷について述べる。
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