Results 201 to 210 of about 11,956 (228)
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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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Ethanol Production from Kraft Pulp
2011One of the most common and viable methods to remove lignin from wood is kraft pulping, which is a welldeveloped technology used on a commercial scale. Although kraft pulp is essentially raw material for paper, 70% of plant availability is good enough to meet the current pulp demand in Japan.
Hasegawa, F. +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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Eucalyptus kraft pulp production: Thermogravimetry monitoring
Thermochimica Acta, 2011Under oxidative environment the thermal degradation of lignocellulosic materials like wood or pulp is sensitive to slight composition changes. For this, in order to complement the chemical and X-ray diffraction results, thermogravimetric analyses (TGA) were used to monitor pulp production in a modern pulp mill.
Agustín G. Barneto +2 more
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Pre-bleaching of kraft acacia pulp
Nordic Pulp & Paper Research Journal, 2019AbstractKraft pulps from acacia hybrid,Acacia mangiumof 8 years old andAcacia auriculiformisof 6, 8 and 10 years old were pre-treated with oxygen, peroxyformic acid and acid treatment prior to bleaching. The kappa number reduction was 52–63 % by oxygen delignification, 31–35 % by peroxyformic acid (PFA) pre-treatment and 11–13 % by acid pre-treatment ...
Moinul Haque +5 more
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Atmospheric emissions of Kraft pulp mills
Chemical Engineering and Processing: Process Intensification, 2002Abstract This paper describes systematic work done in the field of atmospheric emissions from Portuguese Kraft pulp mills. This study results in the determination of emission factors from stationary sources that proved to be an important tool to assess the need for investment on air pollution abatement equipment, particularly with respect to mal ...
João C.M Bordado, João F.P Gomes
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