Results 201 to 210 of about 35,476 (250)

Biobleaching of kraft pulp

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
openaire   +1 more source

High sulphidity kraft pulping

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, Disa Tormund, Fredrik Lundqvist   +2 more
openaire   +1 more source

Polysulfide Distribution During Kraft Pulping

Industrial & Engineering Chemistry Research, 2010
Polysulfides 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, Rallming Yang, Lucian A. Lucia   +2 more
openaire   +1 more source

Air pollution control in kraft pulp mills

American Industrial Hygiene Association Journal, 1978
A 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, T L, de Souza, M K, Azarniouch, S, Prahacs   +3 more
openaire   +2 more sources

Bleaching of Kraft Pulp with Commercial Xylanases

Applied Biochemistry and Biotechnology, 1999
The 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, F F, de Moraes, G M, Zanin   +2 more
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Chemical aspects of kraft pulping

Wood Science and Technology, 1980
Kraft 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 ...
openaire   +1 more source

Contribution to On-Line Kraft Pulping Control

IFAC Proceedings Volumes, 1980
Abstract 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, K. Obese-Jecty, G. Le Cardinal, M. Gélus   +3 more
openaire   +1 more source

Ethanol Production from Kraft Pulp

2011
One 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., Yokoyama, S., Imou, K., Yano, S.   +3 more
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A comparison of kraft, PS, kraft-AQ and kraft-NaBH4 pulps of Brutia pine

Bioresource Technology, 2008
The 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, 2011
Under 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, Carlos Vila, José Ariza   +2 more
openaire   +1 more source