Effect of Ultrasound and Xylanase Treatment on the Physical-Mechanical Properties of Bleached Eucalyptus Kraft Pulp

Batalha, Larisse Aparecida Ribas; Silva, Juliana C. da; Jardim, Carolina Marangon; Oliveira, Rubens Chaves de; Colodette, Jorge Luiz

doi:10.4236/nr.2011.22017

Cited by 6 publications

(5 citation statements)

References 5 publications

(5 reference statements)

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“…The effect of xylanases on pulp refining was also studied by Liu et al [ 12 ], Dickson et al [ 18 ] and Batalham et al [ 19 ]. Differences between the published experimental results might be caused by different enzyme: substrate ratios as well as pH and temperature conditions.…”

Section: Discussionmentioning

confidence: 98%

Effect of Cellulases and Xylanases on Refining Process and Kraft Pulp Properties

et al. 2016

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Samples of bleached kraft pine cellulosic pulp, either treated with an enzyme preparation (a Thermomyces lanuginosus xylanase, an Aspergillus sp. cellulase, and a multienzyme preparation NS-22086 containing both these activities) or untreated, were refined in a laboratory PFI mill. The treatment with cellulases contained in the last two preparations significantly improved the pulp’s susceptibility to refining (the target freeness value of 30°SR was achieved in a significantly shorter time), increased water retention value (WRV) and fines contents while the weighted average fiber length was significantly reduced. These changes of pulp parameters caused deterioration of paper strength properties. The treatment with the xylanase, which partially hydrolyzed xylan, small amounts of which are associated with cellulose fibers, only slightly loosened the structure of fibers. These subtle changes positively affected the susceptibility of the pulp to refining (refining energy was significantly reduced) and improved the static strength properties of paper. Thus, the treatment of kraft pulps with xylanases may lead to substantial savings of refining energy without negative effects on paper characteristics.

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Section: Discussionmentioning

confidence: 98%

Effect of Cellulases and Xylanases on Refining Process and Kraft Pulp Properties

et al. 2016

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“…the tear/tensile relationship remained essentially unchanged after Escher-Wyss refining (Dickson et al 2000). The treatment of pulp with xylanase only decreases the tear index, which may be explained by action of xylanases that reduce the intrinsic fibrillar resistance due to removal of superficial hemicelluloses (Batalha et al 2011). The increase in xylanase dose decreased the strength properties and bulk of wheat straw soda-AQ pulp.…”

Section: Effect Of Enzyme Treatment On Strength and Optical Properties mentioning

confidence: 99%

Studies on Xylanase and Laccase Enzymatic Prebleaching to Reduce Chlorine-Based Chemicals During Ceh and Ecf Bleaching

Thakur¹,

Jain²,

Mathur³

2012

BioResources

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The biobleaching efficiency of xylanase and laccase enzymes was studied on kraft pulps from wood and nonwood based raw materials employed in the Indian paper industry. Treatment of these pulps with xylanase enzyme could result in improved properties, showing 2.0% ISO gain in pulp brightness and/or reducing the demand of chlorine-based bleach chemicals by up to 15% with simultaneous reduction of 20 to 25% in AOX generation in bleach effluents. Further, mill-scale trial results revealed that enzymatic prebleaching can be successfully employed with xylanases to reach the same bleach boosting efficacy. Laccase bleaching was also studied on hardwood pulp at a pH around 8.0, where most of the pulp mills in India are operating, in contrast to earlier studies on laccase enzyme bleaching, which were conducted at acidic pHs, i.e. 4.0 to 5.0. In case of laccase bleaching, interesting results were found wherein a bleach-boosting effect was observed even at pH 8.0. Further studies carried out with HOBT as mediator in comparison to the commonly used and expensive ABTS laccase mediator system (LMS) resulted in improvement of the bleaching efficiency with reduction in demand of chlorine dioxide by more than 35%. Potential for further reduction was indicated by the brightness gain, when compared with a control using the DE(p)D bleach sequence.

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“…Xylanase may have changed the crystalline region of fiber and improved fibrillation, which enhanced fiber-tofiber bonding, increased breaking length, and increased the tensile index (Table 4). In contrast, Batalha et al (2011) found different results when kraft pulp was treated with xylanase. In their study, fiber was treated after the kraft pulping process, and xylanase treatment reduced the tensile index.…”

Section: Table 2 Optimized Cooking Conditionsmentioning

confidence: 90%

Effect of xylanase pretreatment on the kraft pulping of poplar

Akgül

Gücüş

Üner

et al. 2020

BioRes

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This study aimed to determine the influence of prehydrolysis of wood chips on the kraft pulping of Populus x euramericana. Optimum cooking conditions were determined by evaluating different alkali concentrations and cooking periods. Xylanase was used to hydrolyze chips before cooking. Prehydrolysis process increased the yield and viscosity of pulp. Consequently, the mechanical properties of paper changed remarkably. In contrast, the optical properties of the unbleached kraft pulp declined due to lignin content.

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Effect of Ultrasound and Xylanase Treatment on the Physical-Mechanical Properties of Bleached Eucalyptus Kraft Pulp

Cited by 6 publications

References 5 publications

Effect of Cellulases and Xylanases on Refining Process and Kraft Pulp Properties

Effect of Cellulases and Xylanases on Refining Process and Kraft Pulp Properties

Studies on Xylanase and Laccase Enzymatic Prebleaching to Reduce Chlorine-Based Chemicals During Ceh and Ecf Bleaching

Effect of xylanase pretreatment on the kraft pulping of poplar

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