Effect of xylanase pretreatment on the kraft pulping of poplar

Akgül, Mehmet; Gücüş, Mehmet Onurhan; Üner, Birol; Atik, Celil

doi:10.15376/biores.16.1.979-986

Cited by 4 publications

(10 citation statements)

References 12 publications

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“…The xylanase hydrolyzed the xylan, caused the separation of the secondary wall, and increased the surface area by fibrillation, which improved the fiber-to-fiber bonding. The improved fiber-to-fiber bonding may have improved the physical strength properties (Akgül et al 2021;Kumar et al 2021). The FE-SEM analysis of the pulp samples also indicated that there was improved fiber bonding for the destructured-xylanase treated pulp samples (Fig.…”

Section: Effect Of Mechanical and Xylanase Pretreatment On Strength Propertiesmentioning

confidence: 89%

“…The decreased screened pulp yield and reduced Kappa number indicated that there was better xylanase penetration, and it acted on the xylan. The xylanase treatment hydrolyzed the xylan, broke down the lignincarbohydrate bonds, and opened the polymer to facilitate the removal of lignin by white liquor during pulping and decreased the Kappa number of resultant pulp (Akgül et al 2021;Gautam et al 2021). Varghese et al (2020b) performed a xylano-pectinolytic enzyme pretreatment of sugarcane bagasse before soda-anthraquinone pulping.…”

Section: Xylanase Treatmentmentioning

confidence: 99%

“…If enzyme is used as a pretreatment agent, such limitations of biopulping can be avoided. Recently, several studies have reported the effect of xylanase pretreatment on chemical pulping (Varghese et al 2020a(Varghese et al ,2020bAkgül et al 2021). Xylanase pretreatment facilitates the separation of fibrils in the initial stage of fibrillation via the removal of easily accessible xylan, which is mainly located among micrometer-sized cellulose fibrils (Zhou et al 2019;Akgül et al 2021;Kumar 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, several studies have reported the effect of xylanase pretreatment on chemical pulping (Varghese et al 2020a(Varghese et al ,2020bAkgül et al 2021). Xylanase pretreatment facilitates the separation of fibrils in the initial stage of fibrillation via the removal of easily accessible xylan, which is mainly located among micrometer-sized cellulose fibrils (Zhou et al 2019;Akgül et al 2021;Kumar 2021). The pretreatment of sugarcane bagasse and wheat straw with xylanopectinolytic enzyme reduced pulping chemical consumption by 12 to 15% during kraft pulping.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the superior physical strength properties were observed due to enzymatic treatment of the substrate (Varghese et al 2020a,b). Akgül et al (2021) evaluated the effect of xylanase pretreatment on the kraft pulping of poplar and reported improved yield and pulp viscosity after xylanase pretreatment. Further, the xylanase pretreatment resulted in remarkable improvement in the tensile index, breaking length, and burst index.…”

Section: Introductionmentioning

confidence: 99%

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Xylanase pretreatment of mechanically destructured chips of Eucalyptus tereticornis and its effect on kraft pulping

Pandey

Kumar

Singh

et al. 2021

BioRes

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Mechanical pulping of raw wood material is a highly energy intensive and pollution generating step in the papermaking process. This study focused on combined mechanical and xylanase treatment prior to the kraft pulping of E. tereticornis. A screened pulp yield of 49.1% (on oven-dry wood basis) with a Kappa number of 24.9 was obtained at the optimum cooking temperature of 160 °C without any pretreatment of the wood chips. After mechanical treatment (destructuring), a slightly higher screened pulp yield (49.4%) was obtained with a Kappa number of 24.2 at the cooking temperature of 145 °C with the same active alkali charge (15%). The optimum cooking temperature was further reduced to 140 °C for the destructured xylanase-treated wood chips. The xylanase treatment resulted in a 2% reduction in screened pulp yield due to hydrolysis of xylan. However, the Kappa number was reduced to 18.2 after xylanase pretreatment of the mechanically destructured wood chips. The combined pretreatment (destructured and xylanase treatment) of wood chips resulted in a reduction in cooking temperature by 20°C compared to untreated wood chips. Such a reduction in cooking temperature can effectively reduce steam consumption. The combined pretreatment improved the pulp brightness by 2.0 (ISO points) and physical strength properties, which included the tensile index, tear index, and burst index by 11.06%, 21.72%, and 21.79%, respectively, compared to the control.

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Section: Effect Of Mechanical and Xylanase Pretreatment On Strength Propertiesmentioning

confidence: 89%

Section: Xylanase Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Xylanase pretreatment of mechanically destructured chips of Eucalyptus tereticornis and its effect on kraft pulping

Pandey

Kumar

Singh

et al. 2021

BioRes

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Cellulose blends from gel extrusion and compounding with polylactic acid

Müller

Fürtauer

Schmid

et al. 2022

J of Applied Polymer Sci

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Cellulose, dissolved in ionic liquids (IL), can be used successfully in the processing of thermoplastics. To recover the ionic liquid while maintaining the thermoplastic properties, other spacers than IL might be introduced into the cellulose network. Such blend materials have been prepared before by solution blending as reported in the literature. In this study, the preparation and investigation of cellulose and polylactic acid (PLA) blends using an extrusion process with an ionic liquid and co‐solvent for intermediate compatibilization is reported. The obtained transparent films show a homogeneous morphology without phase separation. Thermal analysis showed no separated glass transition for PLA, and FTIR showed hydrogen bonding between cellulose and PLA chains. Thermal stability of the blends with a degradation onset around 270°C lies between regenerated cellulose and pure PLA. The blend tensile strength and elongation of ~40 MPa and 1.3%, respectively, were comparable to a multiphase composite containing twice the molecular weight of PLA. Generally, mechanical performance of the blends was strongly influenced by degradation reactions mainly caused by the ionic liquid used, as well as blend morphology. The study shows that transfer from solution to extrusion processing is generally possible to obtain novel cellulose blends.

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Influence of mechanical operation on the biodelignification of Leucaena leucocephala by xylanase treatment

et al. 2021

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This study aimed at energy reduction during pulping of L. leucocephala by passing the wood chips through an impressafiner followed by xylanase pretreatment. An impressafiner compressed the chips and converted them into spongy materials. Wood chips of L. leucocephala with or without de-structuring and de-structured wood chips followed by enzymatic treatment were subjected to Kraft pulping at different temperatures varying from 135 to 170 °C and active alkali varying from 12 to 20% (as Na 2 O) to observe effect on screened pulp yield and kappa number. The de-structured wood chips followed by enzymatic treatment produced a pulp yield of 48.2% and kappa number 18.6. L. leucocephala without de-structuring produced a pulp yield of 50.1% and kappa number 23.7. When the pulp was subjected to oxygen delignification to reduce kappa number in the vicinity of 18.6, pulp showed shrinkage by 6.64% compared to Kraft pulp of de-structured wood chips followed by enzymatic treatment. Kraft pulp produced from de-structured wood chips of L. leucocephala followed by enzymatic treatment showed net saving of US$ 163.15 per digester over Kraft pulp produced without de-structuring of wood chips of L. leucocephala. Moreover, the pulp obtained by de-structuring followed by enzymatic treatment showed improvement in pulp brightness and physical strength properties including tensile, tear, and burst index significantly compared to pulp obtained without de-structuring.

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Effect of xylanase pretreatment on the kraft pulping of poplar

Cited by 4 publications

References 12 publications

Xylanase pretreatment of mechanically destructured chips of Eucalyptus tereticornis and its effect on kraft pulping

Xylanase pretreatment of mechanically destructured chips of Eucalyptus tereticornis and its effect on kraft pulping

Cellulose blends from gel extrusion and compounding with polylactic acid

Influence of mechanical operation on the biodelignification of Leucaena leucocephala by xylanase treatment

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