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Selective enzyme impregnation of chips to reduce specific refining energy in alkaline peroxide mechanical pulping
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Peter W. Hart
Published/Copyright:
May 7, 2009
Abstract
Eucalyptus wood chips were impregnated with various blends of fiber modifying enzymes prior to preconditioning refiner chemical-alkaline peroxide mechanical pulp processing. The process includes chemical pretreatment and two stages of refining. The energy consumption was compared at the same Canadian standard freeness level of 350 ml. Some enzyme treatments were found to reduce specific refining energy (SRE) by at least 24%. The enzyme hydrolysis within the cell wall was observed by transmission electron microscopy of impregnated chips with high spatial resolution. The enzyme blends that successfully reduced SRE requirements were found to selectively loosen the bonds between the S1 and S2 layers of the fiber wall. Enzymes which selectively attached the S2 layer did not impart any SRE reduction. All experiments for impregnation and pulp processing were conducted at the Andritz Pilot Plant in Springfield, OH.
Keywords: alkaline peroxide mechanical pulping (APMP); cell wall; energy reduction; enzymes; Eucalyptus dunii; mechanical pulp; transmission electron microscopy (TEM)
Received: 2008-7-25
Accepted: 2009-1-30
Published Online: 2009-05-07
Published Online: 2009-05-07
Published in Print: 2009-07-01
©2009 by Walter de Gruyter Berlin New York
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Keywords for this article
alkaline peroxide mechanical pulping (APMP);
cell wall;
energy reduction;
enzymes;
Eucalyptus dunii;
mechanical pulp;
transmission electron microscopy (TEM)
Articles in the same Issue
- Original Papers
- 2D-NMR (HSQC) difference spectra between specifically 13C-enriched and unenriched protolignin of Ginkgo biloba obtained in the solution state of whole cell wall material
- Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 1: Colour evolution and colour changes
- Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 2: Property predictions from colour changes
- The relationship found between fibre length and viscosity of three different commercial kraft pulps
- High-yield kraft pulping of Eucalyptus grandis Hill ex Maiden biotreated by Ceriporiopsis subvermispora under two different culture conditions
- Analysis of microwave vs. thermally assisted grafting of poly(methyl-vinyl ether co-maleic acid)-polyethylene glycol to birch kraft pulp
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- An improved drying model for highly-impermeable hardwoods
- Neutron attenuation coefficients for non-invasive quantification of wood properties
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- Effects of substrate on laboratory spalting of sugar maple
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- Apigenin derivatives from Paulownia tomentosa Steud. var. tomentosa stem barks
- Forming limits for the bulk forming of solid wood
- Meetings
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