Enzymatic bleaching of eucalyptus kraft pulp: effects on the prebleaching filtrate, pulp quality and paper properties
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Maria Tereza Borges
,
Jorge Luiz Colodette
Abstract
Enzymatic bleaching appears to be a promising approach for clean bleaching processes and the reduction of bleaching chemical consumption. In this work, the quality of the filtrates and the pulps has been characterized after enzymatic prebleaching stages of eucalyptus kraft pulp. Four different conditions with xylanase were investigated. Following each prebleaching stage, the properties of the pulp [kappa number, brightness, content of hexenuronic acid (HexA), xylan removal, and pulp yield lost], and of the resulting effluents (chemical oxygen demand (COD), biochemical oxygen demand (BOD), color, and conductivity) were determined. In addition, a complete bleaching sequence was performed to characterize the pulp quality at the end of the sequence. Finally, the pulp was refined in a PFI mill, and the mechanical and physical properties of the resulting paper were determined. The best pulp quality was achieved at pH 7, at which a lower kappa number, higher pulp brightness, and smaller amount of HexA were observed. Under this condition, however, a larger yield loss and a higher effluent COD load had to be accepted. After the complete bleaching sequence, the enzymatic treatments yielded pulps with higher brightness and viscosity as well as with a lower kappa number. The enzymatic treatments resulted in small changes in the mechanical and physical properties of the paper handsheets produced.
©2013 by Walter de Gruyter Berlin Boston
Articles in the same Issue
- Masthead
- Masthead
- Original Articles
- Behavior of xylans from Eucalyptus species. Part 1. The influence of structural features of eucalyptus xylans on their retention in kraft pulp
- Behavior of xylans from the Eucalyptus species. Part 2. Characterization of 4-O-methylglucuronoxylans isolated from black liquors of kraft pulping of Eucalyptus grandis and E. urophylla
- Convenient preparation of a β-O-4-type lignin model trimer via KOH-catalyzed hydroxymethylation and a new protection method
- Topochemistry of heat-treated and N-methylol melamine-modified wood of koto (Pterygota macrocarpa K. Schum.) and limba (Terminalia superba Engl. et. Diels)
- Enzymatic bleaching of eucalyptus kraft pulp: effects on the prebleaching filtrate, pulp quality and paper properties
- Compressive-torsion DMA of yellow-poplar wood in organic media
- Physiomechanical properties of ultra-lightweight foam core particleboard: different core densities
- Fractal dimension analysis of void size in wood-strand composites based on X-ray computer tomography images
- Sorption isotherms of thermally modified wood
- Hot water extracted wood fiber for production of wood plastic composites (WPCs)
- Generic failure mechanisms in adhesive bonds
- Climate response of cell characteristics in tree rings of Picea crassifolia
- Performance of wood treated with prospective organic surface protectants upon outdoor exposure: FTIR spectroscopic analysis of weathered surfaces
- Short Notes
- Studying thermal conductivity of wood at cell wall level by scanning thermal microscopy (SThM)
- Beech wood shrinkage observed at the micro-scale by a time series of X-ray computed tomographs (μXCT)
- Meetings
- Meetings
Articles in the same Issue
- Masthead
- Masthead
- Original Articles
- Behavior of xylans from Eucalyptus species. Part 1. The influence of structural features of eucalyptus xylans on their retention in kraft pulp
- Behavior of xylans from the Eucalyptus species. Part 2. Characterization of 4-O-methylglucuronoxylans isolated from black liquors of kraft pulping of Eucalyptus grandis and E. urophylla
- Convenient preparation of a β-O-4-type lignin model trimer via KOH-catalyzed hydroxymethylation and a new protection method
- Topochemistry of heat-treated and N-methylol melamine-modified wood of koto (Pterygota macrocarpa K. Schum.) and limba (Terminalia superba Engl. et. Diels)
- Enzymatic bleaching of eucalyptus kraft pulp: effects on the prebleaching filtrate, pulp quality and paper properties
- Compressive-torsion DMA of yellow-poplar wood in organic media
- Physiomechanical properties of ultra-lightweight foam core particleboard: different core densities
- Fractal dimension analysis of void size in wood-strand composites based on X-ray computer tomography images
- Sorption isotherms of thermally modified wood
- Hot water extracted wood fiber for production of wood plastic composites (WPCs)
- Generic failure mechanisms in adhesive bonds
- Climate response of cell characteristics in tree rings of Picea crassifolia
- Performance of wood treated with prospective organic surface protectants upon outdoor exposure: FTIR spectroscopic analysis of weathered surfaces
- Short Notes
- Studying thermal conductivity of wood at cell wall level by scanning thermal microscopy (SThM)
- Beech wood shrinkage observed at the micro-scale by a time series of X-ray computed tomographs (μXCT)
- Meetings
- Meetings
