TITLE

EFFECT OF LAST STAGE BLEACHING WITH PERACETIC ACID ON BRIGHTNESS DEVELOPMENT AND PROPERTIES OF EUCALYPTUS PULP

AUTHOR(S)
Barros, Denise P.; Silva, Vanessa L.; Hä mä lä inen, Hannu; Colodette, Jorge L.
PUB. DATE
March 2010
SOURCE
BioResources;2010, p881
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Investigation of last stage bleaching with peracetic acid is the main subject of this paper. Proper conditions were established to apply peracetic acid as the last bleaching stage of the D(Ep)D/Paa, DHT(Ep)D/Paa, A/D(Ep)D/Paa, DHT/Q(PO)Paa and Z/ED/Paa sequences. In addition, the impact of last stage bleaching with Paa on pulp refinability and strength properties was determined. Peracetic acid was consumed relatively fast when applied as the last stage of ECF bleaching sequences. A reaction time of 120 min at 75 °C and pH 5.0 is seemingly adequate regardless of the Paa dose, in the range of 1-5 kg/odt pulp and bleaching sequence. The optimum dose of Paa depends upon the sequence under investigation. In general the Paa application as last bleaching stage caused slight decrease in pulp viscosity, kappa number and HexA content but had no significant effect on pulp reversion and L*a*b* coordinates. The refinability and bonding strength properties of the pulps bleached with the sequences DHT(Ep)DD and DHT(Ep)D/Paa were quite similar when the pH of the last bleaching stage of both sequences were near 5. These properties improved slightly when Paa bleaching pH was raised to 8.5.
ACCESSION #
67691428

 

Related Articles

  • Roll-in technique eases precipitator replacement at Roanoke Rapids Mill. Clayton, Stan; McGlohn, Robert // Pulp & Paper;Mar97, Vol. 71 Issue 3, p75 

    Presents a unique method of reducing the problems with recovery boilers utilized at Champion International's mill in Roanoke Rapids, North Carolina. Problems with the precipitator accompanying the boiler; Proposal of a unique scheme dubbed as `The Magic Duct'; Elements of the new method.

  • International Paper follows science in ECF, TCF choice. Deardorff, Tom // Pulp & Paper;Oct97, Vol. 71 Issue 10, p97 

    Focuses on International Paper Co.'s use of elemental chlorine free (ECF) bleaching at its kraft mills in the United States and Europe. Reliance on scientific evidence to select ECF over totally chlorine free (TCF) bleaching; Analysis of the health of aquatic ecosystems adjacent to the...

  • BRANQUEAMENTO DE POLPA DE EUCALIPTO COM SEQUÊNCIAS CURTAS. Milagres, Flaviana Reis; Colodette, Jorge Luiz; Rabelo, Marcos Sousa; de Carvalho, Danila Morais // Ciência Florestal (01039954);2011, Vol. 21 Issue 1, p159 

    Eucalyptus spp kraft pulp, due to its high content of hexenuronic acids, is quite easy to bleach. Therefore, investigations have been made attempting to decrease the number of stages in the bleaching process in order to minimize capital costs. This study focused on the evaluation of short ECF...

  • ECF Bleaching with Molybdenum Activated Acid Peroxide and Its Impact on Eucalyptus Pulp Properties and Effluent Quality. Azevedo, Marco Antônio Bandeira; Pasa, Vânya Márcia Duarte; Hämäläinen, Hannu; Mounteer, Ann Honor; de Oliveira, Rubens Chaves; Colodette, Jorge Luiz // Natural Resources (2158-706X);Mar2011, Vol. 2 Issue 1, p61 

    Acid hydrogen peroxide catalyzed with molybdenum (PMo stage) is effective to decrease pulp kappa number and potentially minimize chlorine dioxide demand in subsequent ECF bleaching. This study aimed at developing cost-effective methods for applying PMo as the first stage bleaching for eucalyptus...

  • APRIL WRAPS UP PULP LINE OVERHAUL AT RIZHAO.  // PPI: Pulp & Paper International;Oct2006, Vol. 48 Issue 10, p8 

    The article reports on Asia Pacific Resources International's completion of an overhaul of the bleached hardwood kraft pulp line at its mill in Rizhao City in Shandong Province, China. The unit was closed for the revamp on August 28, 2006 and restarted on September 8, 2006. The company said it...

  • MBBRs are compact, flexible.  // PPI: Pulp & Paper International;Oct2006, Vol. 48 Issue 10, p28 

    The article focuses on the need for integrated producer of pulp and paper Suzano Bahia Sul to increase its wastewater treatment capacity and efficiency, in relation to the construction of a one million-ton per year bleached eucalyptus kraft pulp line at its Mucuri Mill in the southern part of...

  • Green Technology for Bleaching. MÉTAIS, ALEXIS; LARNICOL, PIERRE; VERKOEYEN, GUY; HOSTACHY, JEAN-CHRISTOPHE; BLANC, JÉRÔME; SMEETS, FILIP // Paper 360;Nov/Dec2014, Vol. 9 Issue 6, p26 

    The article reports on the use of green technology for bleaching in paper and pulp industry. Topics discussed include the amount of bleaching chemicals required by a large pulp mill project on a daily basis, how on-site production of bleaching chemicals help reduce carbon footprint, and...

  • LESS IS MORE IN PULP BLEACHING. Williamson, Mark // PPI: Pulp & Paper International;Jan2009, Vol. 51 Issue 1, p33 

    The article provides information on pulp bleaching of several pulp mills in Brazil. It states that Brazil is considered as the home of some largest pulp mills in the world. The mills uses minimum amount of brightening chemicals which produce the bright white pulp, thus providing just the right...

  • SCALE AWAY. Duffy, Brian; Konopa, Joe // PPI: Pulp & Paper International;Aug2010, Vol. 52 Issue 8, p23 

    The article discusses the implementation of a complete bleach plant contaminant control program within a kraft pulp mill. In partnership with Nalco Co., regular mill testing includes monitoring all process streams for their contribution to scale deposition and continuing to monitor bleach plant...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics