Search for dissertations about: "Bleaching"

Showing result 1 - 5 of 94 swedish dissertations containing the word Bleaching.

  1. 1. Totally chlorine free bleaching of softwood kraft pulp : inhomogeneous ozone bleaching and particle elimination

    University dissertation from Institutionen för pappers- och massateknologi

    Author : Maria Ström; KTH.; [1997]
    Keywords : ;

    Abstract : .... READ MORE

  2. 2. The link between kraft cooking and bleaching : influence on ECF bleachabiblity and bleaching effluent parameters

    University dissertation from Karlstad : Karlstad University Studies

    Author : Magnus Björklund; [2004]
    Keywords : ;

    Abstract : The link between kraft cooking and bleaching was investigated, with the focus on how cooking kappa number, cooking conditions and pre-bleaching stages influence ECF bleachability and environmental parameters in the bleaching effluent. In one part of the study standard cooking conditions were used to produce birch and spruce pulps of different kappa numbers and then we studied how the AOX in the ECF bleaching effluent was affected by oxygen delignification, and hot acid stages. READ MORE

  3. 3. Zeolites in pulp bleaching

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Kurt Dyhr; [1998]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Kemisk teknologi; Chemical Technology;

    Abstract : .... READ MORE

  4. 4. Free radical mediated cellulose degradation

    University dissertation from Stockholm : Kemi

    Author : Erik Johansson; KTH.; [2003]
    Keywords : free radicals; cellulose; polymer; average chain length; bleaching; TCF; ozone; degradation;

    Abstract : This thesis addresses the mechanisms involved in cellulosedegradation in general and Totally Chlorine Free (TCF) bleachingof pulp in particular. The thesis shows that the cellulosedegradation during high consistency ozone bleaching is explainedby free radical chain reactions. READ MORE

  5. 5. Influence of acid hydrogen peroxide treatment on refining energy and TMP properties

    University dissertation from Sundsvall : FSCN - Fibre Science and Communication Network

    Author : Karin Walter; Mittuniversitetet.; [2009]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TMP; Black Spruce; Energy reduction; Hydrogen peroxide; Ferrous sulphate; Refining; Inter-stage treatment; Pulp and paper properties; Fenton´s reagent; Bleaching; Sodium dithionite; Brightness; Metals; Fibre dimensions; Cross-sectional dimensions; Chemical composition; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Cellulose and paper engineering; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Cellulosa- och pappersteknik;

    Abstract : The potential of using acid hydrogen peroxide under Fenton conditions to lower the electrical energy consumed during the production of Black spruce (Picea mariana) thermomechanical pulp (TMP) was investigated. The chemical system, which consisted of ferrous sulphate, hydrogen peroxide and optionally an enhancer (3,4-dimethoxybenzyl alcohol, ethylenediaminetetraacetic acid or oxalic acid/sodium oxalate), was evaluated as an inter-stage treatment where the primary refiner was used as a mixer. READ MORE