Sökning: "TCF"

Visar resultat 1 - 5 av 28 avhandlingar innehållade ordet TCF.

  1. 1. Free radical mediated cellulose degradation

    Författare :Erik Johansson; KTH; []
    Nyckelord :free radicals; cellulose; polymer; average chain length; bleaching; TCF; ozone; degradation;

    Sammanfattning : 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. LÄS MER

  3. 2. Radical formation under acidic TCF-bleaching conditions

    Författare :Martin Ragnar; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  4. 3. TCF Bleaching of Softwood Kraft Pulp. Metal Management Procedures

    Författare :Harald Brelid; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bleaching; manganese; Kraft pulps; iron; copper; hydrogen peroxide; acid pretreatment; calcium; magnesium; liquid chromatography; ion exchange; metal complexes; EDTA;

    Sammanfattning : The aim of this work has been to increase knowledge of the influence of the metal ion content in softwood kraft pulp on peroxide bleaching and to investigate the effects of different metal management procedures at various stages in the production of TCF pulps (i.e. LÄS MER

  5. 4. Some aspects on TCF-bleachability of softwood alkaline pulps

    Författare :Karin Sjöström; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bleachability; chlorine-free bleaching; softwoods; kraft pulps; alkaline sulfite pulps; oxygen; hydrogen peroxide; ozone; hydrogen sulfide ion; hydroxide ion; temperature; sodium ion.; Cellulose and paper engineering; Cellulosa- och pappersteknik;

    Sammanfattning : The bleachability of softwood oxygen delignified pulps has been studied, i.e. the ease (requirement of bleaching chemicals) with which the pulps can be brightened to a target brightness in totally chlorine free (TCF) bleaching stages, including hydrogen peroxide, ozone and chelating agent stages. LÄS MER

  7. 5. on the thermal yellowing of TCF- bleached birch kraft pulp

    Författare :Anders Granström; KTH; []
    Nyckelord :Ageing; Brightness reversion; Chalaton; Colour reversion; Dicarboxylic acids; Discoloration; HexA; Hexenuronic acid; Kraft pulp; Metal profile; Thermal yellowing; Xylan;

    Sammanfattning : .... LÄS MER