Search for dissertations about: "Pappers- och massateknik"

Showing result 1 - 5 of 69 swedish dissertations containing the words Pappers- och massateknik.

  1. 1. Some factors affecting the amount of residual phase lignin during kraft pulping

    University dissertation from Stockholm : KTH

    Author : Mikael E. Lindström; KTH.; [1997]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Deligniflcation; Residual phase lignin; Hydrogensulfide ion; Hydroxide ion; Polysulfides; Ionic strength; Temperature; Lignin; Kraftpulping; Selectivity; viscosity; Kappa number; chemical degradation; Disproportionation; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Cellulose and paper engineering; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Cellulosa- och pappersteknik;

    Abstract : The amount of lignin which needs to be removed according to the slow residual delignification phase in kraft pulping, i e residual phase lignin, has been studied as a function of the process conditions. The variebles studied were the concentrations of hydroxide ions, hydrogensulfide ions, sodium ions (ionic strength) and temperature. READ MORE

  2. 2. Some aspects on TCF-bleachability of softwood alkaline pulps

    University dissertation from Stockholm : KTH

    Author : Karin Sjöström; KTH.; [1999]
    Keywords : 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.; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Cellulose and paper engineering; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Cellulosa- och pappersteknik;

    Abstract : 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. READ MORE

  3. 3. Towards an accurate determination of lignin in chemical pulps : The meaning of kappa number as a tool for analysis of oxidable groups

    University dissertation from Stockholm : KTH

    Author : Jiebing Li; KTH.; [1999]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : Lignin content is the most important parameter in chemicalpulping. At present, kappa number is the most common parameterfor determination of lignin content and the base for otheron-line methods and for industrial automation (Chapter 1). READ MORE

  4. 4. Acid-base properties of and metal ion affinity for oxygen-delignified kraft pulps

    University dissertation from Institutionen för pappers- och massateknologi

    Author : Karin Athley; KTH.; [2000]
    Keywords : Oxygen-delignified kraft pulps; Carboxylate groups; Potentiometric titration; Acid base properties; Constant capacitance model; Metal ion dsitribution; Surface complexes; Complex formation; Donnan theory;

    Abstract : .... READ MORE

  5. 5. Modelling of rheological properties of coating colours

    University dissertation from Institutionen för pappers- och massateknologi

    Author : Fabio Barbesta; KTH.; [2000]
    Keywords : ;

    Abstract : .... READ MORE