Changes within the modified kraft process aiming to improve TCF bleachability
1999 (English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 25, no 5, 176-182 p.Article in journal (Refereed) Published
the investigated process modifications were: presulphonation, postsulphonation, polysulphide pretreatment and polysulphide pretreatment combined with a postsulphonation. The influence of the degree of delignification in the cook, on the selectivity and bleachability, was also investigated. The pulps were produced from softwood chips and were oxygen delignified before bleaching according to an AZQP sequence. All the investigated process variants had better process selectivity (pulp viscosity at a given brightness) and the pulps produced with a postsulphonation showed better bleachability, than the reference pulp. The bleachability and the process selectivity was improved by interrupting the cook at a higher kappa number and instead extending the delignification in the oxygen stage.
Place, publisher, year, edition, pages
1999. Vol. 25, no 5, 176-182 p.
kraft pulping, modified kraft process, pretreatment, sulfonation, polysulfide pulping, chlorine free bleaching, kraft pulps, softwoods, delignification, oxygen, pulp properties, selectivity, SOFTWOOD, PULPS, SEQUENCES
Chemical Process Engineering Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-13900ISI: 000080562100005OAI: oai:DiVA.org:kth-13900DiVA: diva2:328083
QC 201007012010-07-012010-07-012010-07-01Bibliographically approved