Oxygen and ozone delignification of high kappa number sulphur-free soda hardwood pulps-pulp and papermaking properties

Sari Asikainen, Antero Varhimo, Tom Hultholm, Esa Hassinen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

Soda birch pulps cooked to kappa numbers 35 and 50 were delignified using oxygen and ozone. The following process modifications were studied: 1) Medium kappa number (35) soda cooking followed by oxygen/ozone delignification and final bleaching: O-O-A/D-Eop-D-P and O-Z-D-Eop-D-P. 2) High kappa number (50) soda cooking followed by oxygen/ozone delignification and final bleaching: O-Z-D-Eop-D-P and O-O-Z-D-Eop-D-P. The results showed that stopping the soda cook at higher kappa number than in traditional cooking and continuing the delignification with oxygen and ozone would be a promising process alternative to obtain paper grade pulp with adequate properties and sulphur free lignin as a by-product.
Original languageEnglish
Title of host publicationIPBC 2014 Grenoble
Subtitle of host publicationInternational Pulp Bleaching Conference
EditorsGopal C. Goyal, Christine Chirat
Place of PublicationGrenoble
Pages69-75
Publication statusPublished - 2014
MoE publication typeB3 Non-refereed article in conference proceedings
EventInternational pulp bleaching conference, IPBC 2014 - Grenoble, France
Duration: 29 Oct 201431 Oct 2014

Conference

ConferenceInternational pulp bleaching conference, IPBC 2014
Abbreviated titleIPBC 2014
CountryFrance
CityGrenoble
Period29/10/1431/10/14

Keywords

  • oxygen delignification
  • ozone
  • sulphur free
  • high kappa number
  • birch

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    Asikainen, S., Varhimo, A., Hultholm, T., & Hassinen, E. (2014). Oxygen and ozone delignification of high kappa number sulphur-free soda hardwood pulps-pulp and papermaking properties. In G. C. Goyal, & C. Chirat (Eds.), IPBC 2014 Grenoble: International Pulp Bleaching Conference (pp. 69-75).