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.
|Title of host publication||IPBC 2014 Grenoble|
|Subtitle of host publication||International Pulp Bleaching Conference|
|Editors||Gopal C. Goyal, Christine Chirat|
|Place of Publication||Grenoble|
|Publication status||Published - 2014|
|MoE publication type||B3 Non-refereed article in conference proceedings|
|Event||International pulp bleaching conference, IPBC 2014 - Grenoble, France|
Duration: 29 Oct 2014 → 31 Oct 2014
|Conference||International pulp bleaching conference, IPBC 2014|
|Abbreviated title||IPBC 2014|
|Period||29/10/14 → 31/10/14|
- oxygen delignification
- sulphur free
- high kappa number
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).