AI SearchBleachability of kraft pulps : acacia auriculiformis and the mixture of acacia auriculiformis and eucalyptus camaldulensis
Call Number: AIT Thesis no.PP-08-1 Material type:
SeriesSeries: Asian Institute of Technology. Thesis ; no. PP-08-1Publication details: Pathum Thani, Thailand : Asian Institute of Technology, 2008Description: 1 online resource (53 leaves) : illSubject(s): Online resources: Dissertation note: Thesis (M.Eng.) - Asian Institute of Technology, 2008 Summary: Bleachability of kraft pulps cooked from different kinds of chip, namely Acacia auriculiformis, Eucalyptus camaldulensis, and their mixture was investigated. Cooking with the mixture of chips limited the development of brightness ceiling. The kappa factor in Do stage being suitable for acacia pulp with inlet kappa value 11.83 was 0.20. Similarly, end pH value in D₀ stage around 2.5 gave the best performance for D₀ bleaching. Hot acid treatment substantially increased brightness while strength properties did not suffer. By contrary, high temperature and long retention time in D₀ stage were only marginally improved pulp quality. Hot acid treatment without coupling a consequent washing stage also had a good tendency towards brightness but strength properties of bleached pulp was heavily suffered. Formaldehyde showed positive effect in term of improving pulp quality and it was a good suggestion for the saving of chlorine dioxide in ECF bleaching. Hydrogen peroxide did not significantly increase brightness when it was applied in final bleaching. The application of high temperature in D₁ stage of D₀EpD₁D₂ bleaching sequence increased pulp quality but marginally
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Asian Institute of Technology Library Archives | AIT Thesis no.PP-08-1 (Browse shelf(Opens below)) | Available | 30050160026182 |
Submitted in partial fulfillment of the requirements for the degree of Master of Engineering
Thesis (M.Eng.) - Asian Institute of Technology, 2008
Bleachability of kraft pulps cooked from different kinds of chip, namely Acacia auriculiformis, Eucalyptus camaldulensis, and their mixture was investigated. Cooking with the mixture of chips limited the development of brightness ceiling. The kappa factor in Do stage being suitable for acacia pulp with inlet kappa value 11.83 was 0.20. Similarly, end pH value in D₀ stage around 2.5 gave the best performance for D₀ bleaching. Hot acid treatment substantially increased brightness while strength properties did not suffer. By contrary, high temperature and long retention time in D₀ stage were only marginally improved pulp quality. Hot acid treatment without coupling a consequent washing stage also had a good tendency towards brightness but strength properties of bleached pulp was heavily suffered. Formaldehyde showed positive effect in term of improving pulp quality and it was a good suggestion for the saving of chlorine dioxide in ECF bleaching. Hydrogen peroxide did not significantly increase brightness when it was applied in final bleaching. The application of high temperature in D₁ stage of D₀EpD₁D₂ bleaching sequence increased pulp quality but marginally
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