Acacia Mangium and Acacia Crassicarpa kraft cooking and effect on EDF bleaching | |
| Author | Purnawan, Hendra Tri |
| Subject(s) | Kraft cooking Mangium |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Pulp and Paper Technology, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Quality and performance comparison of Acacia mangium and Acacia crassicarpa by variation kappa number targets and effect of cooking kappa number in kraft cooking and bleaching were the main objective of this study. Both Acacia mangium and Acacia crassicarpa chips were cooked in a laboratory digester with variable kappa number targets. Those kappa targets were high (20-22), medium (16-18), and low (12-14) which were obtained by adjusting alkali charges and cooking conditions. After cooking, oxygen delignification and bleaching were following process stages. Results from laboratory cooking these two of Acacia species show that A. mangium has higher delignification rate and is relatively easier to cook compared to A. crassicarpa. Similar behavior of both Acacia pulps was observed in oxygen delignification. Improved bleachability and higher brightness level were reached by A. mangium in bleaching. In testing of pulp mechanical properties, both Acacias have very similar properties. Cooking results show that high kappa number was more beneficial than low kappa. It has better bleachability, higher brightness ceiling, higher viscosity, and slightly better pulp strength properties. Although high kappa has higher HexA content, but in overall, this does not seems to give any significant negative impact on pulp properties. |
| Year | 2009 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Pulp and Paper Technology (PP) |
| Chairperson(s) | Viljakainen, Esa; |
| Examination Committee(s) | Nazhad, Mousa M.;Malinen, Raimo O.;Mirshokraie, Seyed Ahmad; |
| Scholarship Donor(s) | Riaupulp (Indonesia); |