| Author | Vu Thi Hong Man |
| Call Number | AIT Thesis no. PP-99-1 |
| Subject(s) | Wood-pulp--Bleaching--Vietnam
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of
Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Bamboo is important raw material in pulp and paper industry in many tropical countries.
Nowadays, the trend moving to use plantation hardwood is increasing, especially, eucalyptus
is getting more and more attention. This study was investigated the optimization of oxygen
delignification and ECF bleaching with the sequence D-EO-D-E-D to a brightness of 88-90%
ISO of soda-AQ bamboo and eucalyptus pulps. The results were compared to bamboo and
eucalyptus kraft pulps. An acidic treatment stage before bleaching was also carried out for
soda-AQ pulps to investigate the improvement of bleachability of the pulps.
There was no major difference in response to the oxygen stage between soda-AQ and kraft
pulps but the soda-AQ pulps were lower response to bleaching compared to kraft pulps. The
brightness of 88-89% ISO was achieved but the optimum kappa factor was surprisingly high
both for bamboo and eucalyptus pulps. An acidic treatment stage reduced chlorine dioxide
consumption, especially in case of eucalyptus pulp. The viscosity and yield of the bleached
pulps with acidic treatment were only slightly lower than those of the bleached pulps without
acidic treatment. Soda-AQ pulps were almost comparable to kraft pulps in strength and optical
properties, except tear strength of bamboo soda-AQ pulp suffered markedly. The calculated
production costs of soda-AQ pulps are higher compared to kraft pulps mainly due to the cost
of anthraquinone in cooking and higher chlorine dioxide consumption in bleaching. |
| Year | 1999 |
| 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) | Malinen, Raimo 0. ; |
| Examination Committee(s) | Nazhad, Mousa M. ;Kolehmainen, Heikki ; |
| Scholarship Donor(s) | Government of Finland ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1999 |