| Author | Kuson Somnam |
| Call Number | AIT Thesis no. PP-99-12 |
| Subject(s) | Wood-pulp industry--Environmental aspects
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The vital aspect of the PHOENIX pulp mill is the environmental impact concerning the high
effluent discharges from the bleach plant, which is a result of the pulp on relatively high Kappa
No entering to bleaching. Thus, two-stage oxygen delignification was set up in laboratory scale
to be investigated the effects of retention time, reaction temperature and alkali charge on Kappa
reduction of four pulp samples including High and Low Kappa No bamboo and eucalyptus
pulps. The Kappa No and viscosity were determined and used as the main factors for decision
criteria.
Prolonging retention time, raising reaction temperature and increasing of alkali charge in either
01 or 02 stage resulted in Kappa No decreased whereas viscosity dropped.
The delignification rate achieved of the high Kappa No bamboo pulp of 51.5% was obtained
with the reasonable viscosity drop of 110 units. The delignification rate achieved by 00 stages
was substantially higher than the present PHOENIX average at only 39.0% in No 1 Line
operating with the same bamboo pulp.
The Low Kappa No bamboo pulp approached the optimal delignification rate at 36.5% with the
acceptable viscosity loss about 7.4%. As well, this delignification rate achieved was evidently
higher than the present operation in No 1 Line for the same bamboo pulp of only 22%.
As to the Kappa reduction achieved for the High and Low Kappa No eucalyptus pulps,
approximately 50% delignification rates were obtained with the final Kappa No below 10. The
delignification rates achieved were apparently higher than the PHOENIX operation with the
High Kappa No eucalyptus pulp in No 1 Line and with the Low Kappa No one in No 2 Line.
Thus, it was obvious that the delignification rates achieved by a two-stage oxygen
delignification were significantly higher than the present average in the PHOENIX pulp mill.
Two-stage oxygen delignification is commonly applied in mills with the delignification rates
>50%. This is a realistic option to be considered in the PHOENIX pulp mill. |
| 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) | Kolehmainen, Heikki ;Nazhad, Mousa M.; |
| Scholarship Donor(s) | Phoenix Pulp and Paper Co., Ltd. (Public); |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1999 |