High temperature chlorine dioxide bleaching of hardwood pulp | |
| Author | Pang, Li Bo |
| Call Number | AIT Thesis no.PP-04-11 |
| Subject(s) | Bleaching Wood-pulp--Bleaching |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. PP-04-11 |
| Abstract | Hexenuronic acid consumes bleaching chemicals, decreases brightness and lead to more brightness reversion. A high temperature chlorine dioxide bleaching at 90°C (D*) was applied in the first stage of D-EOP-D sequences to remove hexenuronic acid. The effect of kappa factor of high temperature chlorine dioxide stage for eucalyptus camaldulensis was studied. Kappa factor of 0.2 in D* showed the best performance. The option of dividing the high temperature chlorine dioxide stage into two phases (Do/D*-Eop-D) was also tested. The brightness gain was similar with D*-Eop-D. The ability in removing HexA of Do/D* stage was similar with that of a regular Do stage. Slightly better tear-tensile development for this option was observed. Finally the effect of cooking kappa number and wood species on bleachability with sequence ofD*-EOP-D was studied. With cooking to higher kappa number of near 20, both eucalyptus camaldulensis and acacia mangium showed lower bleachability with D*-Eop-D. No benefit in brightness gain for acacia mangium was observed when applying D*-Eop-D. |
| Year | 2004 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. PP-04-11 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Pulp and Paper Technology (PP) |
| Chairperson(s) | Malinen, Raimo O.; |
| Examination Committee(s) | Kolehmainen, Heikki; Lehtinen, Esa; |
| Scholarship Donor(s) | Government of Finland;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2004 |