The effect of cooking alkali concentration profile on pulp and paper properties of Eucalyptus Camaldulensis | |
| Author | Sann Hlaing |
| Call Number | AIT Thesis no.PP-00-4 |
| Subject(s) | Eucalyptus camaldulensis Kraft cooking |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | The use of hardwood in kraft pulping has enjoyed a rapid increase recently. Current trends toward higher yield and lower kappa number have sparked renewed interest in modified pulping and have prompted this study. This study investigated the effect of cooking EA profile with split, multiple white liquor addition on kraft pulp yield, carbohydrate yield and pulp properties on Eucalyptus camaldulensis. Conventional kraft cooking was carried out on the same chips to provide a basis for comparison. The bleachability of the CK and modified pulps was also evaluated with an ECF bleaching sequence of ODED to full brightness. In addition, handsheet properties made from all pulps were measured to evaluate strength properties. Results from the study indicated that the EA concentration profile significantly affects pulp yield and carbohydrate yield, viscosity and pulp properties. Lowering the EA concentration in the early and high in the later stages increased pulping yield by 1-2%. This result also indicated modified cooked pulp gave higher yield than conventional cooked pulp in the same kappa number. The yield increase was mainly due to higher cellulose retention. These results suggest that EA profiling play a significant role for pulp yield and pulp viscosity. There was no major difference in response to the oxygen delignification and bleaching compared to kraft pulps. Strength results showed that there was no decrease in strength for all modified pulp; if anything there was an increase in pulp strength. These results showed that modified cook can be used to decrease kappa number and increase pulp production with no detrimental effect on pulp strength. |
| Year | 2000 |
| 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) | Ruhanen, Mauno; |
| Examination Committee(s) | Kolehmainen, Heikki ;Nazhad, Mousa M. ;Malinen, Raimo 0.; |
| Scholarship Donor(s) | Government of Finland; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2000 |