| Author | Duangkamon Baosupee |
| Call Number | AIT Thesis no.PP-12-01 |
| Note | A thesis submitted in partial fulfillment of the requirements for the
degree of Master of Science in
Pulp and Paper Technology, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The flocculation process induced by polymeric additives has been extensively studied. However, a few of researcher studied on the agglomeration of cellulosic fines and precipitate calcium carbonate even through these phenomena is very important to the wet end stage and effect on the efficiency of paper making process such as retention, drainage and runablility. In this study, a laser diffraction technique was used to monitors the mean size of aggregate of cellulosic fines and precipitate calcium carbonate in the absence and in the presence of single polymer (cationic polyacrylamide and poly DADMAC) and dual polymer (poly DADMAC/anionic polyacrylamide). Results showed that precipitate calcium carbonate (PCC) predominatelyattached to fines’ surface by electrostatic force in the absence of polymer additives. For initial flocculation, bridging mechanism by single polymer with cationic polyacrylmide produced flocs as the proportional of the dosages. Moreover, the dual polymer system with poly DADMAC and anionic polyacrylamide also can produce the large aggregates of fines and PCC. However, the using of poly DADMAC as a single polymer system might not created the aggregation of fine and PCC. Under hydrodynamic shear, the dual‐polymer bridging system showed the greatest in the flocs resistance and reflocculation ability. |
| Year | 2012 |
| 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) | Nazhad, Mousa M.; |
| Examination Committee(s) | Hubbe, Martin A.;Hornyak, Gabor;Clemente, Roberto S.;Taweewat Tripattarnan; |
| Scholarship Donor(s) | SCG Paper Public Company Limited, Thailand; |