Determination of the effect of hexenuronic acid removal on total chlorine free bleaching and pulp properties of Acacia crassicarpa | |
| Author | Hossan, Md. Shahadat |
| Call Number | AIT Thesis no.PP-14-04 |
| Subject(s) | Acacia Paper industries Pulpwood |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master o f Science in Pulp and Paper Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. PP-14-04 |
| Abstract | Bleached Acacia pulp is considered the fastest growing global source of virgin papermaking fibers in pulp and paper industries. H igh brightness and brightness stability with minimal consumption of bleaching chemicals are mostly desired . Wood chips of Acacia crassicarpa were studied for t he formation and degradation of HexA content during the conventional and modified kraft pulping a t laboratory scale. T he chips were subjected to pre - hydrolysis (PH) and subsequently cooked by adding polysulfide and anthraqu inone additive. H igher yield and lower kappa number (KN) were found in Kraft pulp than pre - hydrolyzed polysulfi de anthraquinone (P H - PS - AQ) . Then , o xygen ( O) - H 2 SO 5 (PSA) - o zone (O 3 ) - a lkaline extr action (E) - a lkaline hydrogen peroxide (P) bleaching sequence was carried out while MPS showed significant effect on reduc ing HexA content. In addition, b rightness improvement and lower KN were a lso recorded while viscosity loss was bit h igh er . Ozone bleaching showed significant effects on the brightness deve lopment and KN reduction which one wa s also responsible to reduce HexA by 36 and 41% of both pulps , respectively. Experiment demonstrates tha t maximum brightness of 84 (kraft) and 82 (PH - PS - AQ) (% ISO) were achieved at peroxide . The optimu m tensile index was estimated at 19.3 and 22.7 (Nm/g) whereas tear index was r ecorded to be 4.3 and 3.3 (mN - m 2 /g) to kr aft and PH - PS - AQ, respectively. It coul d be concluded that PSA effectively removed HexA content and could use for industrial purposes with regard to economic and environmental considerations. |
| Year | 2014 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. PP-14-04 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| 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) | Shipin, Oleg V.;Ohi, Hiroshi |
| Examination Committee(s) | Nguyen Thi Kim Oanh;Anal, Anil Kumar |
| Scholarship Donor(s) | APP-AIT Graduate Scholarship |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2014 |