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JSIR Vol.66 [2007] >
JSIR Vol.66(10) [October 2007] >
| Title: | Evaluation of cooking processes for Trema orientalis pulping |
| Authors: | Jahan, M Sarwar
Rubaiyat, A
Sabina, R |
| Keywords: | Trema orientalis
Fast growing wood
ASAM process
Pulp yield
Delignification
Bleachability |
| Issue Date: | Oct-2007 |
| Publisher: | CSIR |
| IPC Code: | D21D1/00 |
| Abstract: | Chemical and morphological properties support Trema orientalis as a new source for pulping (yield, 46-52%).
Using soda, soda-anthraquinone (AQ), kraft, alkaline-sulfite-anthraquinone-methanol (ASAM), acetic acid (AA) and formic
acid (FA) pulping processes, ASAM pulp (yield, 51.7 %; kappa number, 13.4) showed excellent initial brightness (53.2 %),
which indicated better bleachability. Prebleaching of pulps by oxygen, peroxyaid and xylanase treatments, indicated
O₂-prebleaching reduced kappa number (44-53%). Prebleached pulps were bleached in Chlorine dioxide-Extraction-Chlorine
dioxide (DED) and Chelation-Peroxie-Peroxide (QPP) bleaching sequences. ASAM and kraft pulps exhibited better brightness
than soda-AQ pulp. Viscosity of bleached pulp from kraft process was lower than that of soda-AQ and ASAM processes.
Strength properties of pulps from soda, soda-AQ, kraft and ASAM processes were acceptable. The a-cellulose (> 94 %) in FA
pulp suggests further study for dissolving pulp. |
| Page(s): | 853-859 |
| ISSN: | 0022-4456 |
| Source: | JSIR Vol.66(10) [October 2007]
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