Open AccessCHLORINE DIOXIDE BLEACHING OF PULP FROM CROP RESIDUES: BAGASSE, KASH AND CORN STALKS
Author(s) -
Taslima Ferdous,
Md. Imran Hossain,
Moumita Nanjiba,
M. A. Quaiyyum,
M. Sarwar Jahan
Publication year - 2021
Publication title -
cellulose chemistry and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.302
H-Index - 32
eISSN - 2457-9459
pISSN - 0576-9787
DOI - 10.35812/cellulosechemtechnol.2021.55.28
Subject(s) - kappa number , chemistry , pulp (tooth) , stalk , bagasse , chlorine dioxide , pulp and paper industry , effluent , nuclear chemistry , kraft process , horticulture , environmental engineering , environmental science , organic chemistry , medicine , pathology , kraft paper , biology , engineering
"This investigation describes the effect of hot chlorine dioxide delignification (DHT) of bagasse, kash and corn stalkpulps on pulp properties and effluent quality. The pulps were subjected to DHT at 85 °C for 45 min and the results werecompared with those of the D0 process carried out at 70 °C for 45 min. The kappa numbers after the alkaline extraction(Ep) stage in DHT bleaching were always lower and brightness was higher, compared to the corresponding parametersin D0 bleaching, without impacting pulp viscosity. The final brightness of the corn stalk pulp was 84.8% at a kappafactor of 0.25 in the D0 process, while in the DHT process, the same type of pulp reached the brightness of 87.2% at akappa factor of 0.15, saving 40% ClO2 in the first stage. Similarly, kash pulp exhibited 90% brightness at a kappafactor of 0.15, which also saved 40% ClO2, compared to the conventional D0 process. The brightness of bagasse pulp inDHT and D0 processes was almost similar. Oxygen delignified pulp had a lower effluent discharge than unbleachedpulps in subsequent ECF bleaching. The COD value in DHT was lower than that in D0."