2024-03-29T06:45:34Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00024711
2023-01-16T04:13:08Z
643:666:667
Behavioural analysis of a nonionic detergent in the kraft pulp washing process using cryo-time-of-flight secondary ion mass spectrometry and cryo-scanning electron microscopy
Tokugawa, Katsuhiro
Aoki, Dan
Asai, Ryutaro
Matsushita, Yasuyuki
Ishiguro, Masao
Noda, Yasufumi
Fukushima, Kazuhiko
open access
The final publication is available at Springer via https://doi.org/10.1007/s10086-017-1618-3
Cryo-TOF-SIMS
Imaging mass spectrometry
Kraft pulping
Detergent
Lignin
In order to understand the kraft pulp decolouring mechanism on using a nonionic detergent, the pulp washing process and the resulting pulp handsheets were investigated by examining the brightness, kappa number, thioacidolysis product yield, and dewatering efficiency in the pressing sheet making process. The pulp decolouring could be attributed to a decrease in the lignin content and an improvement in the dewatering efficiency. Furthermore, the detergent distribution in the aqueous pulp suspension obtained during the pulp washing process was visualised using cryo-time-of-flight secondary ion mass spectrometry/scanning electron microscopy (cryo-TOF-SIMS/SEM). The detergent was clearly observed at the transverse surface of the pulp fibre cell wall and was also detected in the lumen of the fibres, suggesting the permeation of the detergent into the pulp fibre cell wall. Based on these results, the pulp decolouring mechanism can be proposed as follows: the detergent permeates into the pulp fibre cell wall and promotes the solution-exchange between the inside and the outside parts of the fibre cell wall, finally washing away the chromophoric substances such as lignin and its degradation products owing to the enhanced dewatering efficiency.
Springer
2017-06
eng
journal article
AM
http://hdl.handle.net/2237/26933
https://nagoya.repo.nii.ac.jp/records/24711
https://doi.org/10.1007/s10086-017-1618-3
1435-0211
Journal of Wood Science
63
3
281
287
https://nagoya.repo.nii.ac.jp/record/24711/files/Journal_of_Wood_Science_63_3_281.pdf
application/pdf
410.5 kB
2018-06-01