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

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 proc...

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Bibliographic Details
Published in:Journal of wood science 2017-06, Vol.63 (3), p.281-287
Main Authors: Tokugawa, Katsuhiro, Aoki, Dan, Asai, Ryutaro, Matsushita, Yasuyuki, Ishiguro, Masao, Noda, Yasufumi, Fukushima, Kazuhiko
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Characterization and Evaluation of Materials
Decoloring
Efficiency
Ions
Kraft pulp
Life Sciences
Lignin
Mass spectrometry
Materials Science
Original Article
Scanning electron microscopy
Scientific imaging
Secondary ion mass spectrometry
Spectroscopy
Washing
Wood Science & Technology
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Summary: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.
ISSN:1435-0211
1611-4663
DOI:10.1007/s10086-017-1618-3