4-Acetamido-Tempo-mediated oxidation of wood chips and thermomechanical pulp in large scale

Myja, D., Loranger, E. et Lanouette, R. (2019). 4-Acetamido-Tempo-mediated oxidation of wood chips and thermomechanical pulp in large scale. Industrial and Engineering Chemistry Research, 58 (28). pp. 12723-12728. ISSN 0888-5885 DOI 10.1021/acs.iecr.9b02049

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Résumé

The 2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation was mainly studied in laboratory scale and needs to be scaled-up for any future industrial implantation. With this objective, the oxidation was applied at several steps in a thermomechanical pulp production system. Softwood chips were impregnated with a TEMPO mixture or treated in batch before refining, leading to a modification of pulp mechanical and optical properties. The TEMPO oxidation was also studied on softwood pulp with a usual batch oxidation, a high consistency treatment or by replacing the diluted water by a TEMPO oxidation medium during the secondary refining. Pulp from high-consistency oxidation presented a significant energy potential gain. However, optical properties were severely affected and could not be totally recovered by a conventional hydrogen peroxide bleaching. The refiner was also used as a nanofiber-producing apparatus for pulp with carboxylic group content higher than 1500 mmol/kg. For this application, the refiner appeared to be a high-efficiency dispersion system to produce significant amounts of nanofibers at low-energy consumption. © 2019 American Chemical Society.

Type de document:	Article
Mots-clés libres:	energy utilization nanofibers optical properties oxidation refining softwoods thermomechanical pulp thermomechanical pulping process wood products 2 ,2 ,6 ,6-Tetramethylpiperidine-1-oxyl carboxylic group dispersion systems hydrogen peroxide bleaching low energy consumption pulp production system secondary refining thermo-mechanical pulp refining chips high Consistency pulps
Date de dépôt:	01 juill. 2021 12:29
Dernière modification:	01 juill. 2021 12:29
Version du document déposé:	Post-print (version corrigée et acceptée)
URI:	https://depot-e.uqtr.ca/id/eprint/9639

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