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The effect of Fenton chemistry on the production of microfibrillated cellulose - characterization and paper board application
(1Akzo Nobel Pulp and Performance Chemicals, SE-445 80 Bohus, Sweden)
(1Akzo Nobel Pulp and Performance Chemicals, SE-445 80 Bohus, Sweden)
3FSCN, Mid Sweden University, SE-851 70 Sundsvall, Sweden. (1Akzo Nobel Pulp and Performance Chemicals, SE-445 80 Bohus, Sweden)
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences. (2Karlstad University, Department of Chemical Engineering, SE-651 88 Karlstad, Sweden)
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2013 (English)Conference paper, Poster (Refereed)
Abstract [en]

A fully bleached birch (Betula verucosa) sulphate pulp was treated with acidic hydrogen peroxide in the presence of ferrous iron (i.e. Fenton's reagent) and thereafter treated mechanically in a colloid mill to produce microfibrillated cellulose (MFC). The produced MFCs were chemically and morphologically characterized and compared with MFCs produced with enzymatic (monocomponent endoglucanase) pre-treatment (Figure 1). As a reference MFC produced with only acid pre-treatment was also included in the study.

The Fenton pre-treatment increased the total charge of the fibres, decreased the viscosity and introduced new carbonyl groups. Addition of 10 and 50 kg/t hydrogen peroxide resulted in a yield loss of 2 and 4%, respectively. The enzymatic hydrolysis did not substantially change the total charge or the carbonyl group content of the pulp and did not release any organic material. The Fenton pre-treated pulps were easier to process mechanically, i.e. they reached a higher specific surface (BET) area and thereby a higher surface charge at a given mechanical treatment time, indicating a potential to reduce the energy demand in the final mechanical processing stage. The Fenton pre-treatment produced microfibrillated cellulose that in a water suspension (0.5% consistency) was stable with respect to sedimentation for at least eight weeks (Figure 2). Further, the Fenton pre-treatment gave a MFC product that contained a higher amount of small well fibrillated particles, as indicated by fractionation and scanning electron microscopy, compared with the enzymatic and acid pre-treatment methods studied.

Place, publisher, year, edition, pages
2013.
Keyword [en]
Microfibrillated cellulose, birch sulphate pulp, Fenton chemistry, enzymatic hydrolysis, carbonyl groups, total and surface charge, fractionation, suspension stability
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-31653OAI: oai:DiVA.org:kau-31653DiVA: diva2:703396
Conference
The Nordic Wood Biorefinery Workshop Chalmers october 2013
Projects
Akzo Nobel och VIPP FORSKARSKOLA: Values created in fibre-based processes and products
Available from: 2014-03-06 Created: 2014-03-06 Last updated: 2014-07-01Bibliographically approved

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Håkansson, HelenaGermgård, Ulf
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