The effect of Fenton chemistry on the production of microfibrillated cellulose - characterization and paper board application
2013 (English)Conference paper, Poster (Refereed)
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
Microfibrillated cellulose, birch sulphate pulp, Fenton chemistry, enzymatic hydrolysis, carbonyl groups, total and surface charge, fractionation, suspension stability
Research subject Chemical Engineering
IdentifiersURN: urn:nbn:se:kau:diva-31653OAI: oai:DiVA.org:kau-31653DiVA: diva2:703396
The Nordic Wood Biorefinery Workshop Chalmers october 2013
ProjectsAkzo Nobel och VIPP FORSKARSKOLA: Values created in fibre-based processes and products