Hexenuronic acid removal from unbleached kraft eucalyptus pulp by peroxymonosulfuric acid

Simple item page
dc.contributor.authorPetit-Breuilh, X.
dc.contributor.authorZaror, C.
dc.contributor.authorMelo, R.
dc.date2004
dc.date.accessioned2012-02-29T02:51:25Z
dc.date.available2012-02-29T02:51:25Z
dc.date.issued2012-02-28
dc.description.abstractThe use of peroxymonosulphuric (Ps) acid to remove hexenuronic acid (HexA) present in unbleached eucalyptus kraft pulps was evaluated here. HexA is formed during pulping and is held responsible for reagent consumption during bleaching. Laboratory experiments, using oxygen predelignified eucalyptus kraft pulps (kappa number around 9), treated at 20-110°C and 0.2-1.0%Ps, were conducted here, Experimental results show that Ps effectively removed both HexA and lignin, even under mild conditions. Selectivity towards HexA increased at higher temperature and lower Ps loads. However, at lower temperatures and higher Ps concentrations, cellulose was also attacked. As a result of Ps pre-treatment, ClO2 savings in pulp bleaching in the range 40-79% were determined here. Moreover, all Ps pretreated pulps yielded higher brightness than untreated pulps. Furthermore, lower AOX emissions occurred as a result of lower ClO 2 loads. However, moderate Ps pre-treatment conditions were necessary to obtain a bleached pulp with acceptable mechanical properties. Results reported here show that HexA removal by Ps offers an interesting option for industrial implementation, both from an economic and environmental point of view.es
dc.formatPDFes
dc.identifier.citationJournal of the Chilean Chemical Society, Vol.49, N°4, 355-360, 2004es
dc.identifier.doi10.4067/S0717-97072004000400016es
dc.identifier.urihttps://repositoriodigital.uct.cl/handle/10925/797
dc.language.isoenes
dc.sourceJournal of the Chilean Chemical Societyes
dc.subjectCelulosaes
dc.subjectEucalyptuses
dc.subjectÁcido sulfúricoes
dc.titleHexenuronic acid removal from unbleached kraft eucalyptus pulp by peroxymonosulfuric acides
dc.typeArtículo de Revistaes
uct.carreraIngeniería en Recursos Naturales Renovableses
uct.carreraIngeniería Forestales
uct.catalogadorjmges
uct.comunidadRecursos Naturaleses
uct.facultadFacultad de Recursos Naturaleses
uct.indizacionScieloes
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
hexenuronic_petit.pdf
Size:
208.78 KB
Format:
Adobe Portable Document Format
Description:
Artículo
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
803 B
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Medio Ambiente