Low environmental impact bleaching sequences for attaining high brightness level with eucalyptus SPP pulp
dc.contributor.author
dc.date.accessioned
2013-11-22T12:53:12Z
dc.date.available
2013-11-22T12:53:12Z
dc.date.issued
2009
dc.identifier.issn
0104-6632
dc.identifier.uri
dc.description.abstract
The alternatives used for minimizing the usage of chlorine dioxide in bleaching sequences included a hot acid hydrolysis (Ahot) stage, the use of hot chlorine dioxide (Dhot) and ozone stages at medium consistency and high consistency (Zmc and Zhc), in addition to stages with atmospheric hydrogen peroxide (P) and pressurized hydrogen peroxide (PO). The results were interpreted based on the cost of the chemical products, bleaching process yields and on minimizing the environmental impact of the bleaching process. In spite of some process restrictions, high ISO brightness levels were kept around 90 % brightness. Additionally, the inclusion of stages like acid hydrolysis, pressurized peroxide and ozone in the bleaching sequences provided an increase in operating flexibility, aimed at reducing environmental impact (ECF Light). The Dhot(EOP)D(PO) sequence presented lower operating cost for ISO brightness above 92 %. However, this kind of sequence was not allowed for closing the wastewater circuit, even partially. For ISO brightness level around 91%, the AhotZhcDP sequence presented a lower operating cost than the others
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Associação Brasileira de Engenharia Química
dc.relation.isformatof
Reproducció digital del document publicat a: http://dx.doi.org/10.1590/S0104-66322009000100002
dc.relation.ispartof
Brazilian Journal of Chemical Engineering, 2009, vol. 6, núm.1, p.11 - 22
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Articles publicats (D-EQATA)
dc.rights
Attribution-NonCommercial 3.0 Spain
dc.rights.uri
dc.subject
dc.title
Low environmental impact bleaching sequences for attaining high brightness level with eucalyptus SPP pulp
dc.type
info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/openAccess
dc.embargo.terms
Cap
dc.type.version
info:eu-repo/semantics/publishedVersion
dc.identifier.doi
dc.identifier.idgrec
010627