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DUGi: Ítem | Recercat - Low environmental impact bleaching sequences for attaining high brightness level with eucalyptus SPP pulp

Ítem


Low environmental impact bleaching sequences for attaining high brightness level with eucalyptus SPP pulp

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

Associação Brasileira de Engenharia Química

Autor: Costa, M.M.
Santos, C.A.
García, J.C.
Barberà, L.
Vilaseca Morera, Fabiola
Pèlach Serra, Maria Àngels
Mutjé Pujol, Pere
Colodette, J.L.
Resum: 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
Accés al document: http://hdl.handle.net/2072/220398
Llenguatge: eng
Editor: Associação Brasileira de Engenharia Química
Drets: Attribution-NonCommercial 3.0 Spain
URI Drets: http://creativecommons.org/licenses/by-nc/3.0/es/
Matèria: Cel·lulosa
Cellulose
Paper -- Blanqueig
Paper -- Bleaching
Títol: Low environmental impact bleaching sequences for attaining high brightness level with eucalyptus SPP pulp
Tipus: info:eu-repo/semantics/article
Repositori: Recercat

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