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Development of environmentally clean bleaching processes maintaining high strength and brightness properties for different chemical pulps

Objective



. objective Explore the possibilites o
f activating* the lignin before bleach
ing in order to drastically reduce the
consumption of chlorine-based chemica
ls (especially elementary chlorine). B
ackground There is a need to decrease
the use of chlorine-based chemicals, e
specially elementary chlorine, in the
bleaching of softwood and hardwood kra
ft pulp, in order to decrease the envi
ronmental impact of bleach plant efflu
ents. The ultimate goal (> year 2000)
comprises bleaching without elementary
chlorine.
There are four major principles availa
ble: 1) Replacement of elementary chlo
rine with chlorine dioxide or other ch
emicals in the sequence 2) Removal and
/or activation of residual lignin befo
re bleaching 3) External treatment of
bleach plant effluents 4) Recycling of
bleach plant effluents to the chemica
l recovery for final destruction.
This project will concentrate on princ
iple 1) and 2). * Activation means a (
chemical) treatment of the pulp in suc
h a way that a subsequent bleaching st
age will give an increased removal of
lignin/bleaching as compared to a nonactivated bleaching.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Empresa Nacional de Celulosas SA
Address
8,Avenida De Burgos
28036 Madrid
Spain

Participants (6)

Centre Technique de l'Industrie des Papiers, Cartons et Celluloses
France
Address
Domaine Universitaire
38020 Grenoble
OY KESKUSLABORATORIO - CENTRALLABORATORIUM AB
Finland
Address
Tekniikantie 2
Espoo
PAPIERTECHNISCHE STIFTUNG
Germany
Address
Hess-strasse 134
Muenchen
Portucel-Empresa de Celulose e Papel de Portugal S.a.
Portugal
Address

3800 Aveiro
STFI-PACKFORSK AB
Sweden
Address
Drottning Kristinas Vaeg 61
Stockholm
École Française de Papeterie et des Industries Graphiques
France
Address
461 Rue De La Papeterie
38402 Saint-martin-d'hères