EP 0535741 A1 19930407 - Process for improving the selectivity in the delignification of a chemical pulp.
Title (en)
Process for improving the selectivity in the delignification of a chemical pulp.
Title (de)
Verfahren zur Verbesserung der Selektivität bei der Delignifizierung von chemischem Zellstoff.
Title (fr)
Procédé pour l'amélioration de la sélectivité de la délignification d'une pâte à papier chimique.
Publication
Application
Priority
- US 77085991 A 19911004
- US 94283892 A 19920910
Abstract (en)
Process for improving the selectivity of the delignification of a chemical paper pulp by means of an organic peroxyacid, according to which the unbleached pulp originating from the cooking operation is treated with an aqueous solution of this organic peroxyacid, the treatment being carried out at a temperature of between 2 and 47 DEG C.
Abstract (fr)
Procédé pour l'amélioration de la sélectivité de la délignification d'une pâte à papier chimique au moyen d'un peroxyacide organique selon lequel on traite la pâte écrue provenant de l'opération de cuisson par une solution aqueuse de ce peroxyacide organique et que l'on opère le traitement à une température comprise entre 2 et 47° C.
IPC 1-7
IPC 8 full level
D21C 9/16 (2006.01); D21C 3/02 (2006.01); D21C 3/04 (2006.01); D21C 5/00 (2006.01); D21C 9/10 (2006.01); D21H 17/23 (2006.01)
IPC 8 main group level
D21C (2006.01)
CPC (source: EP)
D21C 9/1005 (2013.01); D21C 9/166 (2013.01)
Citation (search report)
- [X] FR 1014536 A 19520818 - DU PONT
- [A] ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, vol. 53, no. 4, Octobre 1982, APPLETON (US) page 499, YOTSUYA, M. et al.: "Bleaching of pulp with peroxide"
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0535741 A1 19930407; EP 0535741 B1 19980708; AT E168149 T1 19980715; AU 2538292 A 19930422; AU 660326 B2 19950622; DE 69226143 D1 19980813; DE 69226143 T2 19990225; EP 0844328 A2 19980527; EP 0844328 A3 19980715; ES 2120984 T3 19981116; FI 924448 A0 19921002; FI 924448 A 19930405; JP H05195467 A 19930803; NZ 244592 A 19940225; PL 171990 B1 19970731; PL 296122 A1 19930628
DOCDB simple family (application)
EP 92202952 A 19920925; AT 92202952 T 19920925; AU 2538292 A 19920928; DE 69226143 T 19920925; EP 97122629 A 19920925; ES 92202952 T 19920925; FI 924448 A 19921002; JP 26632192 A 19921005; NZ 24459292 A 19921002; PL 29612292 A 19921001