EP 0717800 A1 19960626 - MEDIUM CONSISTENCY OZONE BRIGHTENING OF HIGH CONSISTENCY OZONE BLEACHED PULP
Title (en)
MEDIUM CONSISTENCY OZONE BRIGHTENING OF HIGH CONSISTENCY OZONE BLEACHED PULP
Title (de)
MITTLERES KONSISTENZ-OZONBLEICHEN VON HOCHKONSISTENZ-OZONGEBLEICHTEM ZELLSTOFF
Title (fr)
BLANCHIMENT D'UNE P TE A PAPIER A CONCENTRATION MOYENNE AVEC DE L'OZONE, APRES DECOLORATION DE CETTE P TE A HAUTE CONCENTRATION AVEC DE L'OZONE
Publication
Application
Priority
- US 9410050 W 19940901
- US 11677693 A 19930903
Abstract (en)
[origin: WO9506773A1] A process for delignifying and bleaching a lignocellulosic material (2) without the use of elemental chlorine or chlorine-containing compounds by forming (4) a pulp, oxygen delignifying (40) the pulp and thereafter further delignifying the oxygen delignified pulp by lifting, displacing and tossing the pulp in a radial direction while advancing it in an axial direction in a plug fow-like manner with an effective amount of ozone (88) for a sufficient time to obtain a substantially delignified pulp having a GE brightness of at least about 35 %. The substantially delignified pulp may then be brightened to a final product by treating the pulp with a brightening stage peroxide compound, followed by subsequently treating the pulp at low to medium consistency with ozone.
IPC 1-7
IPC 8 full level
D21C 9/10 (2006.01); D21C 9/147 (2006.01); D21C 9/153 (2006.01); D21C 9/16 (2006.01)
CPC (source: EP SE)
D21C 9/1057 (2013.01 - EP); D21C 9/147 (2013.01 - EP); D21C 9/153 (2013.01 - EP SE); D21C 9/163 (2013.01 - EP); D21C 9/163 (2013.01 - SE)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT
DOCDB simple family (publication)
WO 9506773 A1 19950309; AU 7721694 A 19950322; BR 9407457 A 19961112; CA 2170733 A1 19950309; EP 0717800 A1 19960626; EP 0717800 A4 19981028; FI 960973 A0 19960301; FI 960973 A 19960430; SE 9600773 D0 19960228; SE 9600773 L 19960418; ZA 946807 B 19950628
DOCDB simple family (application)
US 9410050 W 19940901; AU 7721694 A 19940901; BR 9407457 A 19940901; CA 2170733 A 19940901; EP 94928024 A 19940901; FI 960973 A 19960301; SE 9600773 A 19960228; ZA 946807 A 19940905