EP 0905307 A1 19990331 - Method for applying ozone in ECF bleaching
Title (en)
Method for applying ozone in ECF bleaching
Title (de)
Verfahren zur Verwendung von Ozon im ECF-Bleichverfahren
Title (fr)
Procédé pour l'emploi de l'ozone dans un procédé de blanchiment de type ECF
Publication
Application
Priority
US 91723597 A 19970825
Abstract (en)
An ECF bleaching method for bleaching lignocellulosic materials (20) comprising a bleaching sequence of at least three sequential stages, said stages including an oxidative treatment stage (34), an alkaline extraction stage (42), and an acidification bleaching treatment stage (48) using ozone (70). A preferred process is shown in Fig. 4, which shows the bleaching sequence (10) of DEo(ZE)D. <IMAGE>
IPC 1-7
IPC 8 full level
D21C 9/10 (2006.01); D21C 9/153 (2006.01)
CPC (source: EP KR)
D21C 3/24 (2013.01 - KR); D21C 3/263 (2013.01 - KR); D21C 9/1057 (2013.01 - EP KR); D21C 9/153 (2013.01 - EP KR); D21C 9/16 (2013.01 - KR)
Citation (search report)
- [X] EP 0511695 A1 19921104 - EKA NOBEL AB [SE]
- [DX] WO 9118145 A1 19911128 - UNION CAMP CORP [US]
- [DX] US 4959124 A 19900925 - TSAI TED Y [US]
- [X] DE 4039099 A1 19910704 - KAMYR AB [SE]
Designated contracting state (EPC)
ES IT
DOCDB simple family (publication)
EP 0905307 A1 19990331; BR 9803217 A 19991103; CA 2245535 A1 19990225; CN 1209480 A 19990303; ID 23571 A 20000504; KR 19990023814 A 19990325
DOCDB simple family (application)
EP 98115927 A 19980824; BR 9803217 A 19980824; CA 2245535 A 19980824; CN 98118627 A 19980821; ID 981108 A 19980806; KR 19980034194 A 19980824