EP 0434662 B1 19940921 - Process for bleaching cellulosic materials and plant for carrying out the process.
Title (en)
Process for bleaching cellulosic materials and plant for carrying out the process.
Title (de)
Verfahren zum Bleichen von cellulosehältigen Materialien sowie Anlage zur Durchführung des Verfahrens.
Title (fr)
Procédé pour blanchir des matières cellulosiques et installation pour la mise en oeuvre de ce procédé.
Publication
Application
Priority
AT 292789 A 19891222
Abstract (en)
[origin: EP0434662A1] A process for bleaching cellulose-containing materials, in particular pulp, by means of ozone is characterised in that a solution of ozone in an aqueous medium (rich water) containing 30 to 300 g of O3, preferably 100 to 150 g of O3, per m<3> of aqueous medium is fed under pressure to the materials suspended in an aqueous medium and mixed in a mixing device (5) with the latter medium, thereupon the mixture is passed through a reaction vessel (7), the bleached material is separated from the bleaching liquor and any residual ozone which may be present is destroyed.
IPC 1-7
IPC 8 full level
D21C 9/153 (2006.01)
CPC (source: EP US)
D21C 9/153 (2013.01 - EP US)
Designated contracting state (EPC)
AT CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0434662 A1 19910626; EP 0434662 B1 19940921; AT 393701 B 19911210; AT A292789 A 19910515; AT E111989 T1 19941015; DE 59007258 D1 19941027; US 5133946 A 19920728
DOCDB simple family (application)
EP 90890325 A 19901217; AT 292789 A 19891222; AT 90890325 T 19901217; DE 59007258 T 19901217; US 62601290 A 19901212