EP 2479342 A1 20120725 - Ozone bleaching of pulp

Title (en)

Ozone bleaching of pulp

Title (de)

Ozonbleichung von Pulpe

Title (fr)

Blanchiment d'ozone de pulpe

Publication

EP 2479342 A1 20120725 (EN)

Application

EP 12150702 A 20120111

Priority

SE 1150015 A 20110112

Abstract (en)

The following invention relates to a method for bleaching of organic fibers comprising the steps of providing an aqueous suspension comprising organic fibers comprising lignin compounds, directing an ozone rich oxygen gas through said suspension for causing a substantial bleaching of said lignin compounds, providing carbon dioxide (CO 2 ) into said suspension, and reacting said carbon dioxide (CO 2 ) with ozonide radical anions (O3 €¢- ) produced as a result of said ozone bleaching and present in the suspension, for formation of oxygen (O 2 ) and carbonate radicals (CO 3 €¢- ) within the suspension.

IPC 8 full level

D21C 9/153 (2006.01)

CPC (source: EP SE)

D21C 9/153 (2013.01 - EP SE); D21C 9/1036 (2013.01 - EP); D21C 9/1063 (2013.01 - EP)

Citation (applicant)

M. RAGNAR ET AL.: "Radical formation in ozone reactions with lignin and carbohydrate model compounds", HOLZFORSCHUNG, vol. 53, no. 4, 1999, pages 292 - 298
"A new mechanism in the ozone reaction with lignin-like structures", HOLZFORSCHUNG, vol. 53, no. 4, pages 423 - 428
NEMES ET AL.: "Kinetics and Mechanism of the Carbonate ion Inhibited Aqueous Ozone Decomposition", J.PHYS. CHEM. A, vol. 104, no. 34, 2000, pages 7995 - 8000
"Advanced oxidation technologies for the pulp industry. - An investigation on the delignifying properties of the carbonate radical anion", 2004, ROYAL INSTITUTE OF TECHNOLOGY
S.V. LYMAR; J.K. HURST: "Rapid Reaction between Peroxynitrite Ion and Carbon Dioxide", J.AM. CHEM. SOC., vol. 117, 1995, pages 8867 - 8858
G. MERÉNYI ET AL.: "Peroxynitrous Acid Homolysis into OH and N02 Radicals", CHEM RES. TOXICOL., vol. 11, 1998, pages 712 - 713
J. STAEHELIN; J. HOIGNÉ: "Decomposition of Ozone in Water in the Presence of Organic Solutes Acting as Promoters and Inhibitors of Radical Chain Reactions", ENVIRON. SCI. TECHNOL., vol. 19, 1985, pages 1208 - 1213
LATIMER; HILDEBRANT: "Reference Book of Inorganic Chemistry 3rd Ed.", MACMILLAN, pages: 285

Citation (search report)

[X] US 2010175839 A1 20100715 - TIGERSTROM ANNA [SE]
[X] WO 0175220 A1 20011011 - AGA AB [SE], et al
[X] WO 0073576 A1 20001207 - AGA AB [SE], et al
[A] US 2009000751 A1 20090101 - YIN CAIFANG [US]
[A] WO 0047812 A1 20000817 - KIRAM AB [SE], et al
[A] WO 0225008 A1 20020328 - METSO PAPER INC [FI], et al
[A] EP 0526383 A1 19930203 - UNION CAMP PATENT HOLDING [US]

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 2479342 A1 20120725; SE 1150015 A1 20120713

DOCDB simple family (application)

EP 12150702 A 20120111; SE 1150015 A 20110112