EP 4139520 A1 20230301 - PROCESS AND APPARATUS FOR PRODUCING BLEACHED CELLULOSE
Title (en)
PROCESS AND APPARATUS FOR PRODUCING BLEACHED CELLULOSE
Title (de)
VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG VON GEBLEICHTEM ZELLSTOFF
Title (fr)
PROCÉDÉ ET APPAREIL DE PRODUCTION DE CELLULOSE BLANCHIE
Publication
Application
Priority
- DE 102020002445 A 20200423
- EP 2021056877 W 20210317
Abstract (en)
[origin: WO2021213740A1] In a process/an apparatus for producing bleached cellulose in which a lignin- and cellulose-containing suspension is subjected to at least one process step for oxygen-assisted bleaching in a reactor, such as alkaline oxygen delignification, oxygen-enhanced extraction or oxygen-enhanced peroxide bleaching, it is proposed according to the invention that the oxygen required for the oxygen-assisted bleaching is supplied to the reactor at least partially in the form of oxygen-containing nanobubbles. The small size and high stability of the nanobubbles allow uniform distribution of the oxygen in the suspension and a comparatively long exposure time. The efficiency of the bleaching is thus substantially increased.
IPC 8 full level
D21C 9/147 (2006.01); D21C 9/10 (2006.01)
CPC (source: EP US)
D21C 9/1036 (2013.01 - EP US); D21C 9/1057 (2013.01 - US); D21C 9/147 (2013.01 - EP US); D21C 9/163 (2013.01 - US)
Citation (search report)
See references of WO 2021213740A1
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
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DE 102020002445 A1 20211028; BR 112022021294 A2 20221227; CO 2022016641 A2 20230227; EP 4139520 A1 20230301; US 2023203751 A1 20230629; WO 2021213740 A1 20211028
DOCDB simple family (application)
DE 102020002445 A 20200423; BR 112022021294 A 20210317; CO 2022016641 A 20221118; EP 2021056877 W 20210317; EP 21713380 A 20210317; US 202117996473 A 20210317