EP 3882380 B1 20220427 - ONE STAGE METHOD FOR ACID METAL REMOVAL AND BLEACH
Title (en)
ONE STAGE METHOD FOR ACID METAL REMOVAL AND BLEACH
Title (de)
EINSTUFIGES VERFAHREN ZUR SAUREN METALLENTFERNUNG UND BLEICHUNG
Title (fr)
PROCÉDÉ D'ÉLIMINATION DE MÉTAL ET DE BLANCHIMENT EN UNE ÉTAPE AYANT LIEU EN MILIEU ACIDE
Publication
Application
Priority
EP 20163367 A 20200316
Abstract (en)
[origin: EP3882380A1] There is provided a process for chemically pretreating reclaimed cellulose fibres to be used in the production of moulded bodies from regenerated cellulose, wherein the pretreatment includes one stage, in which stage acid metal removal and acid oxidative bleaching are carried out together. Advantages include that the propensity of the regenerated cellulose to clog when flowing in a tube and through a nozzle is reduced. This is believed to be an effect of an efficient metal removal. The need for additional bleaching steps and/or metal removing steps is reduced or even eliminated. A one-stage method is more efficient, faster and less costly compared to a multi-stage method according to the prior art. From an environmental perspective, acidic metal removal is preferred over removal by chelating agents such as EDTA.
IPC 8 full level
D01F 2/00 (2006.01); D01F 2/06 (2006.01); D06M 11/11 (2006.01); D06M 11/34 (2006.01); D06M 11/50 (2006.01); D06M 13/184 (2006.01); D21C 9/02 (2006.01); D21C 9/10 (2006.01)
CPC (source: EP US)
D01F 2/00 (2013.01 - EP); D01F 2/06 (2013.01 - EP); D06M 11/11 (2013.01 - EP); D06M 11/34 (2013.01 - EP US); D06M 11/50 (2013.01 - EP US); D06M 13/184 (2013.01 - EP US); D21C 3/04 (2013.01 - EP); D21C 9/02 (2013.01 - EP); D21C 9/153 (2013.01 - EP); D21C 9/163 (2013.01 - EP); D21H 13/08 (2013.01 - EP); D01D 1/02 (2013.01 - EP); D06L 4/10 (2016.12 - EP); D06L 4/50 (2016.12 - EP); D06M 13/188 (2013.01 - EP); D06M 13/207 (2013.01 - EP US); D06M 2101/06 (2013.01 - EP 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
DOCDB simple family (publication)
EP 3882380 A1 20210922; EP 3882380 B1 20220427; CN 115210417 A 20221018; EP 4121584 A1 20230125; US 2023146394 A1 20230511; WO 2021185704 A1 20210923
DOCDB simple family (application)
EP 20163367 A 20200316; CN 202180018730 A 20210312; EP 2021056406 W 20210312; EP 21710332 A 20210312; US 202117909165 A 20210321