EP 3129546 A4 20171115 - A METHOD OF DIGESTING CELLULOSE FIBROUS MATERIAL IN A CONTINUOUS DIGESTER
Title (en)
A METHOD OF DIGESTING CELLULOSE FIBROUS MATERIAL IN A CONTINUOUS DIGESTER
Title (de)
VERFAHREN ZUM AUFSCHLUSS VON CELLULOSEFASERMATERIAL IN EINEM KONTINUIERLICHEN FAULBEHÄLTER
Title (fr)
PROCÉDÉ DE LESSIVAGE DE MATÉRIAU FIBREUX DE CELLULOSE DANS UN LESSIVEUR EN CONTINU
Publication
Application
Priority
- US 201461976053 P 20140407
- IB 2015052419 W 20150402
Abstract (en)
[origin: WO2015155642A1] The invention discloses a method of continuous cooking cellulose fibrous material in a digester, said digester having a top and a bottom. The method of the invention comprises the steps of: -feeding a slurry comprising cellulosic fibrous material and cooking liquor into the top the digester, -feeding a first washing liquor into the bottom portion of the digester, which first washing liquor moves counter currently up through at least part of the digester, -removing pulp from the bottom of the digester, -feeding a second washing liquor into the center of the digester at least at the level of a first screen section, -feeding a third washing liquor into the center of the digester at the level of a second screen section, and -withdrawing the cooking liquor and the washing liquors from the first screen section and from the second screen section, which first screen section is arranged in a lower part of the digester and which second screen section is arranged below said first screen section. Thus, in accordance with the invention, a third washing liquor is added to the center of digester at the level of an additional, second extraction screen section arranged in the lower part of the digester. The method makes it possible to increase the production rate in the digester but still maintain or even increase the washing efficiency.
IPC 8 full level
D21C 3/24 (2006.01); D21C 7/00 (2006.01); D21C 7/14 (2006.01); D21C 9/02 (2006.01)
CPC (source: EP US)
D21C 3/24 (2013.01 - EP US); D21C 7/00 (2013.01 - EP US); D21C 7/14 (2013.01 - EP US); D21C 9/02 (2013.01 - EP US)
Citation (search report)
- [XI] WO 2005116327 A1 20051208 - METSO PAPER INC [FI], et al
- [A] US 2008295981 A1 20081204 - SHIN NAMHEE [US], et al
- [A] US 2008302492 A1 20081211 - SHIN NAMHEE [US], et al
- [A] US 3007839 A 19611107 - RICHTER JOHAN C F C
- [A] WO 9945191 A1 19990910 - AHLSTROM MACHINERY INC [US]
- See references of WO 2015155642A1
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)
WO 2015155642 A1 20151015; BR 112016023526 A2 20170815; CN 106164370 A 20161123; CN 106164370 B 20190118; EP 3129546 A1 20170215; EP 3129546 A4 20171115; US 2017022664 A1 20170126
DOCDB simple family (application)
IB 2015052419 W 20150402; BR 112016023526 A 20150402; CN 201580018554 A 20150402; EP 15776194 A 20150402; US 201515302212 A 20150402