EP 3464715 B1 20210728 - METHOD OF PRODUCING CHEMICAL PULP AT A DIGESTER PLANT OF A CHEMICAL PULP MILL
Title (en)
METHOD OF PRODUCING CHEMICAL PULP AT A DIGESTER PLANT OF A CHEMICAL PULP MILL
Title (de)
VERFAHREN ZUR HERSTELLUNG VON ZELLSTOFF IN EINER AUFSCHLUSSANLAGE EINER ZELLSTOFFFABRIK
Title (fr)
PROCÉDÉ DE PRODUCTION DE PÂTE CHIMIQUE AU NIVEAU D'UNE INSTALLATION DE LESSIVEUR D'UNE USINE DE PÂTE CHIMIQUE
Publication
Application
Priority
- FI 20165470 A 20160606
- FI 2017050408 W 20170601
Abstract (en)
[origin: WO2017212111A1] The present invention relates to a method of producing chemical pulp at a con¬ tinuous digester plant. The method comprises the following steps: a) leading a slurry formed of comminuted cellulosic fibrous material and liquid into a digester and treating the material with a treatment chemical at a temperature over 130 °C for producing treated material and black liquor; b) extracting at least one black liquor stream from the digester and leading the black liquor into an indirect heat exchange relationship with steam in a heat ex¬ changer for heating the black liquor; c) leading the heated black liquor into a flashing vessel, wherein flash steam and flashed black liquor are generated, and d) using flash steam from step c) for heating the fibrous material in the digester in step a).
IPC 8 full level
CPC (source: EP FI)
D21C 3/24 (2013.01 - FI); D21C 7/10 (2013.01 - EP FI); D21C 7/14 (2013.01 - EP)
Citation (opposition)
Opponent : Valmet AB
- US 2015284909 A1 20151008 - HUNT TYSON BRADFORD [US], et al
- DE 3621120 A1 19870115 - KAMYR AB [SE]
- US 3258390 A 19660628 - TOMLINSON II GEORGE H
- US 2010236733 A1 20100923 - TIKKA PETRI [FI], et al
- US 6306252 B1 20011023 - RYHAM ROLF C [US]
- US 2010224335 A1 20100909 - TIKKA PETRI [FI]
- WO 2015132469 A1 20150911 - ANDRITZ OY [FI]
- CRESLOW PUSTELNIK ET AL.: "The Mechanical-Chemical Pulping of Straw According to the Aronovsky Method", DEPARTMENT OF AGRICULTURE AND THE NATIONAL SCIENCE FOUNDATION, 1964, pages 1 - 40, XP055919060
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 2017212111 A1 20171214; EP 3464715 A1 20190410; EP 3464715 B1 20210728; ES 2896078 T3 20220223; FI 20165470 A 20171207; PT 3464715 T 20211102; UY 37275 A 20180131
DOCDB simple family (application)
FI 2017050408 W 20170601; EP 17739623 A 20170601; ES 17739623 T 20170601; FI 20165470 A 20160606; PT 17739623 T 20170601; UY 37275 A 20170605