EP 0810321 A1 19971203 - Batch process for preparing improved kraft pulp
Title (en)
Batch process for preparing improved kraft pulp
Title (de)
Diskontinuierliches Verfahren zur Herstellung von verbesserten Kraft-Zellstoffen
Title (fr)
Procédé en discontinu pour préparation des pâtes kraft ameliorées
Publication
Application
Priority
FI 962260 A 19960530
Abstract (en)
An improved batch process for preparing kraft pulp is disclosed, wherein a portion of green liquor or a derivative thereof is introduced in the impregnation or/and pretreatment stage. The derivative may be mother liquor originating from crystallization of carbonate from green liquor. The procedure facilitates the use of mild conditions in the final cooking stage and short cooking periods and results in higher pulp quality, high production output and good maintenance of the balance of chemicals in the mill. <IMAGE>
IPC 1-7
IPC 8 full level
D21C 3/02 (2006.01); D21C 3/22 (2006.01); D21C 3/26 (2006.01); D21C 11/00 (2006.01)
CPC (source: EP)
D21C 3/02 (2013.01); D21C 3/22 (2013.01); D21C 11/0064 (2013.01)
Citation (search report)
- [YD] EP 0520452 A1 19921230 - SUNDS DEFIBRATOR PORI OY [FI]
- [YP] CA 2169108 A1 19960809 - KAMYR INC [US]
- [A] EP 0687766 A1 19951220 - AHLSTROEM OY [FI]
- [A] WO 9409204 A1 19940428 - CAUSTEC AB [SE], et al
- [AD] VARDHEIM, S.: "The Use of Green Liquor as Cooking Liqour in the Production of Semi-Chemical Hardwood Pulps for Fluting.", PAPERI JA PUU, no. 9, 1967, pages 613 - 619, XP002042321
- [A] DATABASE WPI Section Ch Week 8038, Derwent World Patents Index; Class F09, AN 80-66836C, XP002042322
Designated contracting state (EPC)
AT DE ES FR PT SE
DOCDB simple family (publication)
EP 0810321 A1 19971203; EP 0810321 B1 20010613; AT E202167 T1 20010615; AU 2016297 A 19971204; AU 721440 B2 20000706; BR 9703156 A 19981027; CA 2203096 A1 19971130; CA 2203096 C 20050628; CN 1109160 C 20030521; CN 1170795 A 19980121; DE 69705160 D1 20010719; DE 69705160 T2 20020516; ES 2159385 T3 20011001; FI 105929 B 20001031; FI 962260 A0 19960530; FI 962260 A 19971201; ID 18445 A 19980409; JP H1053989 A 19980224; NO 972456 D0 19970529; NO 972456 L 19971201; NZ 314898 A 19980626; PT 810321 E 20011031; RU 2128259 C1 19990327; ZA 973887 B 19980225
DOCDB simple family (application)
EP 97660041 A 19970416; AT 97660041 T 19970416; AU 2016297 A 19970509; BR 9703156 A 19970514; CA 2203096 A 19970418; CN 97113050 A 19970529; DE 69705160 T 19970416; ES 97660041 T 19970416; FI 962260 A 19960530; ID 971703 A 19970521; JP 15815697 A 19970530; NO 972456 A 19970529; NZ 31489897 A 19970526; PT 97660041 T 19970416; RU 97108781 A 19970529; ZA 973887 A 19970506