EP 1010805 A1 20000621 - Calcium removal in pulping
Title (en)
Calcium removal in pulping
Title (de)
Entfernung von Calcium während der Zellstoffherstellung
Title (fr)
Enlèvement de calcium dans un procédé de production de pâte cellulosique
Publication
Application
Priority
EP 98850200 A 19981218
Abstract (en)
A process for removal of calcium from wood chips prior to chemical pulping in a kraft pulping process in order to prevent scaling in an evaporation process in the recovery area characterised in that the wood chips are treated with an aqueous solution of uncausticised spent cooking liquor from an evaporation process having at least 30% total solids whereafter the liquid is recycled to an evaporation process at a location where the uncausticised spent cooking liquor has at least 40% total solids.
IPC 1-7
IPC 8 full level
D21C 1/06 (2006.01); D21C 11/10 (2006.01)
CPC (source: EP)
D21C 1/06 (2013.01); D21C 11/106 (2013.01)
Citation (search report)
- [DXAY] US 5593544 A 19970114 - FAHLGREN CHRISTER [SE], et al
- [XA] US 4578149 A 19860325 - FAGERLUND BERTIL K E [SE]
- [A] US 3216788 A 19651109 - HOEFT JOHN E
- [Y] J.P.CASEY: "Pulp and Paper; Chemistry and Chemical Technology, 3rd edition, vol. I, 1980, pages 377-396, 454-459", JOHN WILEY & SONS, NEW YORK, XP002101042
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 98850200 A 19981218