EP 0882152 A1 19981209 - PROCESS FOR BLEACHING OF A HIGH YIELD PULP
Title (en)
PROCESS FOR BLEACHING OF A HIGH YIELD PULP
Title (de)
VERFAHREN ZUM BLEICHEN VON HOCHAUSBEUTEPAPIERZELLSTOFF
Title (fr)
PROCEDE DE BLANCHIMENT DE PATE HAUT RENDEMENT
Publication
Application
Priority
- FI 9700107 W 19970219
- FI 960757 A 19960219
Abstract (en)
[origin: WO9730209A1] A process for the bleaching of a high yield pulp, in which process, before peroxide bleaching, the pulp is pretreated with a chelating agent in order to eliminate the adverse effects of the heavy metals present in the pulp. The chelating agent used consists of compounds according to Formula (I) where n is 1-3, m is 0-3, p is 1-3, R1, R2, R3 and R4 are H, Na, K, Ca or Mg, and R5 and R6 are H, CH2OH, CH2CH2OH or CH2O(CH2CH2O)1-10CH2CH2OH.
IPC 1-7
IPC 8 full level
CPC (source: EP)
D21C 9/1042 (2013.01); D21C 9/16 (2013.01)
Citation (search report)
See references of WO 9730209A1
Designated contracting state (EPC)
DE FR GB NL SE
DOCDB simple family (publication)
WO 9730209 A1 19970821; AU 1797497 A 19970902; DE 69731617 D1 20041223; DE 69731617 T2 20050331; EP 0882152 A1 19981209; EP 0882152 B1 20041117; FI 115642 B 20050615; FI 960757 A0 19960219; FI 960757 A 19970820
DOCDB simple family (application)
FI 9700107 W 19970219; AU 1797497 A 19970219; DE 69731617 T 19970219; EP 97903409 A 19970219; FI 960757 A 19960219