EP 0801169 B1 20010620 - Process for the delignification and bleaching of chemical paper pulp
Title (en)
Process for the delignification and bleaching of chemical paper pulp
Title (de)
Verfahren zur Entfernung von Lignin aus Chemie-Papierzellstoffen und zur Bleichung dieser Zellstoffe.
Title (fr)
Procédé de délignification et de blanchiment de pâtes à papier chimiques
Publication
Application
Priority
FR 9604611 A 19960412
Abstract (en)
[origin: EP0801169A1] The delignification and bleaching of a chemical paste comprises a pretreatment with a complexing or sequestering transition metal complex followed by treatment with hydrogen peroxide at a temperature T greater than 100 degrees C, a pressure greater than 1.5 times the pressure of saturated water vapour at temperature T and in the presence of a polymer with monomer units of formula -ÄC(R1)(R2)-C(OH)(COOM)Ü- (I) and/or (II) and in the presence of a compound A selected from potassium hydroxide, sodium hydroxide and alkali(ne earth) metal carbonates. In the formulae, R1, R2 = optionally different, H, 1-3C alkyl-group, M = H, ammonium group or alkali metal or alkaline earth metal.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
D21C 9/1036 (2013.01 - EP US); D21C 9/163 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FI FR GB SE
DOCDB simple family (publication)
EP 0801169 A1 19971015; EP 0801169 B1 20010620; CA 2200486 A1 19971012; CA 2200486 C 20020115; CN 1085756 C 20020529; CN 1167855 A 19971217; DE 69705255 D1 20010726; DE 69705255 T2 20011011; ES 2160300 T3 20011101; FR 2747407 A1 19971017; FR 2747407 B1 19980507; JP 3054378 B2 20000619; JP H1025685 A 19980127; NO 321519 B1 20060515; NO 971407 D0 19970325; NO 971407 L 19971013; US 6554958 B1 20030429
DOCDB simple family (application)
EP 97400497 A 19970304; CA 2200486 A 19970319; CN 97110338 A 19970408; DE 69705255 T 19970304; ES 97400497 T 19970304; FR 9604611 A 19960412; JP 9239197 A 19970410; NO 971407 A 19970325; US 84030597 A 19970411