EP 0740015 B1 20000126 - Ethylenediaminetriacetic acid and salts thereof as chelating agents in pulp bleaching
Title (en)
Ethylenediaminetriacetic acid and salts thereof as chelating agents in pulp bleaching
Title (de)
Ethylendiamintriessigsäure und ihre Salze als chelatbildende Mittel für das Bleichen von Zellstoff
Title (fr)
L'acide éthylène diamine tri-acétique et les sels obtenus à partir de celui-ci comme agents de chélation dans le blanchiment de pâte
Publication
Application
Priority
US 43107895 A 19950427
Abstract (en)
[origin: EP0740015A1] A process for metal ion chelation in pulps. Extraction and removal of detrimental metal ions, preferentially manganese, iron and copper, prior to delignification and bleaching is carried out on pulp, preferably kraft pulp, using ethylenediaminetriacetic acid or ethylenediaminetriacetic acid salts as the chelating agent. Suitable salts include alkaline earth metal, alkali metal, ammonium and amine.
IPC 1-7
IPC 8 full level
CPC (source: EP)
D21C 9/1042 (2013.01); D21C 9/163 (2013.01)
Designated contracting state (EPC)
DE ES FI FR SE
DOCDB simple family (publication)
EP 0740015 A1 19961030; EP 0740015 B1 20000126; AU 5066896 A 19961107; AU 693011 B2 19980618; BR 9602035 A 19981006; CA 2173824 A1 19961028; DE 69606346 D1 20000302; DE 69606346 T2 20001019; ES 2144168 T3 20000601; ZA 963060 B 19960730
DOCDB simple family (application)
EP 96106367 A 19960423; AU 5066896 A 19960416; BR 9602035 A 19960424; CA 2173824 A 19960410; DE 69606346 T 19960423; ES 96106367 T 19960423; ZA 963060 A 19960417