TRANSITION METAL COMPLEXES WITH POLYDENTATE LIGANDS FOR ENHANCING THE BLEACHING AND DELIGNIFYING EFFECT OF PEROXO COMPOUNDS

摘要

This invention relates to transition metal complexcompounds of polydentate ligands with improveddelignifying and bleaching performance. These polydentateligands are organic ligands which, in aqueous solution andin the presence of atmospheric oxygen, or hydrogenperoxide, form a complex with a transition metal, inparticular cobalt, characterised in that the complexes aremono- or polynuclear and they have, when peroxo compoundsare used, better delignifying and bleaching performancesthan conventional transition metal complex compounds.A delignifying and bleaching method, in which thesetransition metal complex compounds with polydentateligands having improved delignifying and bleachingperformance are used as catalysts, is also described.