Multicomponent system for modifying, decomposing or...

Details Multicomponent system for modifying, decomposing or... Multicomponent system for modifying, decomposing or...

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 5/00 (2006.01)

Patent

CA 2271937

A multicomponent system for modifying, decomposing or bleaching lignin, lignin- containing materials or similar substances contains (a) if required at least one oxidation catalyst, (b) at least one appropriate oxidising agent, and (c) at least one mediator characterised in that it is selected from the group composed of hydroxypyridine, aminopyridine, hydroxyquinoline, aminoquinoline, hydroxyisoquinoline, aminoisoquinoline, with nitroso or mercapto substituents at the ortho or para position with respect to the hydroxy or amino groups. Also disclosed are tautomers of said compounds, as well as their salts, ethers and esters.

Ce système à composants multiples pour modifier, décomposer ou blanchir la lignine, des matériaux qui contiennent de la lignine ou des substances similaires contient (a) le cas échéant au moins un catalyseur de l'oxydation; (b) au moins un agent oxydant approprié et (c) au moins un médiateur qui se caractérise en ce qu'il est sélectionné dans le groupe constitué par l'hydroxypyridine, l'aminopyridine, l'hydroxyquinoline, l'aminoquinoline, l'hydroxyisoquinoline, l'aminoisoquinoline, avec des substituants nitroso ou mercapto en position ortho ou para par rapport aux groupes hydroxy ou amino. L'invention concerne également les tautomères de ces composés et leurs sels, éthers et esters.

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