System of chemicals and method for deinking of waste paper

D - Textiles – Paper – 21 – C

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D21C 5/02 (2006.01)

Patent

CA 2247281

Chemical system that makes it possible in a cost effective and environmentally friendly way to deink waste paper at a lower pH than required in present methods, but with retained efficiency and quality. This has been obtained by a chemical system comprising the following components: a) a surface-active ester to release the printing-ink from the pulp fibers, b) a polyester based collector for aggregation and flotation of released printing-ink particles. The system may also contain an inhibitor for hydrogen peroxide decomposing enzymes, such as peroxidase and catalase.

Système chimique permettant de désencrer le papier de récupération de manière économique et non nocive pour l'environnement, sous un pH plus faible que ce que ne prévoient les procédés actuels mais avec les mêmes caractéristiques d'efficacité et de qualité. Ce résultat est obtenu avec un système chimique comprenant les composants suivants: a) un ester à action superficielle permettant de libérer l'encre d'impression des fibres de pulpe; b) un collecteur à base de polyester assurant l'aggrégation et la flottation des particules d'encre d'impression qui ont été libérées. Le système peut également prévoir un inhibiteur pour les enzymes décomposant le peroxide d'hydrogène, comme la peroxidase et la catalase.

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