Method and apparatus for reducing vat and sulfur dyes

Details Method and apparatus for reducing vat and sulfur dyes Method and apparatus for reducing vat and sulfur dyes

D - Textiles, Paper

06

P

D06P 1/00 (2006.01) D06P 1/22 (2006.01) D06P 1/30 (2006.01) D06P 5/20 (2006.01)

Patent

CA 2318796

The invention relates to a method for the electrochemical reduction of vat and sulfur dyes in aqueous solutions, in steady-state conditions of reaction and a cycle which is largely free of reducing agents. The invention also relates to apparatus for carrying out said method. The steady-state conditions of reaction are obtained by means of a start reaction. The substances used for this reaction and the products resulting therefrom are extracted from the cycle. To maintain the cycle only dyes, an alkali and possibly small quantities of additional substances, such as surface-active agents, need to be added. No other chemicals active in the oxidation-reduction process are used.

L'invention concerne un procédé de réduction électrochimique de colorants de cuve et de colorants au soufre dans des solutions aqueuses, dans des conditions de réaction stationnaires et en une circulation exempte, dans une large mesure, d'agent de réduction, ainsi qu'un appareil permettant la mise en oeuvre de ce procédé. Les conditions de réaction stationnaires sont obtenues au moyen d'une réaction de départ. Les substances utilisées à cet effet et les produits résultants de leur réaction sont extraits de la circulation. Pour créer cette circulation on procède simplement à l'apport de colorants, d'alcali et, éventuellement, de faibles quantités d'additifs tels que des tensioactifs, mais l'on n'utilise aucun autre produit chimique jouant un rôle dans le processus d'oxydoréduction.

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