Treatment of dye baths by a membrane process for the purpose...

C - Chemistry – Metallurgy – 09 – B

Patent

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C09B 67/00 (2006.01) B01D 61/02 (2006.01) B01D 61/58 (2006.01) C02F 1/44 (2006.01) C02F 9/02 (2006.01)

Patent

CA 2497352

The present invention relates to a process for the treatment and the recovery in value of baths for the dyeing of cellulose fibres with reactive dyes comprising a prefiltration, a neutralization, a nanofiltration and a reverse osmosis. The following are reused at the end of the treatment: on the one hand, colourless water comprising the inorganic salts necessary for a new dyeing with reactive dyes; on the other hand, pure water which will be used either during the nanofiltration or for other operations, such as washing or rinsing the dyed material. Furthermore, an aqueous solution of very low volume, mainly comprising hydrolysed reactive dyes and dye additives, is recovered. This results in savings in water, in a drastic reduction in the salinity of the effluents and in a simplification in the treatment of the effluents originating from the other baths necessary for the processing of cotton dyed with reactive dyes, in short in a significant reduction in pollution of the environment.

La présente invention concerne un processus de traitement et de récupération sur le plan de la valeur de bains de teinture de fibres de cellulose au moyen de colorants réactifs, ledit processus comprenant une préfiltration, une neutralisation, une nanofiltration et une osmose inversée. A la fin du traitement, les éléments suivants sont réutilisés: d'une part, de l'eau exempte de couleur renfermant les sels inorganiques nécessaires à une nouvelle coloration à l'aide de colorants réactifs, d'autre part, de l'eau pure utilisée soit pendant la nanofiltration soit pour d'autres opérations, telles que le lavage ou le rinçage de la matière colorée. En outre, une solution aqueuse de très petit volume, contenant principalement des colorants réactifs hydrolysés et des additifs de colorants est récupérée. Ceci permet d'économiser de l'eau, de diminuer drastiquement la salinité des effluents et de simplifier le traitement des effluents provenant des autres bains nécessaires au traitement de coton coloré avec des colorants réactifs, en bref, de diminuer considérablement la pollution de l'environnement.

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