Process for producing high-purity azo dyes

Details Process for producing high-purity azo dyes Process for producing high-purity azo dyes

C - Chemistry, Metallurgy

09

B

C09B 41/00 (2006.01) C09B 67/54 (2006.01)

Patent

CA 2563811

A process for producing high-purity azo dyes is characterised in that (a) at least azo coupling is carried out in a micro-reactor; (b) the azo dye produced in the micro-reactor is brought into intimate contact with an organic solvent from the group of the C3-C6 alcohols, C4-C10 ether alcohols and halogenated aromatic compounds at a temperature from 0 to 60~C; and (c) the azo dye produced in the micro-reactor is subjected to membrane purification in an aqueous or solvent-containing suspension.

L'invention concerne un procédé de fabrication de colorants azo ultra-purs caractérisé en ce que (a) au moins un couplage azo est réalisé dans un microréacteur, (b) des colorants azo fabriqués dans le microréacteur sont mis en contact intime avec un solvant organique du groupe des C¿3?-C¿6?-alcools, des C¿4?-C¿10?-alcools d'éther et des composés aromatiques halogénés, à une température de 0 à 60 ·C, et (c) des colorants azo fabriqués dans le microréacteur sont soumis à une épuration membranaire dans une suspension aqueuse ou contenant des solvants.

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