Process for the preparation of low-salt, liquid dyestuff...

Details Process for the preparation of low-salt, liquid dyestuff... Process for the preparation of low-salt, liquid dyestuff...

C - Chemistry, Metallurgy

09

B

C09B 31/30 (2006.01) C09B 33/056 (2006.01) C09B 33/28 (2006.01) C09B 67/54 (2006.01) D06P 1/06 (2006.01) D06P 3/04 (2006.01) D06P 3/58 (2006.01) D21H 21/28 (2006.01)

Patent

CA 2202718

Process for the preparation of low-salt liquid dyestuff preparations, characterized in that they are obtained by: a) diazotization of an aromatic amine, b) 2-fold coupling of the diazo component obtained according to a) to I-acid-urea, in the presence of an inorganic base and in the absence of an organic base, c) desalination and, if appropriate, concentration by means of a pressure permeation of the reaction mixture obtained according to b), so that an inorganic salt content of less than 1% by weight is achieved.

Procédé pour obtenir des préparations de colorant liquide à faible teneur en sel, caractérisé par le fait qu'ils sont obtenus par : a) diazotation d'une amine aromatique, b) par couplage double du constituant diazo obtenu en a) à l'acide-urée I, en présence d'une base inorganique et en l'absence d'une base organique, c) élimination des sels et, au besoin, concentration par perméation sous pression du mélange réactionnel obtenu en b) de manière à obtenir une teneur en sel inorganique inférieure à 1 % en poids.

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