Process for the preparation of concentrated storage- stable...

Details Process for the preparation of concentrated storage- stable... Process for the preparation of concentrated storage- stable...

C - Chemistry, Metallurgy

09

B

260/154, 8/22, 2

C09B 44/02 (2006.01) C09B 56/04 (2006.01) C09B 67/26 (2006.01) C09B 69/04 (2006.01) D06P 1/06 (2006.01)

Patent

CA 1251786

A process for the preparation of concentrated storage-stable aqueous solutions of yellow azo- and azoxystilbene dyes Abstract of the Disclosure The invention relates to a process for the preparation of concentrat- ed storage-stable aqueous solutions of yellow azo- and azoxystilbene dyes which are obtained by self-condensation of 4-nitrotoluene-2- sulfonic acid in the presence of an alkali metal hydroxide, by converting the sparingly soluble alkali metal salt of the dye into a water-soluble ammonium salt by double cation exchange via a lipophilic ammonium salt, which process comprises carrying out the double ion exchange in a two-phase system of nitrobenzene/water and using, for the first ion exchange a di- or trialkylamine containing a total of 12 to 40 carbon atoms and, for the second ion exchange, a mono-, di- or trialkanolamine containing 2 to 4 carbon atoms in each alkyl moiety. The concentrated storage-stable dye solutions so obtained are particularly suitable for dyeing paper.

494955

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