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Yellow azo and the storage stability which the azokishisuchiruben dye concentrates manufacturing method null
Yellow azo and the storage stability which the azokishisuchiruben dye concentrates manufacturing method null
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机译:黄偶氮及其偶氮基异丁烯染料浓缩的贮藏稳定性无效
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摘要
The process for preparing concentrated stable aqueous solutions of yellow stilbeneazo(xy) dyes which are obtained by self-condensation of 4-nitrotoluene-2-sulphonic acid in alkali metal hydroxide solution by conversion of the sparingly soluble alkali metal dye salt by double cation exchange via a lipophilic ammonium salt into a water-soluble alkanolammonium salt is characterised in that the double ion exchange is carried out in a 2-phase system of nitrobenzene/water and in that the first ion exchange is effected with a di- or trialkylamine of 12 to 40 carbon atoms in total and the second with a C2-C4-mono-, -di- or -trialkanolamine. …??The dye solutions thus obtained are suitable in particular for dyeing paper.
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