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This is a yellow colour direct 11 in the form of solutions concentrated stable, solutions obtained and applications
This is a yellow colour direct 11 in the form of solutions concentrated stable, solutions obtained and applications
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机译:这是一种黄色的直接溶液11,其形式为浓缩浓缩液,所得溶液和应用
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摘要
The invention relates to a process for the preparation of the dyestuff Direct Yellow 11 directly in the form of stable concentrated solutions, in which caustic soda in aqueous solution is reacted, at a temperature from 40 DEG to 90 DEG C., with a solution containing 4-nitro-toluene-2-sulfonic acid, one or more alkanolamines, one or more alcohols containing an etheroxide function or a second alcohol function, then the caustic soda is neutralized by addition of sulfuric acid and the sodium sulfate thus formed is separated by filtration. The solutions obtained by the process according to the invention are particularly suitable for dyeing cellulosic materials and leather.
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