Synthesis, Characterization and Applications of the New Reactive Dyes with Acetoxyethyl Sulfone Reactive Group

Abstract

The dye industry has paid great attention to reduce the concentration of salt and unfixed dye in waste water because of serious environmental pollution. Well-known C.I. black 5, C.I. red 195 and C.I. blue 194 reactive dyes contain aminophenyl b-sulfatoethyl sulfone group. These dyes have high water solubility since they have several sulfate groups but spray-dry method is adapted or large amount of salts is used for producing these dyes. To decrease sulfate functional groups of three dyes, the new reactive dyes introducing aminophenyl-b-acetoxyethylsulfone group were synthesized instead of aminophenyl b-sulfatoethyl sulfone group of these reactive dyes. In view of reactive dyes, the former can perform the same role as the latter and the new dyes show less water solubility than conventional dyes. Thus, salting-out processes were easily and cleanly carried out and provided higher yields, higher purity and good dyeing properties.