Abstract: To solve the effect of colorants to the recycling of waste polyester textiles, use dimethyl sulfoxide (DMSO) to decolorate dope-dyed polyester textiles. Research results show that, polyester is soluble in DMSO at high temperature, while almost insoluble and can be faded by DMSO when temperature is lower than 140°C. In 10min heat textile/DMSO mixture with a mass ratio of 1:15 at 140℃ by 10min, and the decolorization rate of dope-dyed polyester textiles is up to 47.38%. The purity of used DMSO can reach 99.0% after distillation, and can be used as decolorant repeatedly. The decolorization rate of the recovered DMSO can reach more than 45%.

Key words: DMSO, dope-dyeing, polyester textiles, decoloration.