This study addresses the challenge of separating elastane from cotton-blend textiles to enable fiber-to-fiber recycling. The researchers developed a selective separation method using aminolytic degradation, which involves the use of polar aprotic solvents such as dimethyl sulfoxide (DMSO) in combination with diethylenetriamine (DETA) and 1,5-diazabicyclo[4.3.0]non-5-ene as a catalyst. The aminolysis process was optimized under mild conditions, reducing the elastane content to less than 0.08% in 2 hours at 80°C. The recovered cellulose was characterized and found to maintain its macromolecular properties and cellulose I crystal structure. The degraded elastane products were precipitated through water addition, and the cellulosic component was converted into new fibers via dry-jet wet spinning, resulting in high-quality man-made cellulose fibers (MMCFs) with excellent tensile properties. The study highlights a sustainable approach to recycling textile waste by selectively removing elastane and regenerating high-performance fibers.This study addresses the challenge of separating elastane from cotton-blend textiles to enable fiber-to-fiber recycling. The researchers developed a selective separation method using aminolytic degradation, which involves the use of polar aprotic solvents such as dimethyl sulfoxide (DMSO) in combination with diethylenetriamine (DETA) and 1,5-diazabicyclo[4.3.0]non-5-ene as a catalyst. The aminolysis process was optimized under mild conditions, reducing the elastane content to less than 0.08% in 2 hours at 80°C. The recovered cellulose was characterized and found to maintain its macromolecular properties and cellulose I crystal structure. The degraded elastane products were precipitated through water addition, and the cellulosic component was converted into new fibers via dry-jet wet spinning, resulting in high-quality man-made cellulose fibers (MMCFs) with excellent tensile properties. The study highlights a sustainable approach to recycling textile waste by selectively removing elastane and regenerating high-performance fibers.