This study presents a method for isolating high-quality cellulosic fibers from cotton-elastane blends, which are commonly used in textiles. The process involves aminolytic degradation of elastane to remove it from the cellulose, allowing the cellulose to be recycled into new fibers. The aminolysis was carried out using dimethyl sulfoxide (DMSO) as a solvent, combined with diethylenetriamine (DETA) as a cleaving agent and 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) as a catalyst. The reaction conditions were optimized to ensure minimal damage to the cellulose, with the nitrogen content in the recovered cellulose reduced to below 0.08% after 2 hours at 80°C. The resulting cellulose was then processed into new fibers via dry-jet wet spinning, yielding fibers with excellent tensile properties. The study also demonstrated that the aminolytic degradation process effectively separated elastane from cellulose without affecting the cellulose's macromolecular properties or its crystalline structure. The recovered elastane was precipitated from the solution and further analyzed. The results show that the process is effective in producing high-quality cellulosic fibers from cotton-elastane blends, with the potential for sustainable textile recycling. The study highlights the importance of developing environmentally friendly methods for the separation and recycling of synthetic fibers in textile waste.This study presents a method for isolating high-quality cellulosic fibers from cotton-elastane blends, which are commonly used in textiles. The process involves aminolytic degradation of elastane to remove it from the cellulose, allowing the cellulose to be recycled into new fibers. The aminolysis was carried out using dimethyl sulfoxide (DMSO) as a solvent, combined with diethylenetriamine (DETA) as a cleaving agent and 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) as a catalyst. The reaction conditions were optimized to ensure minimal damage to the cellulose, with the nitrogen content in the recovered cellulose reduced to below 0.08% after 2 hours at 80°C. The resulting cellulose was then processed into new fibers via dry-jet wet spinning, yielding fibers with excellent tensile properties. The study also demonstrated that the aminolytic degradation process effectively separated elastane from cellulose without affecting the cellulose's macromolecular properties or its crystalline structure. The recovered elastane was precipitated from the solution and further analyzed. The results show that the process is effective in producing high-quality cellulosic fibers from cotton-elastane blends, with the potential for sustainable textile recycling. The study highlights the importance of developing environmentally friendly methods for the separation and recycling of synthetic fibers in textile waste.