Recycling polyester from waste polyester-cotton blends

The separation process of waste polyester-cotton fiber blends with dilute acid was studied to recycle polyester.The effect of hydrochloric acid concentration,reaction time,reaction temperature and solid-liquid ratio on the separation and recovery of polyester was studied through orthogonal experiment.The results showed that the impact factors order were: reaction timemass fractionreaction temperatureratio of solid to liquid.The optimal conditions were: 10% of hydrochloric acid concentration,40 g/L of liquid,95 ℃ and 90 min.The polyester fibers were hydrolyzed into fibrous and cotton fiber were hydrolyzed into small powders after reaction so that the polyester was got.