利用废弃涤棉混纺纤维回收涤纶

Recycling polyester from waste polyester-cotton blends

对稀酸法分离废弃涤棉混纺纤维,回收涤纶的工艺过程进行了研究。采用正交试验考察了盐酸质量分数、反应时间、反应温度及固液比等因素对分离回收涤纶效果的影响。研究表明,影响因素的显著性大小依次为:反应时间、盐酸质量分数、反应温度、固液比。最优工艺为:盐酸质量分数10%,固液比40g/L,温度95℃,反应时间90min。反应后的涤纶成纤维状,棉纤维水解成细小粉末,通过过滤分离达到了回收涤纶的目的。

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 time>mass fraction>reaction temperature>ratio 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.