硫酸铜催化废旧涤/棉混纺织物水解分离效果分析

以双组分涤/棉混纺织物为研究对象,对涤/棉混纺织物进行水热降解,根据纤维素和聚酯不同的水热反应特性,研究涤/棉共存的水热反应体系中棉纤维和涤纶的水热降解行为。研究发现,涤纶和棉纤维具有不同的水热行为。在水热条件下,棉纤维发生部分水解,生成纤维素粉末及可溶糖,而涤纶保持水热稳定,可实现涤/棉混纺织物的良好分离。其中,在水热温度170℃,反应时间3 h,固液比1∶20条件下,涤纶的回收率达98.84%,葡萄糖的产率为15.57%,棉纤维的残留率约为66.47%。根据双组分涤/棉混纺织物的水解特性,综合分析回收利用的潜在价值,水热分离涤/棉混纺织物后,可使其实现高附加值回收。

Hydrothermal Separation of Waste Polyester-cotton Blended Textiles Catalyzed by Copper Sulphate

Taking polyester-cotton blended fabrics as the research object,the experiment carried out a hydrothermal degradation of polyester-cotton blended fabrics.According to the different hydrothermal reaction characteristics of cellulose and polyester,the paper studies the hydrothermal behavior of cotton fiber and polyester fiber in the hydrothermal reaction system.The results indicate that polyester fiber and cotton fiber show different hydrothermal characteristics.Under the hydrothermal conditions,cotton fiber is partially hydrolyzed to form powder cellulose and soluble oligose,while polyester fiber maintains the original form because of its hydrothermal stability.Therefore,polyester-cotton blended fabrics can achieve a good separation result.The optimized conditions are as follows:the hydrothermal temperature at 170℃,reaction time for 3 h,and the solid-liquid ratio at 1:20.Under these conditions,the recovery rate of polyester fiber reached 98.84%,the yield of glucose was 15.57%,and the residue rate of cotton fiber was about 66.47%.Based on the hydrolysis characteristics of polyester-cotton blended fabrics,the paper analyzes the potential value of recycling.The polyester-cotton blended fabrics can achieve highvalue recovery after the hydrothermal separation.