废弃聚酯醇解液的回收与循环利用  

Recycling and cyclic utilization of waste polyester alcoholysis solution

作　　者：李艳艳[1] 李梦娟[1,2] 鲁静[1] 葛明桥[1,2] LI Yanyan;LI Mengjuan;LU Jing;GE Mingqiao(School of Textile & Clothing, Jiangnan University, Wuxi, Jiangsu 214122, China;Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China)

机构地区：[1]江南大学纺织服装学院,江苏无锡214122 [2]生态纺织教育部重点实验室(江南大学),江苏无锡214122

出　　处：《纺织学报》2019年第2期14-19,共6页Journal of Textile Research

基　　金：国家重点研发计划资助项目(2016YFB0302901);中央高校基本科研业务费专项资金资助项目(JUSRP51723B);江苏高校品牌专业建设工程资助项目(PPZY2015B147)

摘　　要：为实现聚酯资源的可再生循环应用,采用乙二醇醇解法对废弃聚酯(PET)面料进行降解,得到产物对苯二甲酸乙二醇酯(BHET)。为了达到乙二醇(EG)的最大化利用率,在产物重结晶前后减压蒸馏回收醇解液,并用其代替EG再次用于废弃聚酯的降解。借助红外光谱、差示扫描量热法和热重分析法对醇解产物和醇解液进行测定。结果表明:重结晶前回收的醇解液可循环使用4～5次,EG回收率在57.1%～89.2%之间,BHET产率在58.9%～70.3%之间,醇解液使用的循环上限主要取决于醇解液中EG自聚程度;重结晶后回收的醇解液可循环使用1～2次,达到使用上限后,EG回收率由91.3%降至23.7%,BHET产率由71.2%降至50.2%。In order to realize the recycling of polyester resources, waste polyester (PET) fabrics were degraded with ethylene glycol to produce bis (2-hydroxyethyl) terephthalate ( BHET). In order to maximize the utilization ratio of ethylene glycol (EG) in the degradation process, the alcoholysis solution was recovered by vacuum distillation before and after BHET recrystallization, and reused in the degradation of waste polymers instead of fresh EG. The alcoholysis solution and alcoholysis products were determined by infrared spectroscopy, differential scanning calorimetry and thermogravimetric analysis. The results show that alcoholysis solution recovered before BHET recrystallization can be recycled for 4-5 times. The EG recovery rate is 57. 1%-89. 2%, the BHET yield is 58. 9%-70. 3%. The recycling upper limit of the alcoholysis solution depends on the self-polymerization degree of EG. The alcoholysis solution recovered after BHET recrystallization can be recycled for 1-2 times. After reaching the use upper limit of the alcoholysis solution, the EG recovery ratio is reduced from 91. 3% to 23. 7%, and the BHET yield is reduced from 71. 2% to 50. 2%.

关 键 词：聚酯 醇解 乙二醇 对苯二甲酸乙二醇酯 聚酯再生 

分 类 号：TS102[轻工技术与工程—纺织工程]