纺织学报 ›› 2019, Vol. 40 ›› Issue (02): 14-19.doi: 10.13475/j.fzxb.20181002106

• 纤维材料 • 上一篇    下一篇

废弃聚酯醇解液的回收与循环利用

李艳艳1, 李梦娟1,2, 鲁静1, 葛明桥1,2()   

  1. 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
  • 收稿日期:2018-10-11 修回日期:2018-11-01 出版日期:2019-02-15 发布日期:2019-02-01
  • 通讯作者: 葛明桥
  • 作者简介:李艳艳(1994—),女,博士生。主要研究方向为废弃聚酯资源化再利用。
  • 基金资助:
    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)

Recycling and cyclic utilization of waste polyester alcoholysis solution

LI Yanyan1, LI Mengjuan1,2, LU Jing1, GE Mingqiao1,2()   

  1. 1. School of Textile & Clothing, Jiangnan University, Wuxi, Jiangsu 214122, China
    2. Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
  • Received:2018-10-11 Revised:2018-11-01 Online:2019-02-15 Published:2019-02-01
  • Contact: GE Mingqiao

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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%。

关键词: 聚酯, 醇解, 乙二醇, 对苯二甲酸乙二醇酯, 聚酯再生

Abstract:

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%.

Key words: polyester, alcoholysis, ethylene glycol, bis(2-hydroxyethyl), polyester regeneration

中图分类号: 

  • TS102

图1

重结晶前后回收醇解液及其再利用产物的红外谱图"

图2

重结晶前后回收醇解液及其再利用产物的DSC谱图"

图3

重结晶前后回收醇解液再利用产物的热力学分析"

表1

醇解液再利用后EG回收率和BHET产率"

循环次数 重结晶前回收醇解液 重结晶后回收醇解液
An/g RE/% Cn/g YB/% Bn/g RE/% Dn/g YB/%
1 148.6 89.2 93.0 70.3 152.1 91.3 94.2 71.2
2 142.6 85.6 89.2 67.4 117.5 70.5 83.1 62.8
3 130.3 78.2 88.4 66.8 39.5 23.7 66.4 50.2
4 116.0 69.6 80.8 61.1 不可循环 不可降解
5 95.1 57.1 77.9 58.9 不可循环 不可降解

图4

循环回收与利用过程中醇解液的DSC表征"

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