Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (02): 14-19.doi: 10.13475/j.fzxb.20181002106

• Fiber Materials • Previous Articles     Next Articles

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 E-mail:ge_mingqiao@126.com

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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

CLC Number: 

  • TS102

Fig.1

FT-IR absorption spectra of alcoholysis solution recovered before/after recrystallization and its products in reusing"

Fig.2

DSC spectra of alcoholysis solution recovered before and after recrystallization and its products in reusing"

Fig.3

Thermogravimetric curves of products in reusing of alcoholysis solution recovered before and after recrystallization"

Tab.1

EG recovery yield and BHET product yield in reusing of alcoholysis solution"

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

Fig.4

DSC curves of alcoholysis solution in recycling and reusing"

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