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

RichHTML

3

PDF (PC)

295

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"

[1] 王伟, 王朝生, 王华平, 等. 涤棉混纺织物的醇解及再聚合研究[J]. 合成纤维工业, 2017,40(1):1-5.
WANG Wei, WANG Chaosheng, WANG Huaping, et al. Study on alcoholysis and repolymerization of polyester-cotton blend fabric[J]. China Synthetic Fiber Industry, 2017,40(1):1-5.
[2] 吴宝宅, 武志云, 汪少朋, 等. DMF在聚酯纺织品脱色中的应用研究[J]. 染整技术, 2013(6):11-14.
WU Baozhai, WU Zhiyun, WANG Shaopeng, et al. Research on application of DMF for decolorization of polyester textiles[J]. Textile Dyeing and Finishing Journal, 2013(6):11-14.
[3] 甘胜华, 严宏明, 李现顺, 等. 废PET纺织品回收再利用技术工业化研究[J]. 聚酯工业, 2012,25(1):18-20.
GAN Shenghua, YAN Hongming, LI Xianshun, et al. Industrialization of waste PET textile recycling technology[J]. Polyester Industry, 2012,25(1):18-20.
[4] 王少博. PET聚酯的乙二醇解聚与再生共聚研究[D]. 上海:东华大学, 2016: 2-17.
WANG Shaobo. Study on the poly(ethylene terephthalate) recycling via glycolysis and copolycondensation[D]. Shanghai: Donghua University, 2016: 2-17.
[5] CAPELETTI M R, PASSAMONTI F J. Optimization of reaction parameters in the conversion of PET to produce BHET[J]. Polymer Engineering & Science, 2018,58(9):1500-1507.
doi: 10.1002/pen.v58.9
[6] SHARMA V, PARASHAR P, SRIVASTAVA P, et al. Recycling of waste PET-bottles using dimethyl sulfoxide and hydrotalcite catalyst[J]. Journal of Applied Polymer Science, 2013,129(3):1513-1519.
doi: 10.1002/app.38829
[7] 吕亚淑, 余天石, 郑佳, 等. 回收利用涤纶中试醇解废液再降解聚酯PET[J]. 功能材料, 2016,47(2):2258-2262.
LV Yashu, YU Tianshi, ZHENG Jia, et al. Recycling polyester alcohol solution waste liquid to degrade polyester PET[J]. Function Materials, 2016,47(2):2258-2262.
[8] 赵明宇, 张晨曦, 赵国樑, 等. 废旧涤棉混纺织物的循环醇解工艺研究[J]. 合成纤维工业, 2016,39(1):15-18.
ZHAO Mingyu, ZHANG Chenxi, ZHAO Guoliang, et al. Study on cyclic alcoholysis of waste polyester/cotton blend fabric[J]. China Synthetic Fiber Industry, 2016,39(1):15-18.
[9] 陈世明, 余天石, 葛明桥. 废弃聚酯醇解液中乙二醇回收工艺的研究[J]. 化工新型材料, 2015,43(2):40-42.
CHEN Shiming, YU Tianshi, GE Mingqiao. Study on the recycling process of ethylene glycol in waste polyester alcoholysis liquid[J]. New Chemical Materials, 2015,43(2):40-42.
[10] 范金龙, 龚敏, 侯肖, 等. 3A21铝合金在乙二醇水溶液中的腐蚀行为[J]. 腐蚀与防护, 2014,35(11):1116-1121.
FAN Jinlong, GONG Min, HOU Xiao, et al. Corrosion behavior of 3A21 aluminum alloy in ethylene glycol-water solution[J]. Corrosion & Protection, 2014,35(11):1116-1121.
[11] LI M, HUANG Y, YU T, et al. Chemical recycling of waste poly(ethylene terephthalate) fibers into azo disperse dyestuffs[J]. Rsc Advances, 2014,4:46476-46480.
doi: 10.1039/C4RA07608G
[12] GHAEMY M, MOSSADDEGH K. Depolymerisation of poly(ethylene terephthalate) fibre wastes using ethylene glycol[J]. Polymer Degradation & Stability, 2005,90(3):570-576.
[13] 陈世明, 余天石, 吕亚淑, 等. 回收利用聚酯醇解废液降解PET聚酯研究[J]. 化工新型材料, 2016(1):244-246.
CHEN Shiming, YU Tianshi, LÜ Yashu, et al. Study on the degradation of PET polyester by using the waste polyester alcoholysis liquid[J]. New Chemical Materials, 2016(1):244-246.
[14] 李梦娟, 胡正勇, 陈亮, 等. 不同废弃聚酯醇解产物分析与表征[J]. 化工新型材料, 2017(2):216-218.
LI Mengjuan, HU Zhengyong, CHEN Liang, et al. Analysis and characterization of alcohol products of different waste polyesters[J]. New Chemical Materials, 2017(2):216-218.
[15] CHEN L, CHEN J. Kinetics of diethylene glycol formation from bishydroxyethyl terephthalate with zinc catalyst in the preparation of poly(ethylene terephthalate)[J]. Journal of Applied Polymer Science, 2015,75(10):1229-1234.
doi: 10.1002/(ISSN)1097-4628
[1] WANG Qiuping, ZHANG Ruiping, LI Chenghong, ZHANG Gecheng. Preparation and characterization of conductive polyester nonwovens [J]. Journal of Textile Research, 2020, 41(10): 116-121.
[2] CHEN Yong, WANG Jingjing, WANG Chaosheng, GU Donghua, WU Jing, WANG Huaping. Effect of oligomers on crystalline properties of polytrimethylene terephthalate [J]. Journal of Textile Research, 2020, 41(10): 1-6.
[3] LI Liang, LIU Jingfang, HU Zedong, GENG Changjun, LIU Rangtong. Graphene oxide loading on polyester fabrics and antistatic properties [J]. Journal of Textile Research, 2020, 41(09): 102-107.
[4] PAN Lu, CHENG Tingting, XU Lan. Preparation of polycapne / polyethylene glycol nanofiber membranes with large pore sizes and its application for tissue engineering scaffoldrolacto [J]. Journal of Textile Research, 2020, 41(09): 167-173.
[5] DUO Yongchao, QIAN Xiaoming, ZHAO Baobao, QIAN Yao, ZOU Zhiwei. Preparation and properties of microfiber synthetic leather base [J]. Journal of Textile Research, 2020, 41(09): 81-87.
[6] ZHANG Lingyun, QIAN Xiaoming, ZOU Chi, ZOU Zhiwei. Preparation and properties of SiO2 aerogel / polyester-polyethylene bicomponent fiber composite thermal insulation materials [J]. Journal of Textile Research, 2020, 41(08): 22-26.
[7] ZHANG Zhuhui, ZHANG Diantang, QIAN Kun, XU Yang, LU Jian. Weaving process and off-axial tensile mechanical properties of wide-angle woven fabric [J]. Journal of Textile Research, 2020, 41(08): 27-31.
[8] CHEN Wendou, ZHANG Hui, CHEN Tianyu, WU Hailiang. Self-cleaning properties of titanium dioxide modified polyester / cotton blend fabrics [J]. Journal of Textile Research, 2020, 41(07): 122-128.
[9] LIU Guojin, HAN Pengshuai, CHAI Liqin, WU Yu, LI Hui, GAO Yafang, ZHOU Lan. Preparation and stability of self-crosslinking P(St-NMA) photonic crystals with structural colors on polyester fabrics [J]. Journal of Textile Research, 2020, 41(05): 99-104.
[10] JI Hong, ZHANG Yang, CHEN Kang, SONG Minggen, JIANG Quan, FAN Yonggui, ZHANG Yumei, WANG Huaping. Developing black high-tenacity polyester yarns based on dynamic characteristics [J]. Journal of Textile Research, 2020, 41(04): 1-8.
[11] WANG Xiaofei, WAN Ailan. Preparation of polypyrrole / silver conductive polyester fabric by ultraviolet exposure [J]. Journal of Textile Research, 2020, 41(04): 112-116.
[12] LIN Jiameng, WAN Ailan, MIAO Xuhong. Preparation and properties of polypyrrole / silver conductive polyester fabrics [J]. Journal of Textile Research, 2020, 41(03): 113-117.
[13] DING Fang, REN Xuehong. Flame-retardant finishing of polyester fabrics by grafting phosphorus-nitrogen compounds [J]. Journal of Textile Research, 2020, 41(03): 100-105.
[14] XING Dandan, WANG Ni, LIU Huyi, GAN Xuehui, SHI Meiwu. Characterization on distribution of TiO2 particles in opaque polyester and dull nylon filaments [J]. Journal of Textile Research, 2020, 41(02): 33-38.
[15] ZHEN Qi, ZHANG Heng, ZHU Feichao, SHI Jianhong, LIU Yong, ZHANG Yifeng. Fabrication and properties of polypropylene / polyester bicomponent micro-nanofiber webs via melt blowing process [J]. Journal of Textile Research, 2020, 41(02): 26-32.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
京ICP备14006648号
Copyright 2021 © Editorial office of Journal of Textile Research
Supported by Beijing Magtech Co.Ltd