Simultaneous Material and Chemical Recycling of Waste PET/PE Multi-Layer Films under Hydrothermal Conditions

被引：1
|
作者：
Zheng, Qingxin [1 ]
Suga, Yoshiki [2 ]
Su, Yu [2 ]
Yamaguchi, Hiroya [2 ]
Watanabe, Masaru [1 ]
机构：
[1] Tohoku Univ, Res Ctr Supercrit Fluid Technol, Grad Sch Engn, Dept Chem Engn, 6-6-11 Aoba, Aramaki, Aoba-ku, Sendai 9808579, Japan
[2] Tohoku Univ, Grad Sch Engn, Dept Chem Engn, 6-6-11 Aoba,Aramaki,Aoba-ku, Sendai 9808579, Japan
来源：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2024年 / 63卷 / 44期
关键词：
Plastic recycling; PET/PE; Hydrothermal; Multi-layer film; Product separation; DEPOLYMERIZATION; POLY(ETHYLENE-TEREPHTHALATE); WATER; ACID;
D O I：
10.1002/anie.202410888
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Multi-layer plastic films are widely used in various fields especially for packaging, but due to complex composition, it is very difficult to recover single-material polymers or high-purity monomers from them after usage. In this study, we proposed a hydrothermal process for recycling PET/PE (PET: Polyethylene terephthalate; PE: Polyethylene) films. PET can be hydrolyzed to monomers of terephthalic acid (TPA) and ethylene glycol (EG). Using a hydrothermal system equipped with two filters, PE, TPA, and EG were collected separately, indicating the simultaneous material and chemical recycling of PET/PE films was firstly achieved. At 300 degrees C and 10 MPa for 60 min, PET conversion reached around 100 %, and TPA yield of 83.0 % was obtained with a high TPA purity of 96.1 %. In addition, the effect of the holding time on PET conversion, TPA yield, EG yield, and TPA purity was studied. This research opened up a new and sustainable pathway to recycle multi-layer plastic films in both lab and industry.
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页数：6
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