基于PET的酶去聚合的PET-PE多层包装材料的有效回收
Daan M van Vliet1, Jurgen J Mateman1, Rick H A M van de Vondervoort1
1Wageningen Food & Biobased Research, Wageningen University & Research, Bornse Weilanden 9, Wageningen 6708 WG, Netherlands.
概括
酶性水解有效地回收聚乙烯二甲-聚乙烯 (PET-PE) 多层废物. 这种可持续的方法可以在没有昂贵的预处理的情况下回收高质量的回收PET和PE,从而推进循环经济.
科学领域:
- 生物技术是生物技术.
- 聚合物科学 聚合物科学
- 可持续化学 可持续化学
背景情况:
- 机械回收面临的挑战是混合塑料废物,特别是多层材料.
- 可持续的循环经济需要改进的塑料回收技术,以获得高质量的产品.
研究的目的:
- 为了研究PET-PE多层包装废物的酶性水解.
- 评估使用聚水解酶在没有预处理的情况下进行脱聚合的可行性.
主要方法:
- 使用复合Pichia pastoris酵母生产聚水解酶.
- 在实验室和扩大规模 (4.5公斤) 的水平上,PET-PE多层托盘的酶去聚合.
- 隔离和重聚乙烯酸到rPET;性清洁和再加工PE到rPE薄膜.
主要成果:
- 实现了高的PET脱聚合率 (实验室规模≥94%,扩大规模≥95%) 和铁酸回收 (≥80%).
- 回收PET (rPET) 已成功重新聚合.
- 回收的PE被再加工成具有与初始低密度PE相似的特性的薄膜.
结论:
- 酶性水解是回收PET-PE多层废物的可行方法.
- 这种方法为传统回收提供了一个可持续的替代方案,为混合聚废物提供了广泛的潜力.
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