织品回收:使用加热高乙醇性水性工艺从聚棉混合物中有效地回收聚
Kalliopi Elli Pavlopoulou1, Kateřina Hrůzová1, May Kahoush2
1Biochemical Process Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden.
Polymers
|November 9, 2024
概括
回收聚棉织品具有挑战性,但一种新的加热高乙醇性水性 (HHeAA) 工艺在较低的温度下有效地分解聚 (PET). 这种可持续的方法可以保护棉纤维,并显示了织废物的工业潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 织品产量翻了一番,但只有1%的纤维被回收,这对全球污染和资源枯竭作出了重大贡献.
- 在织品中常见的聚棉混合物,由于其混合纤维成分,造成了回收挑战.
- 目前用于聚 (PET) 的化学回收方法通常需要恶劣的条件,如高温,长反应时间或催化剂.
研究的目的:
- 为聚棉织废物引入一种新,高效和可持续的化学回收工艺.
- 调查加热高乙醇性水性 (HHeAA) 工艺在聚棉混合物中化PET的有效性.
- 通过评估其在缩放条件下的性能及其对棉纤维完整性的影响,评估HHeAA工艺的工业应用可行性.
主要方法:
- 开发和应用加热高乙醇性水性 (HHeAA) 工艺用于聚棉水解.
- 优化反应参数,包括温度,时间和液体/固体比率.
- 评估PET水解效率和保持棉纤维特性.
- 扩大过程以评估工业可行性.
主要成果:
- 使用HHeAA工艺,在90°C的20分钟内实现了近乎完整的PET水解.
- 在较低的温度 (70-80°C) 中也观察到有效的水解,反应时间延长.
- 成功的扩大规模证明了完全的PET水解,液体/固体比率显著降低 (从40升降至7升/kg).
- 棉纤维在经过处理后保留了大部分的特性.
结论:
- HHeAA工艺为聚棉织品的化学回收提供了一种高效和可持续的方法.
- 这种创新方法克服了传统方法的局限性,因为它在较低的温度下运行,没有催化剂.
- 该过程的可扩展性和在保护棉花质量的有效性表明,在可持续的织废物管理中,工业实施的巨大潜力.
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