从聚烯废物中回收有价值的化学物质,通过轻度无催化剂的热水过程
Qiongying Xu1, Qiandi Wang2,3, Jiaqi Yang1
1State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China.
本研究介绍了一种水热处理方法,以化学回收废旧聚烯 (PP) 变成溶解的有机产品. 这种环保方法有效地回收PP和手术口罩,提供循环经济解决方案.
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:
- 废聚烯 (PP) 由于其反抗性质,构成了重大环境挑战.
- 有效的回收利用策略对于减轻塑料污染和促进循环经济至关重要.
研究的目的:
- 开发一种实用的化学回收策略,利用水热处理处理废弃的聚烯.
- 调查该过程的效率和产品,包括其用于回收现实世界PP废物的潜力.
主要方法:
- 在不同温度下 (例如160°C) 处理 PP 废物的无催化剂的热水处理 (HT).
- 频谱分析 (UV-Vis,光) 和富里埃变态离子循环子共振质谱法 (FT-ICR-MS) 用于产品的表征.
- 密度函数理论 (DFT) 计算以阐明反应机制.
- 技术经济分析 (TEA) 和环境生命周期成本计算 (E-LCC) 用于可行性评估.
主要成果:
- 在 160°C 的水热处理下,在 2 小时内实现了 64.1% 的 PP 转化为溶解的有机产品.
- 产品通过氧化裂变被确定为具有碳酸和碳基的短链同类物 (C10-C50),通过氧化裂变.
- 添加H2O2增强了氧化,产生了有价值的短链酸.
- 该过程证明了纯 PP 和手术口罩的克尺度回收.
结论:
- 水热氧化是一种有效的方法,用于从废弃聚烯中化学回收价值.
- 该技术在财务上可行且对环境有益,为塑料废物管理提供了一个有前途的方法.
- 该战略支持塑料向循环经济过渡.
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