混合污染塑料废物的热解:评估聚合物的组成,温度和停留时间的影响
D Sorino1, P de Vizia1, M Baldelli2
1Tor Vergata University of Rome, Department of Civil Engineering and Computer Science Engineering, Rome, Italy.
Waste management (New York, N.Y.)
|April 13, 2025
概括
使用热溶解的热化学回收显示出从混合塑料废物中回收有价值材料的前景. 这项研究发现,温度显著影响产品产量,但素和金属等污染物需要进一步关注.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 欧盟的回收目标尚未实现,需要先进的废物管理解决方案.
- 热化学回收,特别是热解,为处理难以消费的后期塑料提供了潜力.
- 现有的研究往往使用理想化的塑料混合物,而不是现实世界的废物流.
研究的目的:
- 为了研究来自堆肥厂的真实混合塑料废物的热解.
- 为了确定温度和停留时间对产品产量和成分的影响.
- 分析热解产品中的成分和污染物.
主要方法:
- 在半批量反应堆中对预先分类的堆肥厂废物样本 (72.18%塑料:LDPE,PP,HDPE) 的热解.
- 在420°C,470°C和520°C的温度下测试单个塑料和混合物.
- 对产品产量,成分 (抛,油脂) 和污染物 (素,金属) 的分析.
主要成果:
- 温度是影响产品产量和成分的主要因素,比居住时间更重要.
- 热解主要由和烯组成,在更高的温度下,碳元素的峰值在C14-C19范围内.
- 在中检测到大量的素和金属,这给下游加工带来了挑战.
- 使用单个聚合物行为线性组合,可以以合理的准确度 (在10%的误差范围内) 预测混合物热解产量.
结论:
- 热解是一种可行的热化学回收方法,用于现实世界的混合塑料废物.
- 温度控制对于优化热解产品产量和成分至关重要.
- 污染物管理对于热解衍生产品的实际应用至关重要.
- 混合塑料热解的预测建模为流程优化提供了有价值的工具.
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