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从聚合物废弃物生产循环乙烯的环境效益

Cecilia Salah¹, Robert Istrate², Anders Bjørn³

¹Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.

ACS sustainable chemistry & engineering

|September 20, 2024

概括

通过废物到甲醇到烯 (WMO) 路线的化学塑料回收,到2050年为环境带来了显著的好处. 这种循环生产路线 (CPR) 对具有竞争力的乙烯生产具有前景,尽管最初的影响需要谨慎管理.

科学领域:

环境科学环境科学
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

背景情况:

线性塑料经济面临着由增长的聚合物需求和废弃物带来的挑战.
目前的废弃物处理方法,如垃圾填埋和焚烧,存在重大环境缺陷.
化学回收为聚合物生产提供了一个潜在的循环替代方案.

研究的目的:

评估聚合物循环生产路线 (CPR) 的环境和经济性能.
为了比较CPR,利用废物到甲醇到烯 (WMO) 路径,与线性生产路径 (LPR) 相比.
评估2020年CPR的可行性,并预测其2050年的表现.

主要方法:

对CPR和LPR的环境影响进行生命周期评估 (LCA).
技术经济分析,以确定WMO路线的可行性.
将CPR与LPR进行比较,LPR采用了油蒸汽裂解和传统的废物管理.

主要成果:

到2050年,CPR可以实现大幅减少环境影响,特别是通过低碳电力组合.
与LPR相比,在2020年转向CPR可能会增加对特定领域的影响,如安化,酸化和资源使用.
通过CPR从回收废物聚合物中生产的乙烯可以在规模上与化石衍生乙烯具有成本竞争力.

结论:

废物到甲醇到烯 (WMO) 路线为聚合物提供了一个可行的循环经济模式.
在使用捕获的二氧化碳和绿色的绿色替代品上,CPR显示出经济优势.
实施高准备水平技术对于有效关闭聚合物循环至关重要.

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