Huang Peng, Ahamed Ashiq, Sun Ruitao, De Hoe Guilhem X, Pitcher Joe, Mushing Alan, Lourenço Fernando, Shaver Michael P
Department of Materials, Henry Royce Institute, The University of Manchester, Manchester M13 9PL, U.K.
Pragmatic Semiconductor Ltd., Cambridge CB4 0WH, U.K.
ACS Sustain Chem Eng. 2023 Oct 13;11(42):15328-15337. doi: 10.1021/acssuschemeng.3c04047. eCollection 2023 Oct 23.
The recycling of multimaterials such as payment or access cards poses significant challenges. Building on previous experimental work demonstrating the feasibility of chemically recyclable payment cards made from glycol-modified poly(ethylene terephthalate) (PET-G), we use life cycle assessment and techno-economic analysis to investigate two chemical recycling scenarios and evaluate their potential environmental and economic benefits. Recovering all components from the depolymerized products (Scenario 1) achieves substantial environmental benefits across most categories, reducing global warming by up to 67% compared to only recovering major components (Scenario 2). However, the environmental benefits in Scenario 1 incur 69% higher total annualized costs, causing its profitability to be dependent on a minimum selling price of £13.4/kg for cyclohexanedimethanol and less than a 10% discount rate. In contrast, Scenario 2 is less sensitive to discount rate variation and thus a lower risk and more economically feasible option, albeit less environmentally sustainable.
诸如支付卡或门禁卡等多材料的回收带来了重大挑战。基于先前的实验工作，该工作证明了由二醇改性聚对苯二甲酸乙二酯（PET-G）制成的可化学回收支付卡的可行性，我们使用生命周期评估和技术经济分析来研究两种化学回收方案，并评估它们潜在的环境和经济效益。从解聚产物中回收所有成分（方案1）在大多数类别中都能实现显著的环境效益，与仅回收主要成分（方案2）相比，全球变暖最多可减少67%。然而，方案1中的环境效益导致年化总成本高出69%，这使得其盈利能力取决于环己二醇的最低售价为13.4英镑/千克且贴现率低于10%。相比之下，方案2对贴现率变化不太敏感，因此是风险较低且经济上更可行的选择，尽管其环境可持续性较差。
