Although the recycling of polyethylene terephthalate (PET) bottles is well-operating in several countries, less than 10% of PET plastic waste was recycled in a closed loop globally, and the rest was discarded as leakage. A process to recover hydrogen and valuable chemicals through solar-assisted PET sorption-enhanced gasification was analyzed. PET steam gasification with CaO and solar-assisted calcium looping processes were already experimentally studied in our previous work to obtain optimized processing conditions. In this paper, the integrated process with product purification, steam power plant, and LiBr-HO absorption chiller was simulated with Aspen Plus based on previous experimental results to investigate the techno-economic performance. Material flows, energy balance, exergy destruction, and economics were analyzed. Day and night mode operations at different seasons were evaluated based on energy balance and the weather conditions of Naples, Italy. The energy and exergy efficiencies of day and night modes varied between 62%–72%. The annual production yields of hydrogen and benzene were 684 t and 6286 t, respectively. Due to the high production of benzene, its higher price (>1092 €/t) would make the project feasible with a larger than 12% internal rate of return value and competitive break-even hydrogen price (less than 4 €/kg). The results show that this integrated process could be technically and economically feasible. It has the potential to be implemented for hydrogen and benzene recovery from PET plastic waste with sustainable solar heat source and zero fossil CO emissions.

中文翻译：

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基于 AspenPlus 的太阳能辅助吸附增强气化从聚对苯二甲酸乙二醇酯废物中回收氢气和化学品的技术经济分析

尽管聚对苯二甲酸乙二醇酯 (PET) 瓶子的回收在多个国家运作良好，但全球只有不到 10% 的 PET 塑料废物在闭环中得到回收，其余的则作为泄漏而被丢弃。分析了通过太阳能辅助 PET 吸附增强气化回收氢气和有价值化学品的过程。我们之前的工作中已经对使用 CaO 的 PET 蒸汽气化和太阳能辅助钙循环工艺进行了实验研究，以获得优化的加工条件。本文在前期实验结果的基础上，利用Aspen Plus对产品净化、蒸汽动力装置和LiBr-H2O吸收式制冷机的集成过程进行了模拟，以研究其技术经济性能。分析了物质流动、能量平衡、火用破坏和经济学。根据能量平衡和意大利那不勒斯的天气条件评估了不同季节的白天和夜间模式运行。白天和夜间模式的能量和火用效率在 62%–72% 之间变化。氢气年产量684吨，苯年产量6286吨。由于苯产量高，其较高的价格（>1092欧元/吨）将使该项目具有大于12%的内部回报率和具有竞争力的盈亏平衡氢气价格（低于4欧元/公斤）的可行性。结果表明，这种集成工艺在技术和经济上都是可行的。它具有利用可持续太阳能热源和零化石二氧化碳排放从 PET 塑料废物中回收氢气和苯的潜力。