(642d) Techno-Economic Analysis and Life Cycle Assessment for the Hydrogenolysis of Waste Plastics

Hydrogenolysis of waste polyolefins is a promising method for the conversion of polyolefin waste into valuable chemicals. In this work, we used techno-economic analysis (TEA) and life cycle assessment (LCA) to assess the economic viability and environmental sustainability of a conceptual process design for polyolefin hydrogenolysis. The TEA results indicate a minimum selling price of selected key products, liquid alkanes and propane, to be 1.5-3.5 times and 1.7 times that of virgin manufacturing, respectively. This work also explores the potential of blending the liquid alkane product with refinery streams to provide economic and environmental benefits. Additionally, the potential of closing the loop in the plastics economy via the conversion of propane to propylene monomer was assessed using a commercial propane dehydrogenation process, which resulted in a minimum selling price equivalent to that of virgin monomer. LCA analysis showed that the hydrogenolysis process has a lower environmental footprint compared to incumbent manufacturing. Furthermore, sensitivity analysis identified feedstock cost, hydrogen supply, and operating cost as the primary cost drivers. Overall, this work provides a comprehensive assessment of the conceptual process for polyolefin hydrogenolysis, highlighting the economic and environmental trade-offs involved. The results of this study can inform decision-making for stakeholders interested in developing sustainable waste management strategies.