ID14 Propylene Production ; Propylene ; Coal to Olefins Route ; Coal ; Subordinate Process 3 When using this LCA data set, ensure consideration of all relevant inputs such as raw materials, energy, electricity, steam, water, and auxiliary chemicals for the sub-stages involved in the production of syngas and propylene. Pay particular attention to the environmental burden allocation between the main product and by-products using the mass distribution method. The waste emissions of each process should also be included. Note that this evaluation does not cover the end-of-life treatment of products produced using propylene, as well as infrastructure and equipment maintenance. The functional unit of 4.82 tons should be used as a reference point for scaling data to larger or smaller production capacities as needed for your specific application.