ID14 Propylene Production ; Propylene ; Coal to Olefins Route ; Coal ; Subordinate Process 1 When using the dataset for Lifecycle Assessment, ensure that the system boundaries are consistent with the scope of the provided data, which includes only raw material and auxiliary inputs, energy and resource consumption, and waste emissions. The environmental impact of the end-of-life phase, infrastructure construction, and maintenance of equipment are not included in this model. Users should apply the mass allocation method accurately to apportion environmental burdens between propylene and its co-products, considering all relevant consumptions from sub-stages and waste emissions as outlined in the dataset.