However, it is one of the most energy-consuming processes in the propylene production, resulting in large carbon dioxide (CO 2) emissions in the production processes. Distillation is commonly used to separate propylene from the mixture. High-purity propylene is then obtained by separating it from the mixture. In these reactions, propylene is obtained in a mixture containing propane and other byproducts. It can be industrially produced via various reactions such as naphtha pyrolysis, methanol to olefine (MTO), and propane dehydrogenation. Propylene is one of the most important feed stocks in the chemical industry. Furthermore, using the same scheme, model membranes were also employed in the two-stage membrane-separation process as case studies of technological forecasts. In the comparison, carbon taxes were implemented for assessing these two independent indicators as a single indicator, i.e., TAC with carbon tax. These results were compared to the distillation processes as benchmarks, and the advantages of the membrane-separation process were discussed. To evaluate the separation processes using various membrane combinations, two indicators, i.e., CO 2 emissions and total annual costs (TACs), were estimated based on the process simulation (Pro/II, version 10.1.1) results, including energy consumptions, operation expenditure, and capital expenditure. The separation processes were designed to minimize energy consumption using different membrane combinations (two recently developed membranes each). ![]() ![]() In this study, a two-stage membrane-separation process was designed, and its CO 2 emission and production costs were evaluated. However, because distillation is an energy-consuming process, a more efficient separation process should be developed to mitigate both carbon dioxide (CO 2) emissions and production costs. Propylene is industrially produced in a mixture with propane and generally separated from the mixture via distillation.
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