Abstract:
At present, the problem of global warming is becoming a significant issue worldwide, primarily due to continuous carbon dioxide emissions. In the year B.E. 2565, Thailand released a significant amount of carbon dioxide, with the highest contribution coming from electricity generation. To prevent the worsening of global warming, it is necessary to reduce carbon dioxide emissions or transform them into valuable chemicals (Carbon Capture and Utilization:CCU ). One promising CCU method is the hydrogenation of carbon dioxide (CO2 hydrogenation), which is a relatively simple process suitable for direct gas emission capture. This research simulated the CO2 hydrogenation process using a Cu/Zn/Al/Zr catalyst under nine different conditions. The study analyzed the production efficiency of the process, its economic impact, and environmental implications. Additionally, the transformation of methanol into olefins (MTO) was studied using an SAPO-34 catalyst at operating conditions of temperature 470 degrees Celsius, pressure 2 bar, and WHSV 5 h-1 along with Comparing the results of combining and separating the CO2 hydrogenation and MTO processes to facilitate construction on-site. From the study, The optimal condition for transforming carbon dioxide into methanol through CO2 hydrogenation was found to be an operating temperature of 250 degrees Celsius, a pressure of 70 bars, a space velocity of 6,000 l/kgcath, and a molar ratio of hydrogen to carbon dioxide of 3:1. This condition resulted in high carbon dioxide conversion and methanol yield. However, the economic analysis of transforming methanol into olefins showed significant negative impacts, with a Net Present Value (NPV) of -4,137.91 million dollars. When both processes were combined into a single integrated process, the economic outcomes were more favorable than when the processes were separated. Considering the carbon credits from an economic perspective, the integrated process of carbon dioxide hydrogenation to methanol and the subsequent transformation of methanol into olefins resulted in a more economically positive outcome compared to separating the two processes.