| 초록 |
This study proposes off-gas utilization process to produce methanol because of high global demand of methanol and its facile conversion to other valuable chemicals such as DME and olefin. Off-gases contain carbon monoxide, carbon dioxide, and hydrogen. Therefore, two different reaction mechanisms are chosen depending on the catalyst: CO hydrogenation and CO2 hydrogenation. Before methanol synthesis, water-gas-shift reaction is considered in order to increase amount of hydrogen, and SELEXOL process is additionally included to remove sulfur compounds and capture CO2. The process model is simulated using Aspen Plus® and evaluated in environmental and economic aspects. The analysis results of two cases are compared with each other. In terms of environmental effect, CO2 emission is estimated by the lifecycle assessment (LCA). Moreover, economic feasibility of the proposed system is evaluated through the techno-economic analysis (TEA) by comparing estimated unit production cost of methanol with commercial methanol price. |
