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The conversion of CO 2  to methanol holds great promise, as it offers a pathway to reduce CO 2  level in the atmosphere and also produce valuable components. In this study, a typical methanol synthesis plant for CO 2  conversion was numerically modeled. Effect of fresh feed to plant parameters (i.e., pressure and CO 2  concentration) as well as the influence of recycle ratio on the reactor performance was investigated. Hence, all essential equipment, including compressor, mixer, heat exchanger, reactor, and liquid–vapor separator were considered in the model. Then, at the best operating conditions, thermal behavior and components distribution along the length and radius of the reactor were predicted. Finally, the effect of inert gases was investigated in the methanol production process and the results were compared with the conventional route (CR), which uses natural gas for methanol synthesis. The results revealed that in the absence of inert gases and by employing a recycle stream in the process, CO 2  hydrogenation leads to 13 ton/day production of methanol more than CR. While in the feedstock containing 20% inert gases, which is closer to the realistic case, methanol production rate is 45 ton/day lower than CR. These findings prospect a promising approach for the production of green methanol from carbon dioxide and hydrogen.

Carbon dioxide utilization in methanol synthesis plant: process modeling