Simulation of Methanol Synthesis in Packed Bed Reactor for Utilization of CO₂ from Acid Gas Removal Unit

Abstract

There are many oil and gas fields in Indonesia which contain high CO2 that need to be treated. The Acid Gas Removal Unit (AGRU) is installed to remove the CO2. The AGRU will release the CO2 gas from the regeneration column. It still contains a high concentration of CO2 (higher than 80%). The accumulation of CO2 emission to the atmosphere will impact the environment. To promote environment-friendly technology, the process can be improved with conversion of CO2 into methanol. It will provide a relatively closed loop of the carbon cycle and as a renewable energy alternative. This study aims to provide packed bed reactor design which can be implemented in the small-scale methanol production plant utilizing high CO2 feed gas. The reactor temperature was varied from 200°C to 250°C and pressure were operated in the range of 40 Bar up to 75 Bar. These variations were used to analyze the effects of methanol production. The simulation results showed that peak methanol production rate was achieved at the temperature around 230°C. As the conclusion, the reactor showed better performance at the higher pressure and higher temperature although the reaction is exothermic including the recycling process can reduce the cost of hydrogen.

Techno-economic analysis of methanol synthesis from syngas derived from steam reforming of crude glycerol

“…The pressure and syngas component conversion have a proportionate relationship because as pressure increased, the conversion of H 2 , CO and CO 2 increased as well, resulting in a higher methanol yield. A similar result was reported by Adji et al [66], who observed that the production profile of methanol increased with an increase in the reactor pressure. The hydrogenation of CO and CO 2 reaction continues at higher pressures, according to Kiss et al [67], which is favourable for methanol synthesis.…”

“…Samimi et al [68] found out from their experiment that even though high pressures are favourable for the synthesis of methanol, significant amounts of water are also produced as catalyst poisoning during the procedure [68]. Adji et al [66], emphasized that the operating pressure must be kept as low as feasible to reduce capital expenditures. Hence, production of methanol at any moderate pressure is recommended.…”