Carbon Dioxide Fixation by Combined Method of Physical Absorption and Carbonation in NaOH-Dissolved Methanol

Abstract

The present study investigates the potential of a process as one of the carbon capture and storage/utilization (CCSU) technologies. The process involves a technology that combines the CO2 physical absorption and mineral carbonation in NaOH-dissolved methanol and includes CO2 desorption and methanol regeneration. Sodium methyl carbonate (SMC) is precipitated as CO2-fixing material in relatively highly concentrated NaOH solution and the amount of CO2 physically absorbed is estimated to be approximately 4.36 g CO2/500 mL methanol at ambient condition. The CCSU capacity of the process based on the gas phase and cake weight measurement is calculated to be 11.02 g CO2/(6 g NaOH/500 mL methanol) and 10.17 g CO2/(6 g NaOH/500 mL methanol), respectively. The amounts of CO2 desorbed and CO2 fixed by SMC as well as Na2CO3 via the evaporation of solution that remains after carbonation are estimated to be 5.64 g CO2/(6 g NaOH/500 mL methanol) and 4.53 g CO2/(6 g NaOH/500 mL methanol), respectively. Therefore, the CO2 ...