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

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• 作者：Sang-Jun Han ; Jung-Ho Wee
• 刊名：Energy & Fuels
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：31
• 期：2
• 页码：1747-1755
• 全文大小：490K
• ISSN：1520-5029

文摘

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 capture and fixation ratio of the process was calculated to be 55.46% and 45.54%, respectively. Although the overall methanol recovery ratio is calculated to be 90.1%, the loss can be further substantially reduced during the process by employing more advanced equipment and carrying out a more detailed operation. In addition, precipitated SMC separated methanol can be reused for the subsequent carbonation without any treatment.