【企画講演】 ゼロエミッション社会構築にむけたCCS/CCUS技術開発

[2307-15-08] (学生発表：博士課程)Effects of aqueous MEA, DEA, TEA, and AMP absorbents on multicycle CO₂ mineralization under standard conditions

○Chanakarn Thamsiriprideeporn¹, Tetsuya Suekane¹ (1. Tokyo Institute of Technology)

司会：江崎丈裕（九州大学）

キーワード：Absorbent degradation, Carbon capture, utilization, and storage, Carbonate precipitation, CO2 absorption capacity, CO2 mineralization cycle

CO₂ in a chemical-based absorbent with alkali solution aims to mineralize as precipitated carbonates in CO₂ mineralization that is promising for carbon capture, utilization, and storage. Monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), and aminomethyl propanol (AMP) were examined in terms of performances of CO₂ absorption and CO₂ conversion, and absorbent degradation during the operation of multicycle CO₂ mineralization involving absorption, precipitation, and regeneration processes. The experimental condition was controlled between 20°C and 25°C at atmospheric pressure, standard conditions. We found that 5 wt.% AMP was an optimum alternative option that provided 89.5% CO₂ absorption capacity per unit of absorbent converted into the amount of solid carbonate within 4 cycles. It was moderately degraded by 45% in the first cycle, and then decreased from 30% to 10% in the next cycles (>2 cycles). Furthermore, AMP offered a 5-fold increase in the speed of multicycle CO₂ mineralization compared with MEA, which was used as the initial absorbent.