[1B11-1B14] CCU/carbon recycle (4)

[1B14] Highly-efficient CO₂ absorption by using aqueous diamine sorbent for direct air capture

○CAO FURONG¹, Soichi Kikkawa¹, Seiji Yamazoe¹ (1. Tokyo Metropolitan University)

Keywords:Direct air capture, isophorone diamine, carbamic acid

The liquid–solid phase separation phenomenon has potential for direct air capture (DAC), and we recently found that diamines bearing cyclohexyl group such as isophorone diamine (IPDA) show efficient CO₂ removal from air. In this study, we tested various diamines bearing cyclohexyl group in aqueous solution for removal of 400 ppm CO₂. IPDA maintained >90% CO₂ removal from 400ppm CO₂ for a long time with CO₂/IPDA ratio of 1. We confirmed CO₂ desorption from the white precipitate-contained aqueous solution at 363 K in N₂ flow condition and absorption and desorption cycles could be repeated.