No.2-19 アミン/エーテル混合吸収剤を用いたCO₂分離回収プロセスの省エネルギー化

抄録

It has been recognized that the CO₂ separation and recovery process accounts around 60% of the total cost for operating CO₂ capture and storage (CCS). The CO₂ chemical absorption with a conventional amine solvent like monoethanol amine requires around 4 GJ/t-CO₂ for CO₂ recovery. Recently we developed phase separation solvent system which consists of not only amine but also hydrophobic solvent, ether. This system, before CO₂ absorption, we have single phase, while after CO₂ absorption, we have phase separation, one is CO₂ rich phase and the other is CO₂ lean phase. We can expect that the energy can significantly be reduced because it is not necessary to regenerate whole solvent but only the CO₂ rich phase is to be regenerated. In this study, we examined the phase phenomena for 9 types of amine and a hydrophobic solvent mixture before and after CO₂ absorption to find phase separation solvent system to minimize energy for CO₂ recovery. Based on the observation, the mechanism for the phase separation and solvent regeneration is also discussed.