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Received March 19, 2026
Revised May 4, 2026
Accepted May 7, 2026
Available online May 26, 2026
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Diethylene Glycol Monobutyl Ether (DEGMBE)를 포함한 2-(Ethylamino)ethanol (EAE) 저수계 흡수제의 CO2 포집 특성
CO2 Capture Characteristics of Water-lean 2-(Ethylamino)ethanol (EAE) Absorbents Containing Diethylene Glycol Monobutyl Ether (DEGMBE)
https://doi.org/10.9713/kcer.2026.64.3.105166
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Abstract
본 연구에서는 2-(ethylamino)ethanol(EAE), diethylene glycol monobutyl ether(DEGMBE) 및 물로 구성된 저수계 흡수제를 이용하여 소형 충전 흡수탑에서 CO2를 포집하였다. EAE(2–5M)와 DEGMBE(0–40 wt%) 조성이 흡수제의 점도, CO2 로딩, 흡수 속도 및 총괄 물질전달계수에 미치는 영향을 고찰하였다. CO2 흡수 후 용매의 점도는 DEGMBE 함량이 증가함에 따라 증가하는 경향을 보였으나, 충전 흡수탑에서 조업 가능한 범위 내에서 유지되는 것으로 나타났다. CO2 rich 로딩은 EAE 농도가 증가할수록 반응 가능한 아민기의 증가로 인해 CO2 rich 로딩은 증가한 반면 DEGMBE 함량이 증가함에 따라 용매의 극성이 감소하여 rich 로딩은 감소하였다. 순환 로딩은 EAE 농도가 증가함에 따라 증가하였으며, DEGMBE 함량 증가에 따른 감소 폭은 비교적 제한적으로 나타났다. 또한 CO2 흡수 속도와 총괄 물질전달 계수는 흡수제로 유입되는 CO2 lean 로딩이 증가함에 따라 감소하였는데, 이는 자유 아민 농도의 감소와 액상 물질전달 저항 증가에 기인하는 것으로 해석된다. EAE/DEGMBE 기반 저수계 흡수제는 안정적인 흡수 성능을 유지하면서 CO2 포집 공정에서 재생 에너지 저감 가능성을 갖는 흡수제로 활용될 수 있을 것으로 판단된다.
In this study, the CO2 capture characteristics of water-lean absorbents composed of 2-(ethylamino)ethanol (EAE), diethylene glycol monobutyl ether (DEGMBE), and water were investigated using a laboratory-scale packed absorption column at 40°C. The effects of EAE (2–5 M) and DEGMBE (0–40 wt%) concentration on solvent viscosity, CO2 loading, absorption rate, and overall mass transfer coefficient were systematically examined. The viscosity of the solvent increased after CO2 absorption and with increasing DEGMBE content; however, the viscosity remained within the operable range for packed column operation. The rich CO2 loading increased with increasing EAE concentration due to the higher availability of reactive amine groups, whereas it decreased with increasing DEGMBE content as a result of reduced solvent polarity. The cyclic CO2 loading increased with EAE concentration, while the decrease with increasing DEGMBE content was relatively moderate. The CO2 absorption rate and overall mass transfer coefficient decreased with increasing lean CO2 loading because of the reduction in free amine concentration and the increase in liquid-phase mass transfer resistance. Overall, the EAE/DEGMBE water-lean solvent system showed stable absorption performance and potential for reducing regeneration energy in CO2 capture processes.
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