화학 흡수를 이용한 KOH 수용액의 이산화탄소 포집 성능에 관한 연구 (A Study on Carbon Dioxide Capture Performance of KOH Aqueous Solution via Chemical Absorption)

서지정보

· 발행기관 : 대한환경공학회
· 수록지 정보 : 대한환경공학회지 / 34권 / 1호 / 55 ~ 62페이지
· 저자명 : 유미란, 한상준, 신지윤, 위정호

초록

수산화칼륨(KOH) 수용액을 이용한 CO2 포집에 관한 연구를 수행한 결과 K2CO3 생성 및 KHCO3가 생성되는 화학흡수반응이 순차적으로 일어났고 그 후 CO2 물리흡수가 일어남으로써 전 반응이 종료되었다. KOH가 한계 반응물인 회분식 흡수에서 K2CO3의 생성 속도는 OH- 농도에 관해 1차 반응이며 KHCO3 생성 속도는 CO32- 농도에 0차 반응으로 흡수 속도는 0.18gCO2/min으로 계산되었고 이 값은 K2CO3 수용액에서의 흡수 속도와 일치한다. 5% KOH 흡수제의 CO2 포집율의 경우 1구간에서 57%, 2구간에서 12% 이었으며 전체 19%로 측정되었다. KOH 흡수제의 CO2 포집양은 이론값보다 2~3% 정도 작았는데 그이유는 KHCO3 이외 K2CO3･KHCO3･1.5H2O가 생성되는 부 반응이 동반되기 때문으로 판단된다.

영어초록

The present paper investigates the performance of the KOH aqueous solution as an absorbent to capture carbon dioxide (CO2). The chemical absorption was carried out according to consecutive reactions that are generated in the order of K2CO3 and KHCO3. The overall absorption was completed with following the physical absorption. When the absorption was conducted with the KOH as the limiting reactants in batch a reactor, K2CO3 production rate was the 1st order reaction for OH-. However, KHCO3generation reaction was independent of the CO32- concentration and the rate was calculated to be 0.18 gCO2/min for all KOH absorbents,which is the same value of the reaction rate using K2CO3 aqueous solution as the absorbents. The overall CO2 capture ratio of the 5% KOH absorbent was estimated to be 19% and the individual value in section 1 and 2 was 57 and 12%, respectively.
The amount of CO2 absorbed in the solution was very slightly less than the theoretical value, which was ascribed to the side reaction that produces K2CO3･KHCO3･1.5H2O during the reaction and the consequent diminish in CO2 absorption in the KOH solution.

참고자료

· 없음