톨루엔 및 MEK가 흡착된 활성탄소섬유에 대해 초임계 이산화탄소를 이용하여 재생하였고,온도(308-333K), 압력(185-250atm), 밀도(0.690-0.902g/cm³)의 운전 조건이 재생 효율에 미치는 영향을 살펴보았다. 초임계 유체의 압력이 높을수록 높은 재생 효율을 보였지만, 일정 압력 조건에서는 318K가 최적의 재생 온도로 관찰되었다. 그러나 같은 밀도를 기준으로 하였을 때, 온도가 높을수록 탈착효율이 향상되었다. 활성탄소섬유에 있어 MEK/톨루엔 혼합물 탈착의 경우 MEK가 톨루엔보다 잘 탈착되었으나, MEK의 극성으로 인해 압력이 증가함에 따라 두 물질간의 탈착 속도와 탈착량의 차이도 감소하였다. 선형 탈착 kinetics 가정하의 단일 매개변수 모델을 사용하여 재생 효율을 예측하였고, 이는 실험결과와 비교적 잘 일치하였다. 활성탄소섬유에서의 톨루엔에 대한 탈착 활성화에너지는 활성탄에 대한 문헌치와 유사하였으며, 밀도가 클수록 작은 값을 보였다.

The activated carbon fiber loaded with toluene and MEK was regenerated by supercritical carbon dioxide. And, the effect of temperature(308-333 K), pressure(185-250 atm) and density(0.690-0.902 g/cm³) on the regeneration efficiency were studied. It was observed that the operations at higher pressure were more favorable for regeneration, but the optimal operating temperature was 318 K at every pressure condition. However, at the same density, the regeneration efficiency was increased with temperature. In case of MEK/toluene mixture, the difference in the desorption rate and amount between both materials was decreased as the pressure was increased. The regeneration efficiency was predicted by using a one-parameter mathematical model assuming linear desorption kinetics. The predicted value was found to match the experimental data well. The desorption activation energies of activated carbon fiber adsorbed by toluene were close to the literature values of an activated carbon. The activation energy showed a smaller value at higher pressure.

Activated Carbon Fiber Supercritical Carbon Dioxide MEK/Toluene One-Parameter Model

McHugh MA, Krukonis VJ, "Supercritical Fluid Extraction, Principles and Practice," Butterworths, Stoneham (1986)
Paulaitis ME, Krukonis VJ, Reid RC, Rev. Chem. Eng., 1, 179 (1983)
DeFilippi RP, Krukonis VJ, Robey RJ, Modelll M, "Supercritical Fluid Regeneration of Activated Carbon for Adsorption of Pesticides," EPA Report, Washington D.C. (1980)
Kander RG, Paulaitis ME, "Chemical Engineering and Supercritical Conditions," Stuffet, I.H. and McGuire, M.J., Eds., ann Arbor, Michigan (1983)
Recasens F, McCoy BJ, Smith JM, AIChE J., 35, 951 (1989) 
Erkey C, Akgerman A, AIChE J., 36, 1715 (1990) 
Tan CS, Liou DC, Ind. Eng. Chem. Res., 27, 988 (1988) 
Tan CS, Liou DC, AIChE J., 35, 1029 (1989) 
Tan CS, Liou DC, Ind. Eng. Chem. Res., 29, 1412 (1990) 
Ryu SK, Chem. Ind. Technol., 12(1), 6 (1994)
Angus S, Armstrong B, De Reuck KM, "International Thermodynamic Tables of the Fluid State Carbon Dioxide: IUPAC," Pergamon Press, NY (1976)
Ruthven DM, "Principles of Adsorption & Adsorption Processes," Wiley, New York (1984)
Byeon SH, Oh SM, Kim WS, Lee CH, Ind. Health, 35, 404 (1997)
Suzuki M, Carbon, 32(4), 577 (1994) 
Koo BS, Kim JC, Jeon JH, Bae HK, HWAHAK KONGHAK, 30(4), 491 (1992)
Koo BS, Seo JT, Bae HK, HWAHAK KONGHAK, 31(2), 229 (1993)