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HWAHAK KONGHAK,
Vol.38, No.3, 366-372, 2000
Vol.38, No.3, 366-372, 2000
이산화탄소-피리딘과 이산화탄소-이소부티로니트릴계의 고압 상거동 측정
High Pressure Phase Behavior Measurement for Binary Carbon Dioxide-Pyridine and Carbon Dioxide-Isobutyronitrile Systems
초임계 이산화탄소를 포함한 피리딘(pyridine)과 이소부티로니트릴(isobutyronitrile)에 대한 이성분계 상평형데이터를 얻기 위해 실험을 수행하였다. 이산화탄소-피리딘의 이성분계 압력-조성관계는 온도 35.0℃, 55.0℃, 75.0℃, 95.0℃ 그리고 115.0℃에서 실험하였으며, 이때 압력은 18-169bar 범위였다. 또한 이산화탄소 이소부티로니트릴계의 상거동 실험은 온도 40.0℃, 60.0℃, 80.0℃, 100.0℃ 그리고 120.0℃와 압력 18-144bar 범위에서 나타내었다. 이산화탄소-피리딘과 이산화탄소-이소부티로니트릴계에 대해 일정 압력에서 이산화탄소의 용해도는 온도가 증가함에 따라 감소함을 알 수 있으며, 또한 혼합물 임계점 압력은 온도가 증가함에 따라 증가하였다. 또한 순수성분 이산화탄소와 피리딘 및 이소부티로니트릴에 대해 증기압을 서로 연결하는 혼합물 임계곡선을 계산하였다. 본 연구에서 실험한 자료를 Peng-Robinson 상태방정식으로 모델링하였으며, Peng-Robinson 상태방정식에서 온도에 독립적인 파라미터를 이용하여 계산한 계산치와 실험치를 비교하여 나타내었으며, 그 결과 좋은 일치를 보였다.
The high pressure binary phase equilibria data was obtained for pyridine and isobutyronitrile with supercritical carbon dioxide. Pressure-composition isotherms was obatained for the carbon dioxide-pytidine system at 35.0℃, 55.0℃, 75.0℃, 95.0℃, and 115.0℃ and pressure from 18 to 169 bar, and for the carbon dioxide-isobutyronitrile system at temperatures of 40.0℃, 60.0℃
, 80.0℃, 100.0℃ and 120.0℃ and pressure of 18 to 144 bar. The solubilities of carbon dioxide for pyridine and isobutyronitrile decreases as the temperature increased at constant pressure. The mixture-critical points increased as the temperature increases. These two systems have continuous critical mixture curves that exhibit maximum in pressure at temperature between the critical temperatures of carbon dioxide-pyridine and carbon dioxide-isobutyronitrile systems. The experimental results obtained in this study are modeled using the Peng-Robinson equation of state. A good fit of the data are obtained wit Peng-Robinson equation of state using an adjustable mixture parameter for the carbon dioxide-pyridine system and two adjustable mixture parameters for the carbon dioxide-isobutyronitrile system.
Keywords:
Carbon Dioxide-Isobutyronitrile System; Carbon Dioxide-Pyridine system; Binary System; Phase Behavior; Equation of State
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