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이산화탄소-Hexanoic Acid와 이산화탄소-Octanoic Acid 이성분계의 고압 상거동
High Pressure Phase Behavior of Carbon Dioxide-Hexanoic Acid and Carbon Dioxide-Octanoic Acid Binary Systems
HWAHAK KONGHAK, August 1999, 37(4), 568-574(7), NONE
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Abstract
고압하에서 이산화탄소-hexanoic acid와 이산화탄소-octanoic acid계의 이성분게에 대한 상거동데이터를 얻기 위해 실험을 수행하였다. 등온에서 이산화탄소-hexanoic acid와 이산화탄소-octanoic acid계의 압력-조성관계를 온도 35, 55, 75 그리고 100℃에서 실험하였으며, 이때 압력은 23-240bar범위이다. 두 계에 대해 동일한 압력에서 hexanoic acid와 octanoic acid의 용해도는 온도가 증가할수록 증가함을 알 수 있었으며, 또한 두 계에 대한 혼합물 임계압력과 조성에 대하여 나타내었다. 본 연구에서 실험한 결과를 statistical associating fluid theory(SAFT) 상태식으로 모델링하였으며 SAFT 상태식은 온도에 독립인 파라미터 두 개를 포함하고 있다. 본 모델에 대한 계산치와 실험치를 비교하여 나타내었다. 그 결과 실험치와 계산치는 좋은 일치를 보였다.
The binary carbon dioxide-hexanoic acid and carbon dioxide-octanoic acid systems were studied to obtain phase behavior data under high pressure. Pressure-composition isotherms are obtained for the carbon dioxide-hexanoic acid and carbon dioxide-octanoic acid systems at temperatures of 35,55,75 and 100℃ and for pressure range from 23 to 240 bar. The critical properties of carbon dioxide-hexanoic acid and carbon dioxide-octanoic acid systems are determined to near to critical point of pure carbon idoxide. These carbon dioxide-polar acid binary systems have continuous critical mixture curves that exhibit maximums in pressure at temperatures between the critical temperatures of carbon dioxide and hexanoic acid or octanoic acid. The experimental data obtained in this study are modeled using the statistical associating fluid theory(SAFT) equation of state. The experimental data are good correlated by using SAFT equation of state with two adjustable parameters for the carbon dioxide-hexanoic acid and carbon dioxide-octanoic acid systems.
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