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Korean Chemical Engineering Research,
Vol.48, No.6, 763-767, 2010
Vol.48, No.6, 763-767, 2010
1-Propanol / CO2 이성분계의 고압 상거동
High-pressure Phase Behavior of 1-propanol / Carbon Dioxide Binary System
본 연구에서는 가변부피 투시셀이 장착된 고압 상평형 장치를 사용하여 초임계 용매인 이산화탄소와 1-propanol의 기액 상평형 거동을 관찰하였다. 이산화탄소와 1-propanol 이성분계에 대하여 온도 305.15 K, 313.15 K, 323.15 K, 333.15 K와 압력 2~11 MPa 범위까지의 실험 결과를 압력-조성(P-x)과 압력-온도(P-T)의 평형 곡선으로 나타내었다. 온도가 증가함에 따라서 혼합물 임계압력도 증가하였고 이산화탄소와 1-propanol계 혼합물의 P-T 곡선은 전형적인 type-II의 유형을 나타내었다. Peng-Robinson 상태방정식을 이용하여 실험 결과를 적합하여 결정한 최적 파라미터 값은 각각 k(ij)=0.116와 η(ij)=-0.065이였으며 Peng-Robinson 상태방정식에 적용하여 계산된 예측치는 실험결과와 비교적 좋은 일치를 보였다.
High-pressure phase behavior for the binary mixture of 1-propanol with supercritical CO2 has been measured by means of a high-pressure phase equilibrium apparatus equipped with a variable-volume view cell. The equilibrium loci of the pressure - composition and pressure - temperature were obtained for the binary mixture of 1-propanol + CO2 system at 305.15 K, 313.15 K, 323.15 K and 333.15 K, and from 2 MPa to 11 MPa. The critical temperature of the mixture increased with the temperature. The pressure-composition line for the binary mixture of CO2-1-propanol system showed a typical type-II phase behavior. The experimental P-x envelopes were correlated by using the Peng-Robinson equation of state in a satisfactory manner to obtain the parameters with k(ij)=0.116 and η(ij)=-0.065.
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