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회합성 상태방정식을 이용한 Propionic Acid와 n-Hexane 이성분계의 기액 상평형에 관한 연구
Vapor-Liquid Equilibria for Propionic Acid+n-Hexane Using Association Equation of State
경북대학교 화학공학과, 702-701 대구시 북구 산격동 1370 1동양대학교 시스템화학생명공학과, 750-711 영주시 풍기읍 교촌동 1 2한국에너지기술연구원, 305-343 대전시 유성구 장동 72-1
Department of Chemical Engineering, Kyungpook National University, 1370, Sangyeok-dong, Buk-gu, Daegu 702-701, Korea 1Department of Chemical Engineering, Dong Yang University, 1, Kyochon-dong, Punggi-eup, Youngju 750-711, Korea 2Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
HWAHAK KONGHAK, April 2003, 41(2), 202-206(5), NONE
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Abstract
본 연구에서는 기상에서 이량체를 형성함으로써 회합하는 성질을 나타내는 Propionic Acid와 n-Hexane 이성분계 혼합물의 308.15 K와 323.15 K에서의 기액 상평형 자료를 측정하였다. Peng-Robinson(PR) 상태방정식을 도입한 Anderko의 Association Equation of State(AEOS)를 이용하여 순수한 Propionic Acid의 온도에 따른 증기압과 액체의 밀도를 잘 추산하도록 상태방정식의 매개변수 a와 b를 새로 구하였다. 그리고 Anderko가 제안한 AEOS에서 물리적 기여항에 포함된 van der Waals 혼합규칙에서 Panagiotopoulos가 제안한 조성에 의존적인 혼합규칙으로 변형함으로써 Aspen Plus 공정모사기에 내장되어 있는 액상은 Non-Random-Two-Liquid(NRTL) 모형식을 기상은 Hayden-O'Connel식을 이용하여 추산한 것보다는 더 우수한 결과를 나타내었다.
Vapor-liquid equilibria data for propionic acid+n-hexane were measured at 308.15K and 323.15K. Interaction energy parameter, a and co-volume parameter b of Peng-Robinson(PR) equation of state incorporated in Association Equation of State(AEOS) proposed by Anderko were determined by regressing derived data of vapor pressures and liquid densities of pure propionic acid. By modifying van der Waals mixing rules in the physical contribution term of the AEOS to the composition dependent mixing rules proposed by Panagiotopoulos, we achieved a better thermophysical properties prediction than the two-model approach of Non-Random-Two-Liquid(NRTL) for a liquid phase and Hayden-O'Connel model for a vapor phase built in the Aspen Plus chemical process simulator.
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References
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