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PTx방법을 이용한 1,1,1,2,3,3,3-Heptafluoropropane(HFC-227ea) 혼합물의 기-액 상평형 측정
Vapor-Liquid Equilibrium Measurement for 1,1,1,2,3,3,3-Heptafluoropropane (HFC-227ea) Mixture with PTx Method
(주) LG화학 정보전자소재 사업본부, 서울 150-721 1서울대학교 공과대학 응용화학부/화학공정신기술연구소, 서울 151-742
I & E Material Business Div., LG Chem LTD., Seoul 150-721, Korea 1Dept. of Chem. Eng, Seoul National University, Seoul 151-742, Korea
HWAHAK KONGHAK, August 2002, 40(4), 457-460(4), NONE
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Abstract
혼합물을 냉매로 사용할 경우, 냉매의 냉동성능 평가를 위해 기-액 상평형 데이터가 필수적이다. 본 연구에서는 HFC-227ea를 포함한 두 개의 이성분계 혼합물(HFC-227ea+HCFC-124, HFC-227ea+HCFC-142b)에 대해 상온 부근에서 기-액 상평형을 측정하였다. 두 개의 혼합물 모두 각 성분들의 끓는점 온도 차이가 작다는 특징을 갖고 있다. 온도와 압력, 그리고 액상 조성을 PTx 방볍에 의해 측정하였으며 기상의 조성은 Peng-Robinson 상태방정식을 이용하여 계산하였다. 실험 결과, 두 혼합물 모두 이상적인 상거동을 보였으며 끓는점 온도 차이가 작음에도 불구하고 공비점을 형성하지 않는 것을 확인하였다. 이는 혼합물 구성 성분간의 끓는점 차이 또는 증기압의 차이만으로 공비점 형성 여부를 판단하기는 어려우며 혼합물 상거도의 비 이상성도 함께 고려해야 정확한 판단을 할 수 있다는 것을 입증하는 것이다.
Vapor-liquid equilibrium(VLE) data are essential when using mixtures as refrigerant. At isothermal conditions, near room temperature, VLE data of two binary mixtures containing 1,1,1,2,3,3,3-heptafluoropropane(HFC-227ea)+1-chloro-1,2,2,2-tetrafluoroethane(HCFC-124), HFC-227ea+1-chloro-1,1-difluoroethane(HCFC-142b) were measured in this study. Little difference in boiling point temperature between each component features both mixtures. Temperature, pressure, and liquid phase composition were measured and vapor phase composition was determined with an equation of state. Both mixtures showed nearly ideal phase behavior and were found to be non-azeotropic mixtures in spite of little difference in boiling point temperature. This result of study shows the fact that the formation of azeotrope can be predicted with not only normal boiling point temperature or vapor pressure but with non-ideality of mixture together.
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