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Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.38, No.3, 440-442, 2000
Riedel의 증기압식에 의한 편심계수의 상관
Correlation of Acentric Factor Based on the Riedel Vapor Pressure Equation
배효광
열역학적 평형물성값과 수소물성값을 추산하는 경우 및 상태방정식에 주로 사용되는 편심계수가 Riedel의 증기압식을 사용하여 계산되는 방법을 제안하였다. Riedel 증기압식 중에 포함된 하나의 상수(D)와 임계점에서의 Riedel 정수(αc)의 경험적인 상관관계가 확립되었다. 이 계산방법에서는 각 물질의 비점과 임계값 만이 필요하다. 본 연구에서 제안된 방법으로 계산된 편심계수와 문헌값이 평균절대편차(AAD %)는 409종의 순수물질에 대하여 2.1%이었으며 이 결과는 기존의 추산방법인 Edminster 방법과 Lee-Kesler 방법보다 월등히 우수하였고 Antoine의 증기압식을 사용한 Chen 등의 방법과 거의 동일한 결과를 나타내었다.
The vapor pressure equation proposed by Riedel is used for the estimation of acentric factor, which is widely used in the correlation of thermodynamic and transport properties and in the equation of state. A correlation of the fourth parameter D in Riedel vapor pressure equation to Riedel parameter at critical temperature αc is empirically developed. the new method requires only the vapor pressure at normal boiling temperature and critical temperature and pressure of each component. The average absolute deviaton between the calculated and the observed acentric factor in literature is 2.1% for 409 compounds. This results compare with those of another methods, Edimster(3.6%), Lee-Kesler method(3.6%), and Chen et al. method(2.3%).
Keywords: Acentric Factor; Riedel Constant; Vapor Pressure Equation; Correlation
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