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노난 이성질체의 증기압 예측

Prediction of Vapor Pressure of Nonane Isomers

성균관대학교 화학공학과, 수원 440-746
Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Korea
HWAHAK KONGHAK, October 2000, 38(5), 609-614(6), NONE
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Abstract

문헌을 통해 발표된 노난 이성질체의 증기압 실험치를 이용하여 환산형태의 Zia-Thodos 증기압 방정식의 상수 A, B, C, D와 지수 n을 결정함으로서 12개의 노난 이성질체의 증기압을 예측하였다._x000D_ log Pr = A + B/Tr + C/Tr2 + DTr3_x000D_ 오차분석법에 의해 위 식에 적용되는 노난 이성질체의 각 물질에 대한 가장 정확한 지수와 4개의 상수를 얻었다. 위 식을 통해 각 물질의 증기압을 얻기 위하여 정상 끓는점, 임계압력 및 임계온도만 필요하며, 그 결과 12개의 노난 이성질체의 445개의 증기압 실험치에 대해 0.23 %의 총 평균편차를 얻었다.
Experimental vapor pressure data reported in the literature for twelve nonane isomers have been rigorously analyzed and used to determine the constants A, B, C, D, and exponent of the following vapor pressure equation in the form of reduced vapor pressure and reduced temperature, proposed by Zia and Thodos:_x000D_ logPr=A+B/Tr+C/Tr2+DTr3_x000D_ According to varying exponent n all four constants have been obtained for nonane isomers by the error analysis. This has provided us with the best n and four constants for each material. In order to obtain the calculated vapor pressure by the above equation for each constants, only normal boiling point and the critical pressure and critical temperature are necessary to get an overall average deviation of 0.23% for 445 experimental vapor pressure points consisting of twelve nonane isomers available in the literature.

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