延伸Lee-Kesler狀態方程式至非極性高碳n-C20H42

Extended Lee-Kesler Equation of state to non-polar higher hydrocarbons n-C20H42

曾慶峰(Tseng-Ching Feng)

指導教授 ： 黃淵祥

國立臺北科技大學/工程學院/化學工程研究所/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00293

摘要

本研究主要對象為非極性純物質從低至高碳碳氫化合物的熱力學性質表現，利用了氣液平衡系統，設計出一套具有物理意義的計算程序。首先將系統分為氣相跟液相兩部分來單獨討論，然後使用Modified Benedict-Webb-Rubin狀態方程式分別求出兩相的簡單流體係數和參考流體係數中所得到的體積( 、 )跟壓縮因子( 、 )，再以辛烷 為參考物質的Lee-Kesler一般化關聯式中的數學方程式，來得到壓縮因子等熱力學數據(逸壓係數、焓)。藉由逸壓係數計算出飽和蒸氣壓跟液體密度等熱力學性質來與文獻中的實驗數據作比較，觀測其絕對誤差值是否合乎我們預期內想要的結果。

關鍵字

飽和蒸氣壓 ； 液體密度 ； 壓縮因子 ； 一般化關聯式

並列摘要

Main targets of this research predict thermodynamics properties behavior in pure material of non-polar, high hydrocarbons we design a process of physics meaning to calculate it, and use vapor liquid equilibrium system.
First, the system is divided into two parts for further discussion: the vapor and the liquid phases. By modification of Benedict-Webb-Rubin equation of state, we find volume( 、 ) and compressibility factors( 、 ) from simple fluids constants and reference fluid constants.
Put those in Lee-Kesler generalized correlation and equation about other thermodynamic properties, like fugacity coefficient, enthalpy et.
Last, the vapor pressure and liquid density in the system can be calculated by the fugacity coefficient gained earlier. The results are compared with experimental data from literatures and measured with average absolute Deviation Percentage (AAD%) to observe whether they are meet of with expectation or not.

並列關鍵字

vapor pressure ； liquid density ； compressibility factor ； generalized correlation

參考文獻

[6] Thomas W. Leland, JR. Patsy S. Chappelear, “The Corresponding States Principle”, Industrial and Engineering Chemistry, Vol. 60, No. 7, p.p 15-43, July 1968.

[7] K. S. Pitzer, “The Volumetric and Thermodynamic Properties of Fluids. I Theoretical Basis and Virial Coefficients”, J. AM. Chem., Vol. 77, p.p 3427-3432, 1955.

[8] K. S. Pitzer, D. Z. Lippmann, R. F. Curl, Jr., Curl, Jr., Charles M. Huggins and Donald E. Petersen, “The Volumetric and Thermodynamic Properties of Fluids. II. Compressibility Factor, Vapor Pressure and Entropy of Vaporization”, J. Am. Chem. Soc., Vol. 77, p.p 3433-3440, 1955.

[9] Byung Ik Lee, Michael G. Kesler, “A Generalized Thermodynamic Correlation Based on Three-Parameter Corresponding States”, AIChE. Journal, Vol. 21, No, 3, p.p 510-527, 1967.

[10] Ulf Plocker, Helmut Knapp, and John Prausnitz, “Calculation of High-Pressure Vapor-Liquid Equrilibria from a Corresponding-States Correlation with Emphasis on Asymmetric Mixtures”, Ind. Eng. Chem. Process Des. Dev., Vol. 17, No. 3, p.p 324-332, 1978.