A New Alpha-function for the Peng-Robinson Equation of State：Application to Natural Gas

doi:10.1016/S1004-9541(13)60581-9

Abstract

Abstract: Cubic equations of state (EOSs) are simple and easy at calculation. One way of improving the accuracy of a cubic EOS is through the modification of temperature-dependent energy parameter by using alpha-function. The industrial applications of natural gas are very wide and as a result, prediction of thermodynamic properties and phase behavior of natural gas is an important part of design for such processes. In this work we develop a new α-function for the Peng-Robinson (PR) EOS with the parameters optimized especially for natural gas components. The parameters are generalized as a linear function of acentric factor. The results are compared to the predictions from original PR EOS and other α-functions in literature. It is shown that the new α-function presents a good accuracy with the average deviation of 1.42% for natural gas components.

Key words: Peng-Robinson, equation of state, natural gas, &alpha, -function

摘要： Cubic equations of state (EOSs) are simple and easy at calculation. One way of improving the accuracy of a cubic EOS is through the modification of temperature-dependent energy parameter by using alpha-function. The industrial applications of natural gas are very wide and as a result, prediction of thermodynamic properties and phase behavior of natural gas is an important part of design for such processes. In this work we develop a new α-function for the Peng-Robinson (PR) EOS with the parameters optimized especially for natural gas components. The parameters are generalized as a linear function of acentric factor. The results are compared to the predictions from original PR EOS and other α-functions in literature. It is shown that the new α-function presents a good accuracy with the average deviation of 1.42% for natural gas components.

关键词: Peng-Robinson, equation of state, natural gas, &alpha, -function

Hamid Saffari, Alireza Zahedi. A New Alpha-function for the Peng-Robinson Equation of State：Application to Natural Gas[J]. Chin.J.Chem.Eng., 2013, 21(10): 1155-1161.

Hamid Saffari, Alireza Zahedi. A New Alpha-function for the Peng-Robinson Equation of State：Application to Natural Gas[J]. Chinese Journal of Chemical Engineering, 2013, 21(10): 1155-1161.

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