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

作者：Saffari Hamid^*; Zahedi Alireza

来源：Chinese Journal of Chemical Engineering, 2013, 21(10): 1155-1161.

DOI：10.1016/S1004-9541(13)60581-9

• Peng-Robinson
• equation of state
• natural gas
• alpha-function

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 a-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 a-functions in literature. It is shown that the new a-function presents a good accuracy with the average deviation of 1.42% for natural gas components.

• 出版日期2013-10