An analytical expression for correlating Z values for liquids at low reduced temperatures

✍ Scribed by Chu Hsi; Benjamin C.-Y. Lu

• Publisher: American Institute of Chemical Engineers
• Year: 1974
• Tongue: English
• Weight: 229 KB
• Volume: 20
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690200330

✦ Synopsis

Recently, the three-parameter tabular correlation of Pitzer et al. (1955) for calculating compressibility factor of pure normal fluids has been extended to lower temperatures in the region where 0.5 9 (Lu et al., 1973). The compressibility factor is expressed linearly in the acentric factor as follows:

with values of Z'O) and 2") reported in tabular forms at regular intervals of T , and P,. For the purpose of facilitating machine computations and for obtaining other thermodynamic properties, an attempt has been made in this study to represent the tabulated values of Z'O) and Z(I) of the extended correlation for liquids by a set of generalized polynomials in terms of T , and P,.