In this work, we have generalized different parametric forms of cubic equations of state (EoSs) to predict complete Joule-Thomson (J-T) inversion curves for methane at wide temperature and pressure ranges. EoSs of the Soave-Redlich-Kwong (SRK), Peng-Robinson (PR), Patel-Teja (PT), Esmaeilzadeh-Roshanfekr (ER) and the Hagtalab-Kamali-Mazloumi-Mahmoodi (HKMM) along with frequently used cohesion functions α(Tr) have been considered for plot of J-T inversion curves. The PR EoS along with different cohesion functions such as those of the Soave, Antonin Chapoy and the Tau-Sim-Tassone have been also tested for accurate prediction of the inversion curves. The four parametric EoSs of Adachi-Lu-Sugie (ALS), and Lawal-Lake-Silberberg (LLS) with their associated cohesion functions have been used for the prediction of J-T inversion curves. It has been observed that for the plot of inversion curves the LLS EoS is inadequate while the ER EoS agrees well with the previous measurements made in Laboratory. Besides, the J-T coefficient measurements from EoSs have been made for carbon dioxide and nitrogen gases at temperatures from 273.15 to 473.15 K and at pressures from 10 to 1000 atm, respectively. The uncertainties of experimental J-T coefficients data of carbon dioxide from values calculated using EoSs at constant pressure of 1 atm and 20 atm and with varying temperatures have been studied.
This aim of this paper is to predict fugacity coefficients from newly developed equations of state. The fugacity coefficients have been calculated for Methane and Caron di-oxide from equations of state of Soave Redlic Kwong (SRK), Peng Robinson (PR) and Twu Sim Tassone (TST) taking reduced temperatures, Tr
of interest from each of the three ranges 0<Tr
<1, 1<Tr<3 and 1<T <5.5 together with the reduced pressures, Pr
in steps of 0.2 in the range 0<P <10. The calculated results of fugacity coefficients were compared with the available fugacity coefficient data for Beattie-Bridgeman (BB) equation. The calculations suggest that the TST equation of state is most suitable in predicting the fugacity coefficient of pure substances.
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