Improved equation of state for ionic liquids using surface tension |
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Authors: | Sayed Mostafa Hosseini Zahra Sharafi |
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Institution: | (1) Department of Chemistry, Shiraz University, Shiraz, 71454, Iran;(2) Department of Chemistry, Islamic Azad University, Marvdasht Branch, Marvdasht, 71465, Iran |
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Abstract: | The major objective of this work was the development of a reliable model to describe volumetric properties of ionic liquids
(ILs). In this regard, we have applied the Ihm–Song–Mason equation of state (EOS) to some phosphonium- and imidazolium-based
ILs. Three temperature-dependent parameters in the equation of state have been scaled based on the surface tension and the
liquid density at room temperature. In order to improve the predictive power of the mentioned EOS for ILs, we have proposed
using a simple modification. We have taken 1,228 experimental points to show the reliability of the improved EOS. The comparison
of predicted densities with literature data over a broad range of temperature, 293–472 K, and pressures up to 200 MPa led
to encouraging results. The average absolute deviation of calculated densities from literature values was found to be 0.75%. |
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