Comparison of several mixing rules in equations of state for calculating solid-solubilities in supercritical fluids

Xi Yin Zheng, Ping Li, Yoshio Iwai, Yasuhiko Arai

Research output: Contribution to journalReview articlepeer-review

2 Citations (Scopus)

Abstract

The density-dependent local-composition (DDLC) model incorporated into the Soave-Redlich-Kwong equation of state (DDLC-1 and DDLC-2) and the density-independent local-composition (DILC) model combined with the simplest van der Waals equation (DILC-1, DILC-2 and DILC-3) were applied to correlate solubilities of several aromatic hydrocarbons in five supercritical fluid solvents respectively. Results were compared with those obtained by the original SRK and van der Waals equations with the conventional mixing/combining rules of two-adjustable parameters (SRK-2 and vdW-2). The DDLC-2 was found slightly superior over the vdW-2, SRK-2, DDLC-1, DILC-1 and DILC-2. However the DILC-3 with three adjustable parameters yielded, the best results. Further, the density-dependence effect was found rather significant and the correlation accuracies were almost independent of the complexity of combining cubic equations of state. In addition, it is demonstrated that no improvements can be expected without any modification to the repulsive term of EOS for calculating solid-solubilities in supercritical fluids.

Original languageEnglish
Pages (from-to)53-63
Number of pages11
JournalMemoirs of the Kyushu University, Faculty of Engineering
Volume57
Issue number2
Publication statusPublished - Jun 1 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Energy(all)
  • Atmospheric Science
  • Earth and Planetary Sciences(all)
  • Management of Technology and Innovation

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