Comparison of results of equation of states (EOSs) for estimation of a spiroindolinonaphthoxazine photochromic dye solubility in supercritical carbon dioxide

In this study, the solubility of a spiroindolinonaphthoxazine photochromic dye, (1,3-dihydro-3,3- dimethyl-1-isopropyl-6'-(2,3)-(dihydroindole-1-yl)spiro[2H-indole-2,3'-3H-naphtho [2,1-b][1,4]oxazine]) in supercritical carbon dioxide have been correlated with a new equation of state. All critical properties have been estimated with a group contribution method (GCM). In this work, the aim is correlating reported data with a new EOS and comparing obtained results with the results of Peng-Robinson EOS (PR-EOS) and the Soave-Redlich-Kowang EOS (SRK-EOS), together with two adjustable parameter van der Waals mixing and combining rules. The calculated results showed that new EOS is more accurate than PR-EOS and SRK-EOS.

Keywords:

Solubility , photochromic dye , Supercritical carbon dioxide , Correlation , Equation of State (EOS)