An improved density-based model for the solubility of some compounds in supercritical carbon dioxide

The ability to correlate the solubility of solutes in supercritical fluids (SCF) is of great importance for the design and evaluation of any supercritical process. The empirical equations are quite successful in correlating the solubility of compounds in the SCF. In this work, a new density-based semi-empirical model was proposed to correlate some compounds in supercritical carbon dioxide. Solubility data from 54 different compounds were collected from literature published in the last ten years and the different empirical models (Chrastil, Adachi-Lu, del Valle-Aguilera, Kumar-Johnston, Méndez Santiago-Teja, Gordillo, Jouyban, Sparks, Garlapati-Madras, and Ch-Madras) were evaluated. The results showed that, the proposed model produced the least global average absolute relative deviation (5.91%) compared to all other empirical models considered in this study.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We think that, the greatest research highlight in this paper is that an improved density-based model was proposed for correlating the solubility of solute in supercritical carbon dioxide. ► A comparison between the 11 most common empirical models and the presented model showed that the proposed model in correlation of solubility was the best.