The solubility of Sulfabenzamide (an antibacterial drug) in supercritical carbon dioxide: Evaluation of a new thermodynamic model

Equilibrium solubilities of sulfabenzamide compound in supercritical carbon dioxide (ScCO2) have been explored at various pressures and temperatures. Solubilities measurements were carried using an equilibrium cell. Solubilities of sulfabenzamide reported were at four temperatures and at six pressures between (308 and 338) K and (12 and 27) MPa. The observed equilibrium solubilities were (1.53x10(-6) to 6.15x10(-6) at 308 K, 2.87x10(-6) to 8.98x10(-6) at 318 K, 6.15x10(-6) to 13.61x10(-6) at 328 K and 7.95x10(-6) to 22.35x10(-6) at 338 K). The measured saturation solubilities have been modeled with two new thermodynamic models based on solid-liquid equilibrium criteria. Moreover, Peng-Robinson's equation of state (PREoS) with Van der Walls mixing rules (VdWmr) and few other empirical solubility models have been explored. PREoS as temperature independent and Sodefian et al., models are quite good in predicting the data. From the correlation results it is clear that PREoS as temperature independent is able to correlate the data below 8.59% (corresponding AIC(c) is - 660.82). Among empirical models Sodefian et al., model is able to correlate the data below 8.24% (corresponding AIC(c) is -640.24). (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

In this study, equilibrium solubilities of sulfabenzamide compound in supercritical carbon dioxide were investigated at various pressures and temperatures. The data was modeled and analyzed, with PREoS and Sodefian et al., models showing good accuracy in predicting the solubility.