Solubility of Propyl p-Hydroxybenzoate in Supercritical Carbon Dioxide with and without a Cosolvent

Abstract

The solid solubility of propyl p-hydroxybenzoate was measured for the first time in supercritical carbon dioxide at temperatures of (308.15, 318.15 and 328.15) K and pressures from (8.0 to 23.0) MPa. The influence of cosolventsscyclohexane, cyclohexane + acetone (molar ratio 1:1), and acetoneswas studied at a mole fraction of 0.035. The data were obtained by using a flow-type phase equilibrium apparatus, which was further tested by measuring the solubility of benzoic acid in compressed CO 2 . The measured solubilities in supercritical CO 2 without and with cosolvents were correlated using the Chrastil equation and the modified Chrastil equation, respectively.

Solubility of Polyacrylamide in Supercritical Carbon Dioxide

“…A schematic diagram of the dynamic apparatus used to measure the solubility of PAM in this work is shown in Figure 1, which has been described in our previous work. 18 The reliability of the apparatus used in this research has been validated in our previous work 19 by comparing the solubility data of benzoic acid measured using this apparatus with the published data. 20 The high-pressure equilibrium cell, both ends of which were installed with the stainless steel sintered disks to avoid physical entrainment of the undissolved PAM, was the main piece of equipment for this experiment.…”

“…A schematic diagram of the dynamic apparatus used to measure the solubility of PAM in this work is shown in Figure , which has been described in our previous work . The reliability of the apparatus used in this research has been validated in our previous work by comparing the solubility data of benzoic acid measured using this apparatus with the published data …”

Solubility of polyvinyl alcohol in supercritical carbon dioxide and subcritical 1,1,1,2-tetrafluoroethane

“…The schematic diagram of the solubility measurement apparatus was shown in Fig. 1, and the reliability of this apparatus had been tested in our previous work [44].…”

Solubility of p-Nitrobenzoic Acid in Supercritical Carbon Dioxide with and without Cosolvents

“…Recently, supercritical carbon dioxide extraction has been used a great deal in many fields. However, carbon dioxide has limitations resulting from its lack of polarity and associated capacity for specific solvent−solute interactions, which limits its use on the supercritical fluid extraction. − The addition of small amounts of organic solvents can improve its solvent power. − …”