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Correlation of solubilities of vanillins in dense CO2, R23, R134a and R236fa using different empirical density based models [Elektronski vir]
Knez, Željko ; Perva, Amra ; Škerget, Mojca
The experimentally determined solubilities of vanillin, ethylvanillin, o-vanillin and o-ethylvanillin in compressed CO2, R23, R134a and R236fa were correlated by four different empirical density ...based models. The solubility measurements were performed at temperatures 40°C and 60°C and over a pressure range between 1 and 25 MPa using a static-analytic method. The models, which differ in their linear expression between solubility and solvent's density, are named by their author as: Chrastil's model, Bartle's model, Kumar & Johnoston's model and Mendez Santiago & Teja's model. The results showed that by using three temperature-independent parameters these models can be applied for satisfactory solubility predictions at different pressures and temperatures not only for CO2 as solvent, but also for applied fluorinated hydrocarbons. An extensive comparison among the four models in terms of overall average absolute relative deviation (AARD%), regarding the type of model, type of solvent, chemical structure of solute., was performed.
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