Micronisation of vanillins by ▫$PGSS^TM$▫ using various compressed gases
Knez, Željko ; Čretnik, Lucija ; Škerget, Mojca
In the paper, phase equilibria of vanillin and ethyl-o-vanillin in the presence of compressed CO2, isobutane (R-600a) and fluorinated hydrocarbons (R23, R134a, R236fa) were determined. The ...three-phase S-L-V lines were determined using the modified capillary method and the solubilities of substances in dense gases were measured by the static analytic method. Further, the micronisation of both substances using the above gases were performed the PGSS method. In all experiments the pre-expansion pressure was 120 bar and the pre-expansion temperature was 8 °C above the S-L transition of substance in dense gas at this pressure. The results showed that the phase equilibria of vanillins in gases investigated are influenced by the position of the -OH group bound to the aromatic ring of solute and molecular structure of gas, i.e. the number of fluoro atoms. For vanillin the highest melting point depression was observed in the presence of CO2, while for ethyl-o-vanillin the melting point depression was the highest in the presence of fluorinated hydrocarbons (R134a and R236fa). The solubility of both vanillins in freons researched increases with the numebr of fluoro atoms of gas.
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