Mojca Škerget (Author), Lucija Čretnik (Author), Željko Knez (Author), Maja Škrinjar (Author)

Abstract

Solid-liquid phase transitions of vanillin, ethylvanillin, o-vanillin and o-ethylvanillin in presence of compressed CO2 were determined with the modified capillary method. Furthermore, the solubilities of the above mentioned vanillins in supercritical CO2 were measured at 313.2, 333.2 and 353.2 K and in the pressure range 8-30 MPa using a static-analytic method. The experimental equilibrium solubility data have been fitted to the Peng-Robinson equation in combination with two parameter van der Waals mixing rules and binary parameters were determined from the best fit. Results showed that the phase equilibria of vanillins in dense CO2 are influenced by the position of the hydroxyl group bound to the aromatic ring. Under the pressure of CO2 the melting point depression and also the solubility of both o-vanillins was higher than those of p-vanillins. Oppositely, the alchoxy group (methoxy or ethoxy) showed no significant influence on the solubility of vanillins.

Keywords

kemijska procesna tehnika;visokotlačna tehnologija;CO2;fazna ravnotežja;vanilin;izomeri;podatki;chemical processing;high pressure technology;phase equilibria;vanillin isomers;data;ring substituents;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
UDC: 66-987:541.1
COBISS: 9525014 Link will open in a new window
ISSN: 0378-3812
Views: 1696
Downloads: 39
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Other data

Secondary language: English
Secondary keywords: kemijska procesna tehnika;visokotlačna tehnologija;CO2;fazna ravnotežja;vanilin;izomeri;podatki;
URN: URN:SI:UM:
Pages: str. 11-19
Volume: ǂVol. ǂ231
Issue: ǂiss. ǂ1
Chronology: 2005
ID: 8718287