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Title:Influence of the aromatic ring substituents on phase equilibria of vanilins in binary system with CO2
Authors:ID Škerget, Mojca (Author)
ID Čretnik, Lucija (Author)
ID Knez, Željko (Author)
ID Škrinjar, Maja (Author)
Files:URL http://dx.doi.org/10.1016/j.fluid.2004.12.012
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
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:chemical processing, high pressure technology, CO2, phase equilibria, vanillin isomers, data, ring substituents
Year of publishing:2005
PID:20.500.12556/DKUM-27017 New window
ISSN on article:0378-3812
COBISS.SI-ID:9525014 New window
Publication date in DKUM:01.06.2012
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Record is a part of a journal

Title:Fluid phase equilibria
Shortened title:Fluid phase equilib.
COBISS.SI-ID:6362119 New window

Secondary language

Keywords:kemijska procesna tehnika, visokotlačna tehnologija, CO2, fazna ravnotežja, vanilin, izomeri, podatki


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