Phase equilibria in systems containing [alpha]-tocopherol and dense gas

Mojca Škerget (Author), Petra Kotnik (Author), Željko Knez (Author)

Abstract

Solubility of ▫$\alpha$▫-tocopherol in CO2 and propane was determined at temperatures 303, 313, 333 and 353 K and over a pressure range from 79 to 286 bar for CO2 and 16 to 112 bar for propane. A static-analytic method was applied. The solubility of ▫$\alpha$▫-tocopherol in dense CO2 under the conditions investigated was in the range of 0.2-17.0 mg/g CO2. The maximal solubilities of ▫$\alpha$▫-tocopherol in propane were approximately up to ten times higher than in CO2 and were in the range from 38.9 to 171.9 mg/g propane. Phase equilibrium data for Milk Thistle seed oil in supercritical CO2 were determined at temperatures 313, 333 and 353 K and pressures ranging from 100 to 300 bar. The oil was previously additionally vitaminized and contained 1.9 wt.% of ▫$\alpha$▫-tocopherol and 1.7 wt.% of free fatty acids (FFA). The solubility of oil in CO2 was in the range from 1.3 to 17.9 mg/g CO2. The distribution coefficients of ▫$\alpha$▫-tocopherol and FFA between light and heavy phase were determined on a solvent free basis. The obtained separation factors increased with temperature and pressure to approximately 160-200 bar and decreased with a further increase of pressure.

Keywords

kemijska procesna tehnika;superkritični fluidi;fazna ravnotežja;separacijski faktor;vitamin E;CO2;plini visoke gostote;chemical processing;supercritical fluids;phase equilibria;separation factors;dense gases;

Data

Language:	English
Year of publishing:	2003
Typology:	1.01 - Original Scientific Article
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
UDC:	66.061-987:536.42
COBISS:	7979286
ISSN:	0896-8446
Views:	1408
Downloads:	34
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary keywords:	kemijska procesna tehnika;superkritični fluidi;fazna ravnotežja;separacijski faktor;vitamin E;CO2;plini visoke gostote;
URN:	URN:SI:UM:
Pages:	str. 181-191
Volume:	ǂiss. ǂ3
Issue:	ǂVol. ǂ26
Chronology:	2003
ID:	8718838