| Title: | Phase equilibria in systems containing [alpha]-tocopherol and dense gas |
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| Authors: | ID Škerget, Mojca (Author)
ID Kotnik, Petra (Author)
ID Knez, Željko (Author) |
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| Files: |  http://dx.doi.org/10.1016/S0896-8446(02)00166-3
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FKKT - Faculty of Chemistry and Chemical Engineering
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| 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. |
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| Keywords: | chemical processing, supercritical fluids, phase equilibria, separation factors, vitamin E, CO2, dense gases |
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| Year of publishing: | 2003 |
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| PID: | 20.500.12556/DKUM-27672  |
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| UDC: | 66.061-987:536.42 |
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| ISSN on article: | 0896-8446 |
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| COBISS.SI-ID: | 7979286 |
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| NUK URN: | URN:SI:UM:DK:ITJ0VBAA |
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| Publication date in DKUM: | 01.06.2012 |
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| Views: | 2206 |
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| Downloads: | 48 |
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| Metadata: |    |
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| Categories: | Misc.
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