Phase equilibria and extraction of the fat-soluble vitamins D2, D3, K3 and E in dense CO2 and n-propane
Solid-Liquid (S-L) phase transitions of vitamins K3, D3 and D2 under the pressure of gas were determined with the modified capillary method. For all vitamins under the pressure of CO2, n-propane and dimethylether, a negative dP/dT slope of the S-L-V curve was found. For K3 under the pressure of iner...
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| Format: | Book Chapter |
| Jezik: | English |
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| Sorodne knjige/članki: | Vsebovano v:
Proceedings of the 5th International symposium on supercritical fluids, Atlanta, Georgia, USA, April 8-12, 2000 |
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| LEADER | 02652naa a2200241 ib4500 | ||
|---|---|---|---|
| 001 | 5344790 | ||
| 003 | SI-MaCOB | ||
| 005 | 20031128000000.0 | ||
| 008 | 000522s2000 xxu|||||s|||||||| ||eng c | ||
| 040 | |a KTFMB |b slv |c SI-MaIIZ |d KTFMB |e ppiak | ||
| 080 | |a 66.02 | ||
| 245 | 1 | 0 | |a Phase equilibria and extraction of the fat-soluble vitamins D2, D3, K3 and E in dense CO2 and n-propane |h [Elektronski vir] / |c Mojca Škerget ... [et al.]. |
| 300 | |a Str. [1-8]. | ||
| 500 | |a Soavtorji: Majda Hadolin, Andreja Rižner-Hraš, Klementna Kokot, Željko Knez. | ||
| 520 | |a Solid-Liquid (S-L) phase transitions of vitamins K3, D3 and D2 under the pressure of gas were determined with the modified capillary method. For all vitamins under the pressure of CO2, n-propane and dimethylether, a negative dP/dT slope of the S-L-V curve was found. For K3 under the pressure of inert gas (argon and nitrogen), the S-L-V curve had a positive dP/dT slope. The experimental data were correlated using the Peng-Robinson equation of state. The fit of S-L-V lines showed good results in the case of vitamin K3 and the order of magnitude of the solid solubilities was well represented. Solubilities of the fat-soluble vitamins K3, D3, D2 and [alpha]-tocopherol (vitain E) in CO2 and n-propane were measured at temperatures 30, 40, 60 and 80 oC and over a pressure range of 80 to 300 bar for CO2 and 10 to 110 bar for n-propane using a static-analytic method. The solubilities of all vitamins in dense CO2 under the conditions investigated were in the range of 0.02 x 10^{-3} to 1.7 x 10^{-3} mole fraction, except for vitamin K3, where the solubility in CO2 was higher and in the range from 0.16 x 10^{-3} to 8.64 x 10^{-3} mole fraction. The solubilities of vitamins in n-propane were approximately up to 10 times higher than in CO2 and in the range from 0.5 x 10^ {-3} to 17.12 x 10^{-3} mole fraction. The only exception was vitamin K3, where the solubilities in n-propane were lower than in CO2. | ||
| 653 | 0 | |a kemijska procesna tehnika |a ekstrakcija |a superkritični fluidi |a CO2 |a n-propan |a dimetil eter |a vitamini |a topnost | |
| 653 | 0 | |a chemical engineering |a extraction |a supercritical fluids |a CO2 |a n-propane |a dimethylether |a vitamins |a solubility | |
| 700 | 1 | 2 | |a Škerget, Mojca. |4 aut |
| 700 | 1 | 2 | |a Hadolin Kolar, Majda. |4 aut |
| 700 | 1 | 2 | |a Rižner Hraš, Andreja. |4 aut |
| 700 | 1 | 2 | |a Fukne-Kokot, Klementina. |4 aut |
| 700 | 1 | 2 | |a Knez, Željko. |4 aut |
| 773 | 0 | |a International Symposium on Supercritical Fluids (5 : 2000 : Atlanta) |t Proceedings of the 5th International symposium on supercritical fluids, Atlanta, Georgia, USA, April 8-12, 2000 |d [S.l. : s.n.], 2000 |w 5342998 |g Str. [1-8] | |