Dissolution of organic acids in supercritical CO2 using a CO2-philic Lewis base carrier
| Autor: | Jamie Herman, Chien M. Wai, Joanna Shaofen Wang, Youichi Enokida |
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| Rok vydání: | 2005 |
| Předmět: |
Aqueous solution
Chemistry General Chemical Engineering Inorganic chemistry Extraction (chemistry) macromolecular substances Condensed Matter Physics Supercritical fluid Lactic acid chemistry.chemical_compound Lewis acids and bases Physical and Theoretical Chemistry Solubility Citric acid Benzoic acid |
| Zdroj: | The Journal of Supercritical Fluids. 36:98-105 |
| ISSN: | 0896-8446 |
| Popis: | Solubility of hydrophilic organic acids in supercritical CO 2 (SC-CO 2 ) can be significantly increased utilizing a CO 2 -soluble Lewis base tri- n -butylphosphate (TBP) as a carrier. Solubilities of the acids carried by TBP are enhanced roughly by one order of magnitude for both citric acid and benzoic acid and a factor of 6 for lactic acid compared with those for each individual acid alone in SC-CO 2 . Spectroscopic evidence suggests a possible Lewis acid–base complex formation mechanism involving hydrogen bonding between the P O group of TBP and protons of the acids. With TBP as a carrier, the extraction efficiency of citric acid and lactic acid from aqueous solutions by supercritical CO 2 can be enhanced by a factor of 7–10. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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