Krickl, Sebastian and Jurko, Lucija and Wolos, Karolina and Touraud, Didier and Kunz, Werner (2018) Surfactant-free microemulsions with cleavable constituents. JOURNAL OF MOLECULAR LIQUIDS, 271. pp. 112-117. ISSN 0167-7322, 1873-3166
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Surfactant-free microemulsions (SFME) comprising a cleavable hydrotrope/hydrophobic component were investigated regarding potential applications for green, microemulsion-mediated extraction processes. To this purpose, dynamic light scattering (DLS) experiments were performed for ternary systems consisting of water/(2,2-dimethy1-1,3-dioxolan-4-yl)methanol (Solketal)/oleic acid and water/ethanol/triethyl citrate (TEC) in order to detect mesoscopic structured compositions. Further, kinetic measurements were performed for the add-catalyzed hydrolysis of Solketal (cleavable hydrotrope) and base-catalyzed hydrolysis of TEC (cleavable hydrophobic component) at different temperatures/different pH of the aqueous pseudo-phase. As proof of concept, a-tocopherol and vanillic acid were dissolved in the ternary mixtures as extractable surrogates in order to simulate an extraction and separation process. It was found that well-structured SFME can be obtained for both systems, which basically allows microemulsion-mediated extraction. Moderate changes of temperature and/or pH, lead to rapid hydrolysis of Solketal and TEC within a few hours. Finally, it could be shown that upon hydrolysis of Solketal/TEC, separation of the used surrogate solutes from the hydrolysed products is facilitated and quantitative separation could be achieved. (C) 2018 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MORPHOLOGIES; SEPARATION; EXTRACTION; MIXTURES; SOLVENTS; ACID; UV; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Oct 2019 08:33 |
| Last Modified: | 04 Oct 2019 08:33 |
| URI: | https://pred.uni-regensburg.de/id/eprint/13404 |
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