Naslov
Surfactant-free microemulsions with cleavable constituents

Autori
Krickl, Sebastian ; Jurko, Lucija ; Wolos, Karolina ; Touraud, Didier ; Kunz, Werner ;

Izvornik
Journal of molecular liquids (0167-7322) 271 (2018); 112-117

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
MORPHOLOGIES ; SEPARATION ; EXTRACTION ; MIXTURES ; SOLVENTS ; ACID ; UV

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA