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Three ternary phase diagrams of ethyl paraben, ethanol, water and propyl paraben, ethanol, water have been determined. The liquid-liquid phase separation has been reported in these three ternary diagrams. In pure water the ethyl paraben and propyl paraben solubility is both below 1. mg/g, while in pure ethanol the solubility is more than three orders of magnitude higher. While the solution saturated with propyl paraben is homogeneous at 30.0. °C, and the solution saturated with ethyl paraben is homogenous at 40.0. °C, however, the higher temperatures induce liquid-liquid phase separation in the ethanol-water mixtures, and the ternary phase diagrams contain five different regions. The size of the liquid-liquid phase separation region increases with increasing temperature. The systematic changes of thermodynamic properties between butyl paraben, propyl paraben and ethyl paraben have been investigated.
|Number of pages||7|
|Journal||Fluid Phase Equilibria|
|Early online date||1 Jun 2014|
|Publication status||Published - 25 Aug 2014|
- ethanol-water solvent
- ethyl paraben
- liquid-liquid phase separation
- propyl paraben
- ternary phase diagram
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- 1 Finished
CMAC - EPSRC Centre for Innovative Manufacturing for Continuous Manufacturing and Crystallisation
Florence, A., Bititci, U., Halbert, G., Littlejohn, D. & Sefcik, J.
EPSRC (Engineering and Physical Sciences Research Council)
1/10/11 → 31/12/16