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Ternary phase diagrams of ethyl paraben and propyl paraben in ethanol aqueous solvents
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Transport Phenomena. Univ Strathclyde, Strathclyde Inst Pharm & Pharmaceut Sci, EPSRC Ctr Innovat Mfg Continuous Mfg & Crystallis, Glasgow, Lanark, United Kingdom .
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Transport Phenomena. Univ Limerick, Mat & Surface Sci Inst, Solid State Pharmaceut Cluster, Dept Chem & Environm Sci, Limerick, Ireland.
2014 (English)In: Fluid Phase Equilibria, ISSN 0378-3812, E-ISSN 1879-0224, Vol. 376, 69-75 p.Article in journal (Refereed) Published
Abstract [en]

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 degrees C, and the solution saturated with ethyl paraben is homogenous at 40.0 degrees 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.

Place, publisher, year, edition, pages
2014. Vol. 376, 69-75 p.
Keyword [en]
Ternary phase diagram, Liquid-liquid phase separation, Ethyl paraben, Propyl paraben, Ethanol-water solvent
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-150918DOI: 10.1016/j.fluid.2014.05.036ISI: 000340339100008Scopus ID: 2-s2.0-84902578161OAI: oai:DiVA.org:kth-150918DiVA: diva2:746389
Note

QC 20140912

Available from: 2014-09-12 Created: 2014-09-11 Last updated: 2017-12-05Bibliographically approved

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