Ternary phase diagrams of ethyl paraben and propyl paraben in ethanol aqueous solvents

Huaiyu Yang, Åke C. Rasmuson

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)69-75
Number of pages7
JournalFluid Phase Equilibria
Volume376
Early online date1 Jun 2014
DOIs
Publication statusPublished - 25 Aug 2014

Keywords

  • ethanol-water solvent
  • ethyl paraben
  • liquid-liquid phase separation
  • propyl paraben
  • ternary phase diagram

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