Liquid-liquid equilibria, solubility and critical states in the system propionic acid – n-butanol – n-butyl propionate – water at 293.15 K and atmospheric pressure

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2 Scopus citations

Abstract

The focus of this work is physico-chemical study of model mixtures containing butanol – a component of perspective biofuel. New detailed data on liquid-liquid equilibria (LLE), solubility and critical compositions were obtained at 293.15 K and atmospheric pressure for quaternary propionic acid – n-butanol – n-butyl propionate – water system. Research methods: gas chromatography, “cloud-point technique”. A brief review of the available data on the mutual solubility and LLE in this system is presented. The regularities of phase diagrams evolution with temperature changes are discussed. The compositions of critical phases were determined at 293.15 and 303.15 K. These data gave opportunity for the construction of polythermal critical surface in a 3D composition space. Correlation of LLE results with the use of NRTL indicates sufficient agreement with the calculated data.

Original languageEnglish
Article number105957
JournalJournal of Chemical Thermodynamics
Volume141
Early online date17 Sep 2019
DOIs
StatePublished - Feb 2020

Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Physical and Theoretical Chemistry

Keywords

  • Critical phenomena
  • Liquid-liquid equilibria
  • n-butanol
  • n-butyl propionate
  • NRTL
  • Quaternary system
  • Solubility

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