Miscibility holes and continuous liquid-liquid miscibility curves in type III and IV systems

Thomas Kraska, A. Imre, Sylwester J. Rzoska

Research output: Contribution to journalArticle

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Abstract

Liquid-liquid miscibility in binary and ternary fluids has been studied to a great extent by Professor Schneider. One of the important results of his studies was the description of the so-called immiscibility holes or islands in type IV systems. In these holes, the liquid-liquid coexistence curve virtually disappears; i.e., it goes below the vapor pressure of the mixture where the liquid becomes metastable to the liquid-vapor phase transition. In the case of the ternary system, the critical end-points then form a closed loop which is the so-called immiscibility hole. Changing, for example, the composition in ternary systems or the molar mass in binary systems containing chain molecules, one can show that a type III-like liquid-liquid critical curve can emerge from this hole. Here we show that this type III-like critical curve already exists within the hole. As a consequence, the liquid-liquid critical curves of type III and IV systems are similar if metastable states are included. The possibility of indirect estimation of the critical point loci hidden in the negative pressure domain using pressure evolution of the conductivity is shown. It is supported by the distortion sensitive and derivative based analysis of data, yielding optimal values for the parameters.

Original languageEnglish
Pages (from-to)1569-1574
Number of pages6
JournalJournal of Chemical and Engineering Data
Volume54
Issue number5
DOIs
Publication statusPublished - May 14 2009

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Solubility
Liquids
Ternary systems
Molar mass
Vapor pressure
Phase transitions
Vapors
Derivatives
Molecules
Fluids
Chemical analysis

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Miscibility holes and continuous liquid-liquid miscibility curves in type III and IV systems. / Kraska, Thomas; Imre, A.; Rzoska, Sylwester J.

In: Journal of Chemical and Engineering Data, Vol. 54, No. 5, 14.05.2009, p. 1569-1574.

Research output: Contribution to journalArticle

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