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Phase Separation in Binary Systems: the Possibility of Gas-Gas Equilibrium at Subcritical Conditions

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Jaime Wisniak

Department of Chemistry Engineering, Ben-Gurion University of the Nagev, Beer-Sheva, Isreal 84105

J. Chem. Educ., 1997, 74 (5), p 546

DOI: 10.1021/ed074p546

Publication Date (Web): May 1, 1997

Section:

History, Education, and Documentation

Abstract

The possibility of gases exhibiting limited solubility under subcritical conditions is analyzed and discussed. It is shown that a binary gas mixture will always behave like a regular solution and that phase splitting is theoretically feasible whenever the condition (Pdelta₁₂)/(RT) > 2 is fulfilled where delta₁₂ = 2B₁₂-B₁₁-B₂₂. The value of delta₁₂ required for phase splitting to occur is extremely large so that although the phenomena is theoretically possible, it will occur rarely or at all.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Subject):

Thermodynamics

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

A New Reference State for the Calculation of Activity Coefficients: Comment on the Paper “A Molecular Theory of the Activity Coefficient and Their Reference Fugacities at the Supercritical State”
Jaime Wisniak, Hugo Segura
Industrial & Engineering Chemistry Research2008 47 (15), 5758-5760
- A New Reference State for the Calculation of Activity Coefficients: Comment on the Paper “A Molecular Theory of the Activity Coefficient and Their Reference Fugacities at the Supercritical State”
  Jaime Wisniak, Hugo Segura
  Industrial & Engineering Chemistry Research2008 47 (15), 5758-5760
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Achieving Absolute Negative Pressures in Liquids: Precipitation Phenomena in Solution
Z. P. Visak , L. P. N. Rebelo and J. Szydlowski
Journal of Chemical Education2002 79 (7), 869
- Achieving Absolute Negative Pressures in Liquids: Precipitation Phenomena in Solution
  Z. P. Visak , L. P. N. Rebelo and J. Szydlowski
  Journal of Chemical Education2002 79 (7), 869
  A relatively simple and inexpensive experiment to achieve absolute negative pressures in liquids is reported. The liquid is a 1.80% (w/w) solution of polystyrene (Mw = 25,000) in acetone. A detailed description of the experiment is followed by photographs,...
  Abstract | Hi-Res PDF | PDF w/ Links