An empirical consistency test using thermodynamic consistency lines for the VLE data of 7262 constant-temperature and 5167 constant-pressure binaries
It has already been shown that the deviation in the binary VLE data from the Gibbs–Duhem equation, D, is formulated as D = 2( B − A)Δ x 1 2 using Margules binary parameters, A and B, representing the VLE data, and an experimental error involved in the liquid phase composition, Δ x 1. In the present...
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Published in | Fluid phase equilibria Vol. 302; no. 1; pp. 202 - 212 |
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Main Author | |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Amsterdam
Elsevier B.V
15.03.2011
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | It has already been shown that the deviation in the binary VLE data from the Gibbs–Duhem equation,
D, is formulated as
D
=
2(
B
−
A)Δ
x
1
2 using Margules binary parameters,
A and
B, representing the VLE data, and an experimental error involved in the liquid phase composition, Δ
x
1. In the present investigation, an empirical consistency test is proposed for application to polar binaries using
D
=
0 holding at Δ
x
1
=
0. For that purpose, a polarity exclusion factor,
β
=
F/|
B
−
A|, is used, in which
F denotes a data deviation from
A
=
B. Using a significant number of the
A and
B values from the literature reported by different authors using different equipment, it was shown that
β converges to a straight line drawn on a log–log scale, which is called a thermodynamic consistency (TC) line formulated as
β
=
aP
b
using the system pressure,
P, of the constant-pressure data or the average vapor pressure of the constant-temperature data. The proposed empirical TC test uses the deviation from the TC line for determining the uncertainty of the data. Using the same data, it was also shown that
β is a polarity-independent variable. An application of the test to ternary LLE data is demonstrated. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0378-3812 1879-0224 |
DOI: | 10.1016/j.fluid.2010.10.027 |