(Solid + liquid) equilibria in (polynuclear aromatic + tertiary amide) systems

The solubility of selected polynuclear aromatic compounds (anthracene, phenanthrene, carbazole, fluorene, dibenzothiophene, and dibenzofuran) in three N -substituted amide systems (N, N - dimethylacetamide, N - methyl-2-pyrrolidinone, N - methyl- ϵ -caprolactam) has been measured by a dynamic method...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 2000-10, Vol.32 (10), p.1335-1353
Main Authors: Lisicki, Zygmunt, Jamróz, Małgorzata E.
Format: Article
Language:English
Subjects:
Chemistry
correlation
d.s.c
Exact sciences and technology
General and physical chemistry
Liquid-solid equilibria
Phase equilibria
polynuclear aromatics
s.l.e
tertiary amides
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Summary:The solubility of selected polynuclear aromatic compounds (anthracene, phenanthrene, carbazole, fluorene, dibenzothiophene, and dibenzofuran) in three N -substituted amide systems (N, N - dimethylacetamide, N - methyl-2-pyrrolidinone, N - methyl- ϵ -caprolactam) has been measured by a dynamic method over the whole concentration range. In the case of N -methyl- ϵ -caprolactam systems the measurements were carried out from T= 280 K up to the melting temperatures of the aromatic compounds, because of a rapid increase of viscosity resulting in glass formation in the supercooled liquid phases. The incongruently melting compounds were found to exist only in the systems with carbazole. The other systems were simple eutectics. To estimate the activity coefficients, the liquidus curves were approximated with the Wilson, Redlich–Kister, NRTL, and UNIQUAC equations. For all calculated results the root-mean-square deviations of solubility temperatures vary from 0.1 K to 2.8 K, depending on the equation used.
ISSN:0021-9614
1096-3626
DOI:10.1006/jcht.2000.0685