BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
Relative Permittivities of 1,1,1,2,3,3,3-Heptafluoropropane (HFC-227ea), 1,1,1,2,3,3-Hexafluoropropane (HFC-236ea), and 1,1,1,3,3-Pentafluorobutane (HFC-365mfc) in the Liquid Phase

Participants in the publication
A. P. C. Ribeiro (Author)
INSTITUTO SUPERIOR TÉCNICO
C. A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE
R. S. Pai-Panandiker (Author)
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
U. V. Mardolcar (Author)
INSTITUTO SUPERIOR TÉCNICO

Summary
Relative permittivity measurements of 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea), and 1,1,1,3,3-pentafluorobutane (HFC-365mfc) in the liquid phase are reported. Measurements were performed by using a direct capacitance method at temperatures from 223 K to 303 K and pressures up to 16 MPa for HFC-227ea and HFC-236ea and at temperatures from 263 K to 303 K up to 16 MPa for HFC-365mfc. The uncertainty of the relative permittivity measurements is estimated to be better than ±1.1·10-2. The theory developed by Vedam et al., and adapted by Diguet, and the Kirkwood modification of the Onsager were applied to obtain the apparent dipole moment of HFC-227ea, HFC-236ea, and HFC-365mfc in the liquid state, found to be 2.356 D for HFC-227ea, 2.624 D for HFC-236ea, and 4.917 D for HFC-365mfc. The effective dipole in the liquid state of HFC-236ea predicted by the Kirkwood−Frölich theory is 2.065 D. Density functional and density functional self-consistent calculations (SCIPCM) of the electronic distribution and of the dipole moment are reported for HFC-227ea.


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
Journal of Chemical & Engineering Data

Publication Identifiers

Publisher
American Chemical Society (ACS)



Document Identifiers
DOI - https://doi.org/10.1021/je700343t
URL - http://dx.doi.org/10.1021/je700343t

Keywords
dipole moment liquid state relative permittivity 1 1 1 2 3 3 3-heptafluoropropane 1 1 1 2 3 3-hexafluoropropane 1 1 1 3 3-pentafluorobutane HFC-227ea HFC-236ea HFC-365mfc DFT SCIPCM

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