BIBLIOS

Tipo
Artigos em Revista

Tipo de Documento
Artigo Completo

Título
Prediction of the Vapor Pressure of Environmentally Acceptable Halocarbons

Participantes na publicação
P. S. Fialho (Author)
UNIVERSIDADE DOS AÇORES
C. A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE

Resumo
The vapor pressure and its dependence on temperature of halocarbons for 0.002< p R<1 have been analyzed in terms of universal behavior. Results for CFC-114, HCFC-123, HCFC-141b, HCFC-142b, HCFC-143a, HFC-23, HFC-32, HFC-134, HFC-125, HFC-134a, and HFC-152a for reduced temperatures between 0.55 and 1.0 show that the reduced vapor pressure can be expressed as a function of 1−T R by a Padé approximant. Deviations of the correlated data from the universal function do not amount to more than ±0.06 MPa, with an average deviation of 0.025 MPa. Predictions of the saturation vapor pressures of HCFC-124, HCFC-225ca, and HCFC-225cb, which are the systems used to test the capability of this scheme, agree within 0.025 MPa, that is, within the accuracy of the corresponding states correlation. However, for HFC-236ea, the deviations are as large as −0.07 MPa. The present scheme can be used to calculate the Pitzer acentric factor, and an average value of ω=0.269±0.015 is obtained for all the fluids.


Instituição
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Suporte
International Journal of Thermophysics

Identificadores da Publicação

Editora
Springer Science and Business Media LLC



Identificadores do Documento
DOI - https://doi.org/10.1023/a:1006631512597
URL - http://dx.doi.org/10.1023/a:1006631512597

Keywords
halocarbons prediction estimation vapor pressure universal correlation refrigerants

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