Accurate PpT Data for Methane from (300 to 450) K up to 180 MPa
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Date
2010-01-10Author
Cristancho, Diego E.Matilla, Ivan D.
Ejaz, Saquib
Hall, Kenneth R.
Atilhan, Mert
Iglesia-Silva, Gustavo A.
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This paper reports PFT data measured with a high-pressure, single-sinker, magnetic-suspension densimeter (MSD)
from (300 to 450) K up to 180 MPa. Our MSD technique yields accurate data, with less than 0.05 % relative
uncertainty, over the pressure range of (10 to 200) MPa. The experimental data compare well to the Setzmann
and Wagner equation of state as implemented in RefProp 8.0. These methane density data are consistent with the
low range of pressure predicted by RefProp 8.0 that has a relative uncertainty of 0.03 % up to 12 MPa and 0.07
% up to 50 MPa. The density predictions of this model agree well with previous data at higher pressures. The
equation predicts data with almost the same uncertainty as the experimental data up to 180 MPa. These PFT data
also allow reliable determination of both second and third virial coefficients.
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