The Joule–Thomson
effect is a key chemical thermodynamic
property that is encountered in several industrial applications for
CO
2
capture and storage (CCS). An apparatus was designed
and built for determining the Joule–Thomson effect. The accuracy
of the device was verified by comparing the experimental data with
the literature on nitrogen and carbon dioxide. New Joule–Thomson
coefficient (μ
JT
) measurements for three binary mixtures
of (CO
2
+ N
2
) with molar compositions
x
N
2
= (0.05, 0.10, 0.50) were performed
in the temperature range between 298.15 and 423.15 K and at pressures
up to 14 MPa. Three equations of state (GERG-2008 equation, AGA8-92DC,
and the Peng–Robinson) were used to calculate the μ
JT
compared with the corresponding experimental data. All of
the equations studied here except PR have shown good prediction of
μ
JT
for (CO
2
+ N
2
) mixtures.
The relative deviations with respect to experimental data for all
(CO
2
+ N
2
) mixtures from the GERG-2008 were
within the ±2.5% band, and the AGA8-DC92 EoSs were within ±3%.
The Joule–Thomson inversion curve (JTIC) has also been modeled
by the aforementioned EoSs, and a comparison was made between the
calculated JTICs and the available literature data. The GERG-2008
and AGA8-92DC EoSs show good agreement in predicting the JTIC for
pure CO
2
and N
2
. The PR equation only matches
well with the JTIC for pure N
2
, while it gives a poor prediction
for pure CO
2
. For the (CO
2
+ N
2
)
mixtures, the three equations all give similar results throughout
the full span of JTICs. The temperature and pressure of the transportation
and compression conditions in CCS are far lower than the corresponding
predicted
P
inv,max
and
T
inv,max
for (CO
2
+ N
2
) mixtures.
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