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As a part of a series
of studies that aim to expand the
experimental
database used to assist the design of novel technologies in the field
of subsea gas processing, 18 new vapor–liquid equilibrium data
points were measured for the system triethylene glycol (1) + water
(2) + methane (3) at 6.0 and 12.5 MPa, temperature range between 288
and 323 K, and a glycol content above 95 wt %. The new data include
both gas [glycol (y
1) and water (y
2)] and liquid [methane solubility (x
3)] phase composition, with relative experimental
uncertainties below 18%. It was observed that one of the experimental
data sets available in the literature is not in agreement with the
experimental data measured in this work. Furthermore, an important
target was to reevaluate the cubic-plus-association (CPA) equation-of-state
modeling capability, which has been previously used for triethylene
glycol–methane systems. CPA using a 4C association scheme for
TEG and one interaction parameter per binary has provided a good description
of the newly measured data, with the average absolute relative deviation
ranging between 9 and 43%. Binary interaction parameters regressed
solely from the corresponding binary data were used for all ternary
predictions with CPA.
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