Novel technologies in the field of subsea gas processing include the development of natural gas dehydration facilities, which may operate at high pressure due to their proximity to reservoirs. For the qualification and design of these processing units, ternary vapor-liquid equilibrium data are required to validate the thermodynamic models used in the design process. For this purpose, 16 new ternary data points have been measured for ethylene glycol (1) + water (2) + methane (3) at 6.0 and 12.5 MPa, with temperatures ranging from 288 to 323 K and glycol content above 90 wt%. Glycol in gas (y1), water in gas (y2) and methane solubility (x3) have been measured with relative experimental uncertainties (ur(x) = u(x) / |x|) below 12 %, depending on the type of data. The Cubic-Plus-Association (CPA) equation of state has been used to model the data. Literature pure component and binary interaction parameters have been used. It is found that the model provides a good qualitative description of the experimental data for y1 and y2, while a significant over prediction occurs for x3. The modeling errors for CPA ranged between 5 - 40 % average absolute relative deviation.
Compounds
#
Formula
Name
1
C2H6O2
1,2-ethanediol
2
H2O
water
3
CH4
methane
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.