Ternary Vapor–Liquid Equilibrium Measurements and Modeling of Ethylene Glycol (1) + Water (2) + Methane (3) Systems at 6 and 12.5 MPa

Francois J. Kruger, Marie V. Danielsen, Georgios M. Kontogeorgis, Even Solbraa, Nicolas von Solms*

*Corresponding author for this work

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Novel technologies in the field of subsea gasprocessing 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 were measured for ethylene glycol (1) + water (2) + methane (3) at 6.0 and 12.5 MPa with temperatures ranging from 288to 323 K and glycol content above 90 wt %. Glycol in gas (y1),water in gas (y2), and methane solubility (x3) were 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 was used to model the data. Literature pure component and binary interaction parameters were used. It was 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 relativedeviation.
Original languageEnglish
JournalJournal of Chemical and Engineering Data
Issue number5
Pages (from-to)1789-1796
Number of pages8
Publication statusPublished - 2018


  • 2 Conference presentations

Phase equilibrium measurements of glycol + water + natural gas systems for the design of subsea dehydration units

Francois Kruger (Guest lecturer)

10 Jun 201813 Jun 2018

Activity: Talks and presentationsConference presentations

Opportunities in subsea dehydration - data and modelling for improved design and operations

Francois Kruger (Guest lecturer)

8 Jul 201812 Jul 2018

Activity: Talks and presentationsConference presentations


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