Carbon dioxide solubility in Triethylene Glycol and aqueous solutions

CO2 transportation has become a hot topic for research due to its implications for Carbon Capture and Storage (CCS) as well as Enhanced Oil Recovery (EOR). Triethylene Glycol (TEG) is one of the most commonly used chemicals in the gas processing industry. It is used in glycol dehydration units as well as occasionally for hydrate inhibition, hence for economic engineering design, it is essential to understand its phase behavior in the presence of CO2 and/or water. The solubility data are essential in adjusting binary interaction parameters used in predicting inhibitor distribution in multi-component systems. A number of measurements were made to determine the solubility of CO2 in TEG and 90, 60 and 40 weight percent (wt %) TEG solutions. These measurements were conducted in the range of 263.15–343.15 K and 0.3–37 MPa. The experimental measurements from this work are compared to open literature data available together with the thermodynamic model calculations. The solubility of CO2 in TEG and aqueous solutions were correlated with CPA-SRK72 model, using a single variable binary interaction parameter. The CPA-SRK72 EoS showed an absolute average deviation of 2.55% for pure TEG.

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