Experiments, Modeling, and Simulation of CO2 Dehydration
by Ionic Liquid, Triethylene Glycol, and Their Binary
Mixtures
Posted on 2019-08-16 - 19:03
Ionic
liquids (ILs) as a new class of gas dehydration solvents,
in combination with the traditional triethylene glycol (TEG) solvent,
were first proposed for carbon dioxide (CO2) dehydration.
Among 210 preliminary ILs, the hydrophilic [BMIM]+[BF4]− was selected based on the COSMO-RS model-involved
IL screening methodology. The solubilities of CO2 in pure
TEG, pure [BMIM]+[BF4]−, binary
mixture of TEG + [BMIM]+[BF4]−, and ternary mixture of TEG + [BMIM]+[BF4]− + H2O were measured experimentally. Two
new binary interaction parameters were introduced by correlating a
series of experimental data with the UNIFAC-Lei model. The COSMO-RS
model along with the reduced density gradient method was applied to
interpret the nature of interaction between molecules. The CO2 dehydration experiment was conducted in a laboratory-scale
absorption tower. The process simulation indicates that, in comparison
with pure TEG, the use of IL purely or mixed with TEG improves both
separation performance and process energy penalty.
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Jiang, Yifan; Taheri, Mohsen; Yu, Gangqiang; Zhu, Jiqin; Lei, Zhigang (2019). Experiments, Modeling, and Simulation of CO2 Dehydration
by Ionic Liquid, Triethylene Glycol, and Their Binary
Mixtures. ACS Publications. Collection. https://doi.org/10.1021/acs.iecr.9b02540