Experimental Study on the Solubility of Carbon Dioxide in Nitrate and Thiocyanate-Based Ionic Liquids

Abstract

New experimental results are reported for the solubility of carbon dioxide (CO 2 ) in nitrate-and thiocyanatebased ionic liquids (ILs) at temperatures ranging from 298.15 to 333.15 K and pressure up to 4.5 MPa. The studied ILs are 1-, and 1-butyl 3-methylimidazolium tetrafluoroborate [Bmim][BF 4 ]. The solubility measurements are performed in a known volume stainless steel equilibrium cell. The experimental data indicated the solubility of CO 2 decreases with increasing of temperature. Henry's constant are calculated from the solubility data. The experimental results for CO 2 solubility are correlated with the extended Henry's law and Pitzer virial expansion using binary parameters. The correlation results of gas solubility are agreed with the experimental data.

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