Solubility of carbon dioxide in 1-butyl-3-methylimidazolium nitrate ionic liquid at high pressure

Subject Areas :

Mojtaba Mirzaei ¹ , Faezeh Azimi ² , Babak Mokhtarani ³ , Ali Sharifi ⁴

1 - Assistant Prof. of Applied Chemistry, Department of New Technologies, Chemistry and Chemical Engineering Research Center of Iran, Tehran, Iran.
2 - M.Sc. Student in Chemical Engineering, Department of Petroleum Engineering, Chemistry and Chemical Engineering Research Center of Iran, Tehran, Iran.
3 - Professor of Chemical Engineering, Department of Petroleum Engineering, Chemistry and Chemical Engineering Research Center of Iran, Tehran, Iran.
4 - Associate Prof. of Organic Chemistry, Department of New Technologies, Chemistry and Chemical Engineering Research Center of Iran, Tehran, Iran.

Received: 2023-02-05 Accepted : 2023-06-25 Published : 2023-11-22

Keywords: Carbon dioxide adsorption, imidazolium-based ionic liquid, Henry’s law constant,

Abstract :

The experimental data of CO2 solubility in the ionic liquid 1-butyl-3-methylimidazolium nitrate [Bmim][NO3] were obtained in the temperature range of 25-60 oC and the pressure up to 4.6 MPa. The adsorption process was studied in a double-walled stainless steel batch reactor with the operational capability of bearing pressure up to 10 MPa, which was equipped with a mechanical stirrer, pressure and temperature sensors. By sarting the CO2 adsorption process, the pressure inside the reactor began to drop, and the equilibrium point was when there was no pressure drop within 15 minutes. The findings showed that the solubility of CO2 in [Bmim][NO3] increased with increasing pressure and decreasing temperature. By entering the equilibrium points obtained from the experiments in the Span-Wagner equation of state, the molar volume (Vm) and fugacity (fCO2) were obtained, which were finally used to obtain the Henry's law constants at zero pressure of CO2 (K°H,CO2) in the ionic liquid [Bmim][NO3].

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