This paper presents P-ρ-T data for pure carbon dioxide measured with a high-pressure single-sinker magnetic suspension densimeter (MSD). The data cover four isotherms (310, 350, 400, 450) K. The MSD technique yields data with less than 0.03 % relative uncertainty over the pressure range of (10 to 200) MPa. A comparison of the experimental data to the equation of state developed by Span and Wagner indicates that the equation and the data are consistent within the low range of pressure. The reference equation has a relative uncertainty of ± 0.03 % to ± 0.05 % below 30 MPa. At higher pressures, the density predictions of this model agree with the experimental data with a maximum relative deviation of 0.1 %.
This paper reports PρT data measured with a high-pressure, single-sinker, magnetic-suspension densimeter (MSD) from (298 to 450) K up to 200 MPa. The MSD technique yields accurate data, with less than 0.05 % relative uncertainty, over the pressure range of (10 to 200) MPa. The Bücker and Wagner equation of state as implemented in RefProp 8.0 compares well to the experimental data. RefProp 8.0 has a relative uncertainty of (0.02 to 0.03) % up to 30 MPa. The equation predicts data with almost the same uncertainty as the experimental data up to 200 MPa. These PρT data also allow reliable determination of both second and third virial coefficients.
This work investigates carbon dioxide solubility performances for four type V natural deep eutectic solvents (NADES). The studied solvents have hydrophobic nature, and they were prepared by using carvone (CAR), cineole (CIN), thymol (THY), and menthol (MEN). Solubilities of carbon dioxide (CO2) have been determined via new apparatus that uses the isochoric saturation method. The apparatus has been validated against a widely studied calibration fluid, which was selected as choline chloride (ChCl) and urea system, a.k.a. reline. The studied solvent NADES have been tested at 25°C and 35°C isotherms and pressures up to 40 bar. Material characterization, including Fourier transfer infrared (FTIR) and thermal gravimetric analysis (TGA), have been obtained and presented. The experimental heat of absorption of CO2 presented as a function pressure, and the CO2 sorption kinetics presented based on the fractional amount of absorbed CO2 versus time. The results demonstrated that the solubility of CO2 in monoterpenoid-based hydrophobic NADES increased with increasing pressure and decreasing temperature. In addition to their hydrophobic nature, high CO2 sorption performance with rapid CO2 solubility rate make NADES good candidates for future carbon management applications.
The folding of graphene nanostructures driven by ionic liquid nanodroplets is studied by molecular dynamics simulations. Nanodroplets formed by nine different ionic liquids comprising alkylimidazolium, cholinium, and N-methylpiperazinium cations, paired with BF4, Tf2N, lactate, salicylate, and benzoate anions were studied. The interaction between these fluids and graphene nanoribbons was considered by the analysis of the effect of nanoribbons width and also complex geometries such as flower-like and planar graphene flakes. Likewise, the possibility of folding of graphene nanostructures supported on SiO2 was also analyzed. The folding mechanism driven by nine ionic liquids is analyzed showing the evolution of the different interaction energies. The reported results show suitable application of ionic liquid nanodroplets for controlling the folding of graphene nanoribbons, although those supported on SiO2 surfaces could not be folded by the studied systems.
This chapter contains sections titled: Introduction Fundamentals of Membrane Gas Separation Polymeric Membranes for CO2 Separation Mixed Matrix Membranes Supported Ionic Liquid Membranes (SILMs) for CO2 Separation Conclusion Overall Comparison and Future Outlook Abbreviations
A systematic density functional theory (DFT) analysis has been carried out to obtain information at the molecular level on those factors related to efficient SO2capture by ionic liquids. A set of 55 ionic liquids, for which high gas solubility is expected, has been selected.