Physical Properties of 1-Butyl-3-methylimidazolium Tetrafluoroborate/N-Methyl-2-pyrrolidone Mixtures and the Solubility of CO₂ in the System at Elevated Pressures

Abstract

Densities and viscosities of 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) (1) + N-methyl-2-pyrrolidone (NMP) (2) with w 1 = 0.0000, 0.5000, 0.6999, 0.8981, and 1.0000 at T = (298.15 to 318.15) K were measured and fitted to standard equations. The results show that densities and viscosities of the hybrid solvents decrease with the increase of temperature and mass fraction of NMP. A high-pressure variable-volume view cell technique was used to determine the solubility of CO2 in pure solvents and mixtures under elevated pressures up to 6 MPa at temperatures from (298.15 to 318.15) K. The results indicate that the solubility of CO2 in the pure solvents and mixtures increases with the increase of pressure and with the decrease of temperature. The solubility of CO2 in the mixtures increases with the increase of the mass fraction of NMP, but it is very close to that in pure [bmim][BF4] as the mass fraction of NMP is around 0.1019.

A Comprehensive Study of Photorefractive Properties in Poly(ethylene glycol) Dimethacrylate— Ionic Liquid Composites

“…They are nonflammable in the liquid state in a wide range of temperatures, low or non-toxic, of a high chemical stability, high ionic conductivity and able to dissolve numerous organic, inorganic and organometallic compounds [ 25 ]. In addition, ILs are environmentally-friendly solvents in addition to being excellent absorbents of when added to other specific solvents [ 26 , 27 ]. Therefore, they are considered to be essential for green chemistry synthesis and have attracted much attention as potential alternatives to conventional volatile organic-solvent systems.…”

Excess thermodynamic properties of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate and N-octyl-2-pyrrolidone from T=(298.15 to 323.15)K at atmospheric pressure

“…15) K under atmospheric pressure, in continuation of our previous work [11]. Imidazolium based ILs can be used for extractive desulfurization of liquid fuels, mainly with regard to those S-compounds that are very complicated to eliminate by common hydrodesulfurization (HDS) process.…”

“…The Provenance, CAS number, water content, mass fraction purity, purification method and analysis method of the compounds are given in table 1. The purity of the chemicals is ascertained by comparing the experimental values of density, refractive index and speed of sound at temperatures T = (298.15 to 323.15) K with the literature (Table 2) [11,[14][15][16][17][18][19][20][21][22][23].…”

Physical Properties and CO2 Absorption Capacity of Propylene Carbonate + Poly(propylene glycol) Monobutyl Ether Systems

“…To be specific, S is similar with the parameter in Bara’s work and refers to the moles of CO 2 by per liter absorbent. These properties of commercial solvents, ,− ionic liquids, ,− and some polymer-based absorbents ,,,− were compared with those of PC + PPGME340 studied in this work.…”

“…They found that CO 2 absorption capacity and kinematic viscosity decrease with the addition of water into PEG200. Similarly, to improve the application of ionic liquid for gas treatment, hybrid absorbents using ionic liquids blended with common organic solvents or water were widely studied. − …”