Abstract
The physicochemical properties of four 1-alkyl-3-methylimidazolium bromide ([CnC1im]Br, n = 5, 6, 7, 8) ionic liquids (ILs) were investigated in this work by using inverse gas chromatography (IGC) from 303.15 K to 343.15 K. Twenty-eight organic solvents were used to obtain the physicochemical properties between each IL and solvent via the IGC method, including the specific retention volume and the Flory–Huggins interaction parameter. The Hildebrand solubility parameters of the four [CnC1im]Br ILs were determined by linear extrapolation to be = 25.78 (J·cm−3)0.5, = 25.38 (J·cm−3)0.5, =24.78 (J·cm−3)0.5 and = 24.23 (J·cm−3)0.5 at room temperature (298.15 K). At the same time, the Hansen solubility parameters of the four [CnC1im]Br ILs were simulated by using the Hansen Solubility Parameter in Practice (HSPiP) at room temperature (298.15 K). The results were as follows: = 25.86 (J·cm−3)0.5, = 25.39 (J·cm−3)0.5, = 24.81 (J·cm−3)0.5 and = 24.33 (J·cm−3)0.5. These values were slightly higher than those obtained by the IGC method, but they only exhibited small errors, covering a range of 0.01 to 0.1 (J·cm−3)0.5. In addition, the miscibility between the IL and the probe was evaluated by IGC, and it exhibited a basic agreement with the HSPiP. This study confirms that the combination of the two methods can accurately calculate solubility parameters and select solvents.
Highlights
Ionic liquids (ILs), as demonstrated by green and neoteric solvent research in recent years [1,2], are salts that are commonly made up of asymmetric organic cations, and either inorganic or organic anions [3]
Liu [22] has researched the Hansen solubility parameter (HSP) of hydrogenated nitrile rubber (HNBR) by inverse gas chromatography (IGC) and Hansen Solubility Parameter in Practice (HSPiP), and has calculated the energy differences (Ra ) between HNBR and solvents or solvent mixtures according to their HSP values
1.275 a: Worry out, which means that the Hansen Solubility Parameter in Practice (HSPiP) software prediction should be in the sphere, contrary to the experimental result. b : Worry in, which means that the HSPiP software prediction should be out of the sphere, contrary to the experimental result
Summary
Ionic liquids (ILs), as demonstrated by green and neoteric solvent research in recent years [1,2], are salts that are commonly made up of asymmetric organic cations, and either inorganic or organic anions [3]. Yu [21] determined the solubility parameters of [Cn C1 im][OAC] (n = 2, 4, 6, 8) by IGC and HSPiP, and found that the results were the same This provides another method for determining the solubility parameters of ILs. Liu [22] has researched the HSP of hydrogenated nitrile rubber (HNBR) by IGC and HSPiP, and has calculated the energy differences (Ra ) between HNBR and solvents or solvent mixtures according to their HSP values. Liu [22] has researched the HSP of hydrogenated nitrile rubber (HNBR) by IGC and HSPiP, and has calculated the energy differences (Ra ) between HNBR and solvents or solvent mixtures according to their HSP values He found that the swelling volume decreases with increasing Ra values. HSPiP software is used to calculate the miscibilities and HSPs of four ILs via solubility testing, and a comparative study with the results derived from the IGC is performed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
