Solubility and Diffusivity of Chlorodifluoromethane in Imidazolium Ionic Liquids: [emim][Tf2N], [bmim][BF4], [bmim][PF6], and [emim][TFES]
View/ Open
Issue Date
2019-05-31Author
Minnick, David L.
Shiflett, Mark B.
Publisher
American Chemical Society
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
Copyright © 2019 American Chemical Society
Metadata
Show full item recordAbstract
Solubility and diffusivity measurements of chlorodifluoromethane (HCFC-22) in four ionic liquids (ILs)—[emim][Tf2N], [bmim][BF4], [bmim][PF6], and [emim][TFES]—were conducted using an IGA gravimetric microbalance at temperatures between 283.2 and 348.2 K. The solubility results were modeled using the NRTL activity coefficient method and were also used to calculate Henry’s law constants (kH) at infinite dilution. van’t Hoff relationships were used to calculate the enthalpy (ΔH̅sol) and entropy (ΔS̅sol) of absorption for HCFC-22 in each IL. Time-dependent absorption data collected by the IGA microbalance was used to calculate the diffusion coefficient of HCFC-22 in each IL. The diffusion coefficient results were used to calculate the hydrodynamic radius of the solute molecule using the Stokes–Einstein relationship. The experimental results for chlorodifluoromethane and [emim][Tf2N] are compared with previous studies on trifluoromethane and other fluorocarbons to understand the impact of atom substitution (e.g., CHF2-F vs CHF2-Cl) on fluorocarbon solubility in an ionic liquid.
Collections
Citation
Ind. Eng. Chem. Res. 2019, 58, 11072−11081
Items in KU ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.
We want to hear from you! Please share your stories about how Open Access to this item benefits YOU.