Infinite Dilution Activity Coefficients in the Smectic and Isotropic Phases of Tetrafluoroborate-Based Ionic Liquids
authors Martins, MAR; Vilas-Boas, SM; Cordova, IW; Carvalho, PJ; Domanska, U; Ferreira, O; Coutinho, JAP; Pinho, SP
nationality International
journal JOURNAL OF CHEMICAL AND ENGINEERING DATA
keywords 2ND VIRIAL-COEFFICIENTS; ORGANIC SOLUTES; CHROMATOGRAPHY; MIXTURES; THERMODYNAMICS; HYDROCARBONS; ALCOHOLS; WATER; TEMPERATURE; TRANSITION
abstract Inverse gas chromatography was used to obtain the activity coefficients at infinite dilution (gamma(infinity)(13)) of several organic solutes and water in the thermotropic ionic liquid crystal phases of both [C(12)mim][BF4] and [C(14)mim][BF4] and their isotropic phases. In the smectic to isotropic transition, a change in the linear representation of the natural logarithm of gamma(infinity)(13) with the reciprocal temperature was observed for [C(14)mim][BF4], and was more evident for alkanes, alkylbenzenes, esters, and alcohols, that can be related to structural modifications of the stationary phase. Results are interpreted in terms of the enthalpic and entropic contributions of solute-IL interactions. Selectivities and capacities of important separation problems, such as octane/benzene and cyclohexane/benzene, were calculated and compared with literature values for separating agents such as N-methyl-2-pyrrolidinone, sulfolane, and ionic liquids presenting the [BF4](-) anion combined with several imidazolium-based cations. It is shown that to achieve maximum separation efficiency, imidazolium cations with short alkyl chain lengths such as [C(2)mim][BF4] should be used, whereas high capacities require larger alkyl chain lengths.
publisher AMER CHEMICAL SOC
issn 0021-9568
isbn 1520-5134
year published 2021
volume 66
issue 6
beginning page 2587
ending page 2596
digital object identifier (doi) 10.1021/acs.jced.1c00182
web of science category 10
subject category Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical
unique article identifier WOS:000662181900025
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 2.369
5 year journal impact factor 2.503
category normalized journal impact factor percentile 53.135
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg