Activity Coefficient at Infinite Dilution Study of Molecular Interaction-Selectivity in Separation Processes

• Published in: International journal of thermophysics Vol. 41; no. 9
• Main Authors: Li, Cailian, Ban, Tao, Wang, Qiang
• Format: Journal Article
• Language: English
• Published: New York Springer US 2020; Springer Nature B.V
• Subjects: Activity coefficients; Benzene; Classical Mechanics; Condensed Matter Physics; Dilution; Enthalpy; Erythrocytes; Expanding universe theory; Gas chromatography; Geophysics; Gibbs free energy; Heptanes; Hydrocarbons; Industrial Chemistry/Chemical Engineering; Inverse gas chromatography; Ionic liquids; Mathematical analysis; Molecular interactions; Physical Chemistry; Physics; Physics and Astronomy; Selectivity; Separation; Solubility parameters; Thermodynamics; Activity coefficient at infinite dilution; Hildebrand solubility parameter; Ionic liquid
• ISSN: 0195-928X; 1572-9567
• DOI: 10.1007/s10765-020-02698-5

The activity coefficient at infinite dilution for 47 selected organic solutes in 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) ionic liquid (IL) was determined at 303.15 K to 343.15 K through inverse gas chromatography (IGC). The partial molar excess enthalpy, entropy, Gibbs free energy at infinite dilution, and Hildebrand solubility parameters were obtained from the values of activity coefficient at infinite dilution. The selectivity and capacity of heptane/thiophene, heptane/benzene and benzene/thiophene separation problems were also calculated based on the activity coefficient at infinite dilution values. The selectivity of three separation problems of [AMIM]Cl was 85.36, 30.65 and 2.79, which indicated that [AMIM]Cl is an ideal solvent for the separation of heptane/thiophene.