Gaseous absorption of fluorinated ethanes by ionic liquids

• Solubilities of five fluorinated ethanes in [P(14)666][TMPP] were presented.
• The interaction of the fluorinated ethanes with ionic liquids were investigated.
• A modified Krichevsky–Kasarnovsky equation was used to model experimental data.

Solubilities of 1,1-difluoroethane (R152a), pentafluoroethane (R125), fluoroethane (R161), 1,1,1-trifluoroethane (R143a) and 1,1,1,2-tetrafluoroethane (R134a) in trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl) phosphinate ([P(14) 666][TMPP]) from 302.2 K to 343.6 K and up to 1.14 MPa are presented in this work. Effects of fluorine atoms of fluorinated ethanes, the cations and anions of ionic liquids on the solubility behaviors are investigated by comparing the solubilities of fluorinated ethanes and ethane in different ionic liquids. Moreover, the partial molar enthalpies and partial molar entropies of solutions at infinite dilution limit for R161, R143a, R125, R134a and R152a in [P(14) 666][TMPP] are obtained. The experimental results are successfully correlated with a modified Krichevsky–Kasarnovsky equation.

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