Solubility of HFCs in lower alcohols |
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Authors: | JMMV SousaJPB Almeida AGM FerreiraHC Fachada IMA Fonseca |
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Institution: | a Departamento de Engenharia Química, Universidade de Coimbra, Pólo II, Rua Sílvio Lima, 3030-790 Coimbra, Portugal b Departamento de Engenharia Química e Biológica, Instituto Politécnico de Coimbra, 3030-199 Coimbra, Portugal c Departamento de Engenharia Electrotécnica, Instituto Politécnico de Coimbra, 3030-199 Coimbra, Portugal |
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Abstract: | This work is inserted in a research program that consists mainly in the experimental and theoretical study of the effect of association between solute and solvent molecules in the solubility of gases in liquids.The solubilities of hydrofluorocarbons, HFCs, (CH3F, CH2F2, CHF3) in lower alcohols (methanol, ethanol, 1-propanol, 1-butanol) have been determined in the temperature range 284, 313] K, at atmospheric pressure. An automated apparatus based on Ben-Naim-Baer and Tominaga et al. designs was used, which provides an accuracy of 0.6%. A precision of the same order of magnitude was achieved.To represent the temperature dependence of the mole fraction solubilities, the equation R ln x2 = A + B/T + C ln T was used. From this equation, the experimental Gibbs energies, enthalpies and entropies of solution at 298 K and 1 atm partial pressure of the gas, were calculated.A semiempirical correlation has been developed between the solubilities of HFCs in alcohols at 298 K and the Gutmann acceptor number of solvents, AN, and reduced dipole moment of the gases, μ*. |
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Keywords: | G/L solubility HFCs Alcohols Acceptor number Reduced dipole moment |
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