Solubility of CF4 in lower alcohols

This work is inserted in a research program that consists mainly in the experimental and theoretical study of the effect of association/solvation between solute and solvent molecules in the solubility of gases in liquids. The solubilities of tetrafluoromethane in lower alcohols (methanol, ethanol, 1-propanol, 1-butanol) have been determined in the temperature range of 288–308 K, at atmospheric pressure, using an automated apparatus recently assembled in our laboratory. An accuracy of 0.6% and a precision of the same order of magnitude was achieved. The solubility is the lowest in methanol which is the highest associated alcohol and increases with the C-content of the alcohol. The molar Gibbs energy, enthalpy and entropy of solution were calculated from the experimental results (at 1 atm partial pressure of the gas and 298 K). A semiempirical correlation between the solubility of CF4 in alcohols at 298 K and the Gutmann acceptor number (AN) of the solvents has been developed.