Solubility of ethane, propane, and butane in aqueous solutions of sodium dodecyl sulfate

The solubility of ethane, propane, and butane under standard conditions in aqueous micellar solutions of sodium dodecyl sulfate with the salt concentration from 0.025 to 0.3 M was studied. The methylene group increment of the Gibbs energy of solubilization in the systems hydrocarbons (C-2-C-4)-sodium dodecyl sulfate was calculated; its value, -3.7 kJ mol(-1), is close to that in solutions with addition of 0.1 M NaCl. The thermodynamic cycle of methylene group increments of the Gibbs energies of solution of hydrocarbons in water and micellar solutions of surfactants is discussed.