Abstract
Liquid—liquid equilibria at 101.3 kPa are determined on four partially miscible systems of the type: carboxylic acid + tertiary amine + hydrocarbon, (1) acetic acid + dimethyl formamide + cyclohexene at 291.15 K, 293.15 K, 295.15 K and 296.15 K, (2) dichloroacetic acid + N-formylpiperidine + cyclohexane at 291.15 K, 293.15 K, 298.15 K, 303.15 K and 305.15 K, (3) dichloroacetic acid + 1-methyl-2-pyrrolidinone + cyclohexene at 273.15 K, 281.15 K, 289.15 K, 291.15 K and 293.15 K, (4) dichloroacetic acid + 1-methyl-2-pyrrolidinone + 1-hexene at 293.15 K, 303.15 K and 313.15 K. All systems exhibit true ‘island’ miscibility gaps with no tendency of the closed binodal curves to touch the sides of the Gibbs phase triangle on lowering of the temperature. A qualitative interpretation of the miscibility gaps in terms of the solvation of the polar intermolecular compounds being formed between the acid and the amine in the molar ratio 1:1 is given.
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