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The work provides experimental data of the methyl trifluoroacetate (MeTFA)-2,2,2-trifluoroacetic acid (TFA) mixture distillation process in the presence of N-Methyl-2-pyrrolidone (NMP) at atmospheric pressure (99.2 kPa) and within a temperature range of T ≤ 230 C. Forming PIL between TFA and NMP (methylpyrrolidonium trifluoroacetate [HNMP] + [CF 3 COO] À ) leads to a significant volatility increase of the MeTFA relative to TFA. The pure MeTFA was recovered from the MeTFA-TFA-[HNMP] + [CF 3 COO] À mixture in the quantity of 70% from the MeTFA initial mole charge; the total mole recovery was 100%. A significant result of the above experiment is that TFA mole recovery from the MeTFA-TFA-[HNMP] + [CF 3 COO] À mixture within a temperature range of T < 187 C exceeds 96%. The distillation of TFA and NMP mixture at T ≤ 230 C demonstrates strong binding of TFA anion that can be seen from the final liquid phase composition TFA/NMP ≈ 0.53/0.47. At the concentration and the temperature ranges under study, there is no NMP in the vapour phase.

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Experiments are carried out to determine, under comparable conditions, the mass-transfer efficiency of a packed column in catalytic distillation of a chemically reactive mixture and in multicomponent distillation of the same mixture that is uncomplicated by chemical transformations. The reactive distillation process involves the reversible equimolar reaction of transesterification between butyl acetate and ethanol to form butanol and ethyl acetate. It is shown that the experimental data on the packed zone of the column are satisfactorily fitted by an equilibrium cascade model. The number of stages in the cascade is found from the Fenske-Underwood equation. In the experiments performed, both in the catalytic distillation and in the multicomponent distillation uncomplicated by chemical transformations, the height equivalent to a cascade stage is the same (20 cm).