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Activity coefficients at infinite dilution of organic solutes in N-formylmorpholine and N-methyl pyrrolidone from gas–liquid chromatography
The infinite dilution activity coefficients for 25 solutes (n-alkanes, alk-1-enes, alk-1-ynes, cycloalkanes, alkylbenzenes and alcohols) were measured in N-formylmorpholine (NFM) and N-methyl pyrrolidone (NMP). This was performed using the gas–liquid chromatography (glc) technique with pre-saturation of the carrier gas. The solvents that were used had significant vapour pressures at the measured temperatures and therefore pre-saturation was necessary to mitigate against solvent loss from the column. Measurements were undertaken at three temperatures, = (333.2, 348.2, and 363.2) K. The selectivities and capacities for some industrial systems of interest, typically those which are quite difficult to separate via normal distillation, were calculated from the experimental results. The activity coefficients, selectivities and capacities are discussed and compared. The work was conducted to investigate the possibility of using the studied solvents in separating alkanes (such as cyclohexane) from aromatic compounds (such as benzene) and also separating aromatic compounds (such as benzene) from alkanols (such as methanol).

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