Solubility of carbon dioxide in systems with [bmim][BF4] and some selected organic compounds of interest for the pharmaceutical industry

Abstract

This work presents phase equilibrium data of the ternary system CO₂ + [bmim][BF₄] + solute. Three different organic compounds were studied as the solute in the ternary system: 1-methyl-3-phenylpiperazine (MPhPz), 2-chloro-nicotinonitrile (NtN) and 2-(4-methyl-2-phenyl-1-piperazinyl)-3-pyridinecarbonitrile (PCN). Experiments were carried out in a pressure and temperature range of 1–14 MPa and 343.15–443.15 K, respectively. Samples were prepared with CO₂ molar fractions of 0.10 until 0.40 for the system with NtN as the solute, and 0.20 for the other two systems for comparison. The data collected show how the various solutes affect the phase behavior of the binary system CO₂ + [bmim][BF₄], and at which conditions homogeneous phase can be obtained.