关键词:

离子液体, 二氧化碳, 萘, 溶解度, 相平衡

Abstract:

The concentrations of naphthalene in CO₂-rich phase for the ternary system CO₂ + ［bmim］［PF₆］+ naphthalene were determined by a static method with online high-pressure ultraviolet detection, under the conditions of naphthalene molality in the liquid phase ranging from 0.0169 to 0.378 mol·kg^-1, and temperature 313—333 K,pressure 8—20 MPa.It was found that the naphthalene mole fraction in the CO₂-rich phase decreased with increasing temperature, increased with increasing pressure, and decreased with decreasing naphthalene concentration in the liquid phase.The logarithm of naphthalene mole fraction in the CO₂-rich phase was shown to be approximately linear, at the same temperature and pressure, with the logarithm of naphthalene concentration in the liquid phase.All the solubility data were correlated to the Chrastil’s association model and the mean relative deviation was found to be 14.9%.Moreover, operation modes of supercritical CO₂ extraction were discussed base on the solubility data.It was found that batch operation was better than continuous operation for organics extraction from ionic liquids using supercritical CO₂.

Key words:

离子液体, 二氧化碳, 萘, 溶解度, 相平衡