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Pyridine and thiophene separation from hydrocarbon mixtures using DES based on choline chloride and propylene glycol – a LLE study

Classical methods for separation of mixtures into components involve the use of organic solvents which are volatile, potentially explosive and toxic. The trend is to replace harmful solvents with environmentally friendly ones. The mixture of choline chloride and propylene glycol in molar ratio of 1:3 (ChCl‐PG 1:3) belongs to a group of environmentally friendly solvents called deep eutectic solvents (DES), which are characterized by low vapor pressure, non‐flammability, biodegradability and simple preparation from non‐toxic compounds. In this work, liquid‐liquid equilibria for the six quasi‐ternary systems involving one hydrocarbon component (n‐hexane, n‐heptane or i‐octane), pyridine or thiophene and ChCl‐PG 1:3 were experimentally determined at atmospheric pressure and 25 °C in order to investigate the potential of ChCl‐PG 1:3 for the extraction of pyridine and thiophene from hydrocarbon mixtures. The equilibrium data were presented in terms of experimental tie lines and correlated with NRTL and UNIQUAC coefficient activity models. Moreover, physical properties of ChCl‐PG 1:3 important for its use as an extractive solvent (density, viscosity, refractive index, electrical conductivity and thermal properties) were measured. The obtained results indicate that ChCl‐PG 1:3 is more suitable for the removal of pyridine than thiophene from hydrocarbon mixtures.

pyridine, thiophene, DES, choline chloride, propylene glycol, LLE

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