Evaluación de Separación de Gases Fluorados (F-GASES) utilizando disolventes eutécticos profundos como absorbentes.

Abstract

The environmental impact resulting from the release of fluorinated gases (F-gases), commonly used in refrigeration, is prompting the development of technologies to recover and recycle them. Fluorinated Ionic Liquids (FILs) have been investigated as promising candidates for the absorption and selective separation of F-gases. In this work, we prepared Deep Eutectic Solvents (DES) composed of FILs and perfluorinated acids, which allowed to explore the excellent gas solubilization properties of FILs with high melting points in a wider liquidous range. A screening of DES prepared from 5 different FILs was performed for the solubilization of 1,1,1,2- tetrafluoroethane (R-134a) at 303.15 K, using a stainless steel volumetric system. [N4444][C4F9SO3]:C4F9CO2H and [C2C1Im][C8F17SO3]:C4F9CO2H were selected as the systems with the best absorption capacities and were studied in three different FIL:perfluorinated acid ratios, for the absorption of difluoromethane (R-32), pentafluoroethane (R-125), and R-134a at 303.15 K, 313.15 K, and 323.15 K. All studied DES have ideal selectivity towards R-134a in mixtures with the other two F-gases. The results presented here provide knowledge of the behavior of these new alternative solvents for the separation of F-gases mixtures of commercial refrigerants, at three different temperatures and in a wide range of operating pressures.