Abstract
This work studied the use of room temperature ionic liquids (RTILs) based on the 1- n-alkyl-3-methylimidazolium cation, in supported liquid membranes (SLMs), in order to use them as membrane materials for separation and enrichment of hydrogen from a gaseous mixture containing H 2, CO 2, and N 2. Different RTILs, with different chain length of alkyl substituents on the imidazolium cation and different anions, were incorporated in a PVDF hydrophobic membrane in order to study its effect on the permeability and on the selectivity towards the gases present in the fermentation process. Experiments were conducted in a constant pressure system and temperature (30°C), and pure gas permeability/selectivity data were reported. Supported ionic liquid membranes (SILMs) have been found to be stable at the pressure studied. The highest permeability value (30.70 × 10 −11 m 2/s) was obtained for the PVDF membrane immobilized with the RTIL [OMIM][PF 6]. The high slectivity values towards CO 2, between 22 (for [OMIM][PF 6]) and 35 (for [BMIM][BF 4]), obtained indicates that these SILMs could be used for this process.
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