Thermodynamic study on carbon dioxide and methane permeability in polyvinylchloride/ionic liquid blends

摘要

In the present study, to improve separation proficiency of polyvinyl chloride (PVC) membrane, polyvinyl chloride is combined with 1-butyl-4-methylpyridinium ionic liquids ([B4MPyr][X]) with different anions bromide, [Br](-), chloride, [Cl](-), thiocyanate, [SCN](-), and tetrafluoroborate, [BF4]. The prepared PVC/[B4MPyr][X] blend membranes were characterized by differential scanning calorimetry (DSC) analyses. The prepared membrane morphology was investigated by Scanning Electron Microscope (SEM). The effects of feed pressure, temperature and, different of anions on the performance of blend membrane were surveyed. The results reveal that the permeability of methane and carbon dioxide gases in the PVC/[B4MPyr][X] blevapournd membranes were reduced with an increase in feed pressure while the ideal selectivity of CO2/CH4 was increased with an increase in feed pressure. Moreover, the permeability of CH4 and CO2 gases in the PVC/[B4MPyr][X] blend membranes are increased with an increase in temperatures while the ideal selectivity of CO2/CH4 was decreased with increasing temperatures. Also, the PVC/[B4MPyr][SCN] membrane has a higher performance for the separation of CO2 and CH4 gases in comparing with others membranes. (C) 2020 Elsevier