Synthesis, Characterization, and Impregnation of Some Ionic Liquids on Polymer Membrane for Separation of Carbon Dioxide from Its Mixture with Methane

Abstract

Some 1-alkyl-3-methylimidazolium-based ionic liquids were synthesized, characterized, and immobilized on membranes to form supported ionic liquid membranes. The supported ionic liquid membranes were characterized by SEM. The initial transmembrane pressures were investigated for each type of impregnated membrane. The CO 2 /CH 4 single gas and mixed gas permeability (CO 2 and CH 4) have been investigated. The results showed that the CO 2 /CH 4 ideal selectivities and mixed gas selectivities reached 15.45-23.9 and 13.91-22.82, respectively (equivalent to separation yields of 93.3-95.98 %). The 1-alkyl-3-methylimidazolium acetate impregnated membrane leads to a slightly lower CO 2 /CH 4 selectivity, however, this ionic liquid is stable, free of halogen and has a low price. The impregnated membranes prepared from polyvinylidene fluoride are more stable than those from polyethersulfone support, and have a higher affinity for CO 2 compared to other gas. The obtained high CO 2 /CH 4 selectivities indicate that immobilized membranes can be used for CO 2 separation processes.

High-performance particulate matter including nanoscale particle removal by a self-powered air filter

“…Preparation of ILP composites. Acetate ILs 1-alkyl-3-methylimidazolium acetate ([C n mim][OAc]) were synthesized through a two-step method according to the literature procedures 50,51 . In the first step, 1-methyl imidazolium and alkyl chloride were stirred at 70-75°C for 100 h to synthetise 1-alkyl-3-methyl imidazolium chloride ([C n mim]Cl).…”

A Review on Ionic Liquid Gas Separation Membranes

“…SLIMs based on 1-alkyl-3-methylimidazolium acetate showed high final purity (93.3–95.98%) in CO 2 /CH 4 mixed gas separation, and the selectivity increased with the number of carbon atoms in the 1-alkyl side chain. Although this type of ionic liquid is stable, free of halogen, and has a low price, a disadvantage is a slightly lower CO 2 /CH 4 selectivity [ 94 ].…”