Investigation of the process of supporting ionic liquids on polymer membranes for CO2 separation from CO2/hydrocarbon gas mixture
Abstract
Some 1-butyl-3-methyl-imidazolium based ionic liquids were supported on polyethersulfone, polyvinylidene fluoride, cellulose acetate membranes to form supported ionic liquid membranes (SILMs). The preparation of SILMs was performed by soaking membranes in the ionic liquids. The amount of ionic liquid supported on membranes was determined by weighing membranes before and after soaking in ionic liquid. SILMs were characterised by scanning electron microscopy (SEM). Ionic liquids filled up the pore and covered the surface of the membranes. The permeability of CO2 and CH4 through 1-n-butyl-3-methyl-imidazolium tetrafluoroborate supported polyvinylidene fluoride membrane was investigated. The high selectivity of CO2/CH4 gas mixture shows that SILM can be used for CO2 separation.
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