A number of aqueous liquid membranes were tested to study their efficacy in flue gas desulfurization. A simulated flue gas containing SO2, CO2, O2, N2 and moisture was used as the feed gas. The candidate membrane liquids were immobilized in microporous polypropylene Celgard® 2400 films. Permeabilities of the above species through the liquid membranes and the selectivities were determined using a sweep gas technique at 25°C. The feed and sweep gases were kept at essentially atmospheric pressure. The liquids tested as membranes included water, and aqueous solutions of NaHSO3, Na2SO3, sulfolane, sulfolene, Fe2+ EDTA, and Fe3+ EDTA. Very favorable SO2 permeabilities, and SO2/CO2 and SO2/N2 selectivities were obtained using some of these immobilized liquid membranes. Experimental permeabilities of SO2 have been compared with predictions from equilibrium approximation as well as from non-equilibrium boundary layer approximation.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physical and Theoretical Chemistry
- Filtration and Separation