Three commercially available films and a vinylidene fluoride film modified with sulfolene were tested for the separation of carbon dioxide from carbon dioxide, methane and water vapor mixtures. Flux and separation factor values were obtained over a temperature range from 23 to 90°C and a feed gas moisture content from 0.0 to 1.32%. A feed gas containing 60% carbon dioxide and 40% methane on a dry basis was used at an operating pressure of 2068 kPa. The commercially available films tested were cellulose acetate, polysulfone and polyethersulfone. All three films provided good separation. For example, the polysulfone film produced a permeate containing 96.0% carbon dioxide at room temperature and 0.12% water. Separation factor values for carbon dioxide ranged from 4.6 to 45.1. Flux values for the commercial films ranged from less than 10.E-05 to 1.9xl0E-03 cu cm(STP)/sq cm(sec). The sulfolene modified film also provided good separation. Separation factor values for carbon dioxide ranged from 9.6 to 33.6. Flux values ranged from 10.E-05 to 5.7xl0E-05 cu cm(STP)/sq cm(sec). Strong trends towards increasing flux and decreasing percentage of carbon dioxide in the permeate with increasing temperature were observed with all films. A trend towards decreasing percentage of carbon dioxide in the permeate with increasing water content was observed with cellulose acetate, polysulfone and polyethersulfone films. These films demonstrated a strong trend towards increasing flux with increasing water content at low levels of water content. As the feed stream approached saturation, gas flux tended to become constant or actually decrease. The sulfolene modified film tended towards constant or increasing percentage of carbon dioxide in the permeate with increasing water content. The flux tended to remain constant or decrease with increasing water content.
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