โ Scribed by Ronald Hughes; Boquan Jiang
No coin nor oath required. For personal study only.
have been made of the permeability of nitrous oxide (N20), carbon dioxide (CO*) and oxygen (02) through silicone rubber and cellulose acetate membranes using a flat sheet permeator.
Measurements have also been made of individual gas permeabilities from a mixed feed stream. N20 had the highest permeability when using the silicone rubber membrane, followed by C02, with O2 an order of magnitude less. All three gas permeability coefficients were independent of feed pressure for this membrane and N20 and COz permeability coefficients were temperature independent.
For the cellulose acetate membrane, N20 and CO2 permeabilities varied with feed pressure and all three gases gave positive temperature coefficients.
No separation of CO2 from N20 could be achieved under any conditions with the cellulose acetate membrane.
๐ SIMILAR VOLUMES
Mean permeability coefficients for CHI and COz (PcH, and pco2) in cellulose acetate (CA, DS = 2.45) were determined at 35ยฐC (95'F) and at pressures up to about 54 atm (800 psia). The measurements were made with pure CHI and COP as well as with CH4/C02 mixtures containing 9.7, 24.0, and 46.1 mol % CO
Transient permeation of oxygen, nitrogen, and carbon dioxide through certain cellulose acetate (CA) dense membranes made from solutions in dioxane and dioxane-added ethanol were studied by the flow method. In order to explain the overshoots for transient permeation rates in the latter case, a new mo