Gas transport properties of polyaniline membranes

✍ Scribed by Min-Jong Chang; Yun-Hsin Liao; Allan S. Myerson; T. K. Kwei

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 656 KB
• Volume: 62
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19961128)62:9<1427::aid-app12>3.0.co;2-w

✦ Synopsis

The transport properties of He, H P , COP, 02, NP, and CH, gases in solvent cast, HCl doped, and undoped polyaniline (PANi) membranes were determined. Measurements were carried out a t 40 psi pressure from 19°C to 60°C. An excellent correlation was found between the diffusion coefficients and the molecular diameters of gases. The solubility coefficients of gases were found to correlate with their boiling points or critical temperatures. The separation factors for CO,/N, and CO,/CH, are dominated by the high solubility of COP. These correlations enable us to predict the permeability, diffusion, and solubility coefficients of other gases. After the doping-undoping process, the fluxes of gases with kinetic diameters smaller than 3.5 8, increased but those of larger gases decreased. This results in a higher separation factor for a gas pair involving a small gas molecule and a larger one. 0 1996 John Wiley & Sons, Inc.