Gas transport through polyethylene membranes

✍ Scribed by Emma Soles; J. M. Smith; W. R. Parrish

• Publisher: American Institute of Chemical Engineers
• Year: 1982
• Tongue: English
• Weight: 594 KB
• Volume: 28
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690280316

✦ Synopsis

Abstract

Transport rates were measured by monitoring the pressure decay between two reservoirs connected by a polyethylene membrane. The diffusion equation was integrated to obtain a relation between the pressure difference across the reservoirs and the time, with solubility, expressed by Henry's law constant H, and the diffusivity D as parameters. A procedure was developed whereby both H and D are evaluated from a single set of Δ__p__ vs. t measurements. For argon in low‐density polyethylene, H and D at 323 K were 35[kg·mo]/(m^3^ of gas)/[kg·mol/(m^3^ of polymer)] and 2.1 × 10^−10^ m^2^/s, respectively. For the high‐density sample these values were 38.7 and 1.11 × 10^−10^ at 298.1 K.