TY  - BOOK
AU  - Koros,W.J.
AU  - Woods,D.G.
TI  - Elevated temperature application of polymer hollow-fiber membranes
KW  - HOLLOW-FIBER MEMBRANE
KW  - PERMEATION
N2  - Three asymmetric hollow-fiber polymer membrane systems were studied for application in elevated temperature, low feed pressure systems: (1)a single component polyaramide, (2)a single component polyimide, and (3)a composite polyimide on a polyimide/polyetherimide blend support. Permeation driving force was increased for the 2.2 psig feed pressure by sweeping an inert gas along the downstream side of the membrane. Both cocurrent and countercurrent sweep flow patterns were examined with only minimal differences found. The polyaramide membrane was stable in the entire range of temperatures tested (23-220°C). After utilizing a silicone rubber post-treatment, the membrane exhibited a hydrogen permeance of approximately 300 GPU at 175°C with a hydrogen to n-butane selectivity of 700. The polyimide-containing membranes had superior room-temperature properties; however, the thin skins aged at elevated temperatures. This aging effect decreased the permeance of the membranes approximately 40
UR  - https://drive.google.com/file/d/1aJIdws08oEKxNfKJeMeHr7FQtotYY49N/view?usp=drivesdk
ER  -