Mass transfer of water vapor in a hollow fiber for degassing processes

✍ Scribed by Hideyuki Murata; Yasushi Tomita; Makoto Miyashita; Kazunari Sakai; Masayuki Toda; Tadahiro Ohmi

• Publisher: American Institute of Chemical Engineers
• Year: 1999
• Tongue: English
• Weight: 186 KB
• Volume: 45
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690450403

✦ Synopsis

The mass-transfer mechanisms of water ®apor in hollow-fiber membrane modules used to remo®e gases from water were studied experimentally and theoretically. Hollowfiber modules for degassing are widely used in ®arious industries, including ultrapure water production. Although these modules perform extremely well, a general principle for the design has not been established. Recently, ®ery highly efficient asymmetric hollow-fiber modules were de®eloped, that could reduce the dissol®ed oxygen to less than 1 ( ) grL 1 ppb . From our studies of the modules, it was found that the mass transfer of water ®apor plays an extremely important role in the flow in the lumen side of the hollow fibers. The establishment of a theoretical design method for degassing modules can be expected from our studies.