Initial flux decline of the cellulose acetate butylate membranes with time under RO performance
✍ Scribed by Y. Mashiko; Y. Kurokawa; S. Saito
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 462 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0011-9164
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✦ Synopsis
Initial flux decline, i .e . compaction, has been investigated for the cellulose acetate butylate membrane prepared by varying casting condition . The compaction behavior of membranes prepared in a short evaporation period was different from that prepared in a long evaporation period . Compression tests showed that the membrane thinned by 30 .,, 40% instantaneously when pressurized ; afterwards it thinned gradually . This corresponded to the behavior of decline. It appears that a change in decline occurs reflecting membrane structure depending on casting condition . The results were discussed for a pore model based on Kozeny-Cayman equation and on the viscoelastic deformation model. SYMBOLS a, b -constants of compaction rates • -elastic modulus of a spring JW -volume flux, ml /cm' -h • -surface area of membrane, em 2