Composite membranes of cellulose acetate dense films on fine paper supports for gas separation application
- Authors
- 류원선
- Issue Date
- 27-Apr-2017
- Publisher
- 한국화학공학회
- Citation
- Theories and Applications of Chemical Engineering, v.23, no.1, pp.850 - 850
- Journal Title
- Theories and Applications of Chemical Engineering
- Volume
- 23
- Number
- 1
- Start Page
- 850
- End Page
- 850
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/5873
- Abstract
- Composite membranes of cellulose acetate (CA) dense skins on fine paper supports were prepared by spin-coating from cyclohexanone and DMF solution. The morphology of membrane surfaces and cross-sections was examined by scanning electron microscopy, and the thickness of polymer skin layers was observed from several hundred nanometers to several micrometers depending on spin-coating condition. Gas separation performances of the membranes were evaluated from permeation measurements on each pure gas of hydrogen, carbon dioxide, methane, nitrogen and the binary 50:50 mixtures of H2/CH4, CO2/CH4, CO2/N2 under 4 atm, 35 ℃. Permeabilities in CA films of several-micrometer thickness were measured as 11, 7, 0.35, and 0.2 barrer for hydrogen, carbon dioxide, methane, and nitrogen, respectively. For the separation of CO2/CH4 mixture, the selectivity increased from 1.9 to 20 as the CA skin thickness increased from 0.52 to 3.7 micrometer. For H2/CH4 mixture, the ideal perm-selectivity exceeded experimental selectivity determined from permeation experiments of the 50:50 mixture. The experimental selectivity increased from 2.8 to 32 as the skin thickness increased from 0.65 to 3.7 micrometer.
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