Effects of shear rate and forced convection residence time on asymmetric polysulfone membranes structure and gas separation performance
The objectives of this study are to illustrate the effects of shear rate and forced convection residence time on asymmetric polysulfone membrane structure and gas separation performance. The membranes were produced by a simple dry/wet phase inversion technique using a pneumatically-controlled flat s...
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| Format: | Article |
| Language: | English |
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Elsevier
2003
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| Online Access: | http://eprints.utm.my/776/ http://eprints.utm.my/776/1/ |
| _version_ | 1848889993857073152 |
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| author | Ismail, A. F. Ng, B. C. Abdul Rahman, W. A. W. |
| author_facet | Ismail, A. F. Ng, B. C. Abdul Rahman, W. A. W. |
| author_sort | Ismail, A. F. |
| building | UTeM Institutional Repository |
| collection | Online Access |
| description | The objectives of this study are to illustrate the effects of shear rate and forced convection residence time on asymmetric polysulfone membrane structure and gas separation performance. The membranes were produced by a simple dry/wet phase inversion technique using a pneumatically-controlled flat sheet membrane casting system. Varying the casting speed varied shear rate. Rheologically induced molecular orientation in membranes during casting was measured directly using plane polarized reflectance infrared spectroscopy technique. The highly sheared asymmetric membranes tend to exhibit greater molecular orientation in the skin layer. Thus, a high pressure-normalized flux and selectivity were obtained. The mean pressure-normalized fluxes of O2 and CO2 were about 5.05 and 11.41 GPU, respectively. The selectivity of O2/N2 and CO2/CH4 were approximately 6.72 and 32.63, respectively, at shear rate of 367 s1. However, increasing forced convection residence time in the dry phase inversion step resulted in lower pressurenormalized flux but higher selectivity membrane. The best membrane performance obtained based on the trade-off between pressure-normalized flux and selectivity was observed at forced convection residence time of 20 s and at 367 s1 shear rate. |
| first_indexed | 2025-11-15T20:35:00Z |
| format | Article |
| id | utm-776 |
| institution | Universiti Teknologi Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T20:35:00Z |
| publishDate | 2003 |
| publisher | Elsevier |
| recordtype | eprints |
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| spelling | utm-7762010-10-25T09:33:21Z http://eprints.utm.my/776/ Effects of shear rate and forced convection residence time on asymmetric polysulfone membranes structure and gas separation performance Ismail, A. F. Ng, B. C. Abdul Rahman, W. A. W. TP Chemical technology The objectives of this study are to illustrate the effects of shear rate and forced convection residence time on asymmetric polysulfone membrane structure and gas separation performance. The membranes were produced by a simple dry/wet phase inversion technique using a pneumatically-controlled flat sheet membrane casting system. Varying the casting speed varied shear rate. Rheologically induced molecular orientation in membranes during casting was measured directly using plane polarized reflectance infrared spectroscopy technique. The highly sheared asymmetric membranes tend to exhibit greater molecular orientation in the skin layer. Thus, a high pressure-normalized flux and selectivity were obtained. The mean pressure-normalized fluxes of O2 and CO2 were about 5.05 and 11.41 GPU, respectively. The selectivity of O2/N2 and CO2/CH4 were approximately 6.72 and 32.63, respectively, at shear rate of 367 s1. However, increasing forced convection residence time in the dry phase inversion step resulted in lower pressurenormalized flux but higher selectivity membrane. The best membrane performance obtained based on the trade-off between pressure-normalized flux and selectivity was observed at forced convection residence time of 20 s and at 367 s1 shear rate. Elsevier 2003-11-01 Article PeerReviewed application/pdf en http://eprints.utm.my/776/1/ Ismail, A. F. and Ng, B. C. and Abdul Rahman, W. A. W. (2003) Effects of shear rate and forced convection residence time on asymmetric polysulfone membranes structure and gas separation performance. Separation and Purification Technology, 33 (3). pp. 255-272. ISSN 1383-5866 http://dx.doi.org/10.1016/S1383-5866(03)00009-1 doi:10.1016/S1383-5866(03)00009-1 |
| spellingShingle | TP Chemical technology Ismail, A. F. Ng, B. C. Abdul Rahman, W. A. W. Effects of shear rate and forced convection residence time on asymmetric polysulfone membranes structure and gas separation performance |
| title | Effects of shear rate and forced convection residence time on asymmetric polysulfone membranes structure and gas separation performance |
| title_full | Effects of shear rate and forced convection residence time on asymmetric polysulfone membranes structure and gas separation performance |
| title_fullStr | Effects of shear rate and forced convection residence time on asymmetric polysulfone membranes structure and gas separation performance |
| title_full_unstemmed | Effects of shear rate and forced convection residence time on asymmetric polysulfone membranes structure and gas separation performance |
| title_short | Effects of shear rate and forced convection residence time on asymmetric polysulfone membranes structure and gas separation performance |
| title_sort | effects of shear rate and forced convection residence time on asymmetric polysulfone membranes structure and gas separation performance |
| topic | TP Chemical technology |
| url | http://eprints.utm.my/776/ http://eprints.utm.my/776/ http://eprints.utm.my/776/ http://eprints.utm.my/776/1/ |