Simulation of binary gas separation through multi-tube molecular sieving membranes at high temperatures

Ji, Guozhao, Wang, Guoxiong, Hooman, Kamel, Bhatia, Suresh and da Costa, Joao C. Diniz (2013) Simulation of binary gas separation through multi-tube molecular sieving membranes at high temperatures. Chemical Engineering Journal, 218 394-404. doi:10.1016/j.cej.2012.12.063


Author Ji, Guozhao
Wang, Guoxiong
Hooman, Kamel
Bhatia, Suresh
da Costa, Joao C. Diniz
Title Simulation of binary gas separation through multi-tube molecular sieving membranes at high temperatures
Journal name Chemical Engineering Journal   Check publisher's open access policy
ISSN 1385-8947
1873-3212
Publication date 2013-02-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.cej.2012.12.063
Open Access Status Not yet assessed
Volume 218
Start page 394
End page 404
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 1600 Chemistry
2304 Environmental Chemistry
1500 Chemical Engineering
2209 Industrial and Manufacturing Engineering
Abstract An experimentally validated theoretical model was developed to investigate the influence of operating conditions on the performance of a multi-tube membrane module containing cobalt oxide silica (COxS) membranes with molecular sieving properties. The model investigated the separation process for a binary gas mixture consisting of H and Ar at 400°C. Engineering parameters such as feed flow rate, feed pressure, module size and flow configuration were systematically varied in order to optimise the separation performance promoting three main goals: H yield, H purity and H recovery. Changing these parameters led to different flows and H fractions in the feed domain, thus altering the driving forces for the preferential permeation of H. The simulated results suggest that gas separation was greatly improved by reducing the module radius which meets all of the three aforementioned optimisation criteria. Interestingly, increasing the feed flow rate and feed pressure were found to be beneficial but the former led to lower H recovery whilst the latter did not deliver the same purity when compared to lower feed pressure. In addition, two flow configurations, counter-current and co-current, were compared. It was observed that the results of counter-current were effectively the same as the co-current. This was attributed to the high gas-through-gas diffusion for high-temperature membrane operation. Finally, neglecting diffusion effects, or considering advection only, leads to over prediction of H permeate molar fraction.
Formatted abstract
An experimentally validated theoretical model was developed to investigate the influence of operating conditions on the performance of a multi-tube membrane module containing cobalt oxide silica (COxS) membranes with molecular sieving properties. The model investigated the separation process for a binary gas mixture consisting of H2 and Ar at 400°C. Engineering parameters such as feed flow rate, feed pressure, module size and flow configuration were systematically varied in order to optimise the separation performance promoting three main goals: H2 yield, H2 purity and H2 recovery. Changing these parameters led to different flows and H2 fractions in the feed domain, thus altering the driving forces for the preferential permeation of H2. The simulated results suggest that gas separation was greatly improved by reducing the module radius which meets all of the three aforementioned optimisation criteria. Interestingly, increasing the feed flow rate and feed pressure were found to be beneficial but the former led to lower H2 recovery whilst the latter did not deliver the same purity when compared to lower feed pressure. In addition, two flow configurations, counter-current and co-current, were compared. It was observed that the results of counter-current were effectively the same as the co-current. This was attributed to the high gas-through-gas diffusion for high-temperature membrane operation. Finally, neglecting diffusion effects, or considering advection only, leads to over prediction of H2 permeate molar fraction.
Keyword Binary gas separation
Hydrogen
Molecular sieving membrane
Multi-tube module
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 29 December 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
School of Chemical Engineering Publications
Official 2014 Collection
 
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