A novel ethanol dehydration process by forward osmosis

Zhang, Xiwang, Ning, Ziyao, Wang, David K. and Diniz da Costa, Joao C. (2013) A novel ethanol dehydration process by forward osmosis. Chemical Engineering Journal, 232 397-404. doi:10.1016/j.cej.2013.07.106

Author Zhang, Xiwang
Ning, Ziyao
Wang, David K.
Diniz da Costa, Joao C.
Title A novel ethanol dehydration process by forward osmosis
Journal name Chemical Engineering Journal   Check publisher's open access policy
ISSN 1385-8947
Publication date 2013
Sub-type Article (original research)
DOI 10.1016/j.cej.2013.07.106
Open Access Status
Volume 232
Start page 397
End page 404
Total pages 8
Place of publication Amsterdam,The Netherlands
Publisher Elsevier BV
Collection year 2014
Language eng
Subject 1500 Chemical Engineering
1600 Chemistry
2209 Industrial and Manufacturing Engineering
2304 Environmental Chemistry
Abstract Bioethanol, one of the alternative energy sources, has drawn increasing attention as a potential solution of energy crisis and global warming. However, the current ethanol dehydration processes are still energy intensive. In this study, the feasibility of ethanol dehydration by forward osmosis (FO) was systematically investigated using a commercial cellulose triacetate membrane containing a dense film (active layer) and a porous substrate. The results showed that water can be removed from ethanol solutions to potentially produce an ethanol solution of 90wt%. The ethanol concentration and membrane orientation have significant impact on the membrane performance in term of membrane flux, reverse salt flux and forward ethanol flux. For instance, higher total fluxes and lower reverse salt flux when the active layer faces the draw (salt) solution instead of the porous substrate. However, the forward ethanol flux is significantly high in both of the orientations, being 1420-2249gh-1m-2 at the 75% ethanol feed concentration. The membrane durability study over the 30days of exposure in 30% and absolute ethanol solutions indicates that the membrane performance deteriorates which is caused by the membrane active layer undergoing chemical modification. The results provide a general proof of concept and scientific understanding into the FO dehydration process and FO membrane development.
Keyword Bioethanol
Forward ethanol flux
Forward osmosis
Reverse salt flux
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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