Production of pure oxygen from BSCF hollow fiber membranes using steam sweep

Leo, Adrian, Liu, Shaomin and Diniz da Costa, João C. (2011) Production of pure oxygen from BSCF hollow fiber membranes using steam sweep. Separation and Purification Technology, 78 2: 220-227. doi:10.1016/j.seppur.2011.02.006


Author Leo, Adrian
Liu, Shaomin
Diniz da Costa, João C.
Title Production of pure oxygen from BSCF hollow fiber membranes using steam sweep
Language of Title eng
Journal name Separation and Purification Technology   Check publisher's open access policy
Language of Journal Name eng
ISSN 0950-4214
0956-9618
1383-5866
1873-3794
Publication date 2011-04-11
Sub-type Article (original research)
DOI 10.1016/j.seppur.2011.02.006
Volume 78
Issue 2
Start page 220
End page 227
Total pages 8
Place of publication East Park, Kidlington, Oxford, U.K.
Publisher Pergamon
Collection year 2012
Language eng
Formatted abstract
In this work, BSCF hollow fiber membranes made from a phase inversion/sintering technique produced high purity oxygen (>99.5%) at high flow rate of 9.52 ml min−1 cm−2 at 950 °C using a steam sweep gas. Long term exposure to steam sweep gas revealed loss of performance. For instance, oxygen flux remained stable up to 20 h, though undergoing a significant reduction afterwards. Similarly, the oxygen purity reduced after 40 h testing, though less significantly as oxygen fluxes. We found that steam leached the elements of BSCF, mainly forming an extra layer of insoluble carbonates of barium and strontium. This was attributed to the reaction of the perovskite with carboxylic acid ever present in steam. In addition, steam exposure at high temperature reduced the area of diffraction and crystallite sizes of the reflective planes of the BSCF membrane, thus indicating that the steam exposure deteriorated the crystal ordering. The membrane area exposed to steam become porous while covered with a porous layer of carbonates of barium and strontium, thus limiting the oxygen surface kinetics and explaining the oxygen flux reduction over time.

Research highlights: ► Oxygen flux increased as a function of the steam sweep flow rate and temperature, reaching 9.52 ml min−1 cm−2 at 950 °C. ► Oxygen flux remained stable up to 20 h, though undergoing a significant reduction afterwards, while oxygen purity reduced after 40 h testing. ► Steam leached the elements of BSCF, mainly forming an extra porous layer of insoluble carbonates of barium and strontium. ► Carboxylic acid ever present in steam, in addition to steam at high temperatures, deteriorated the BSCF over long exposures in excess of 40 h.
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 2012 Collection
 
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Created: Tue, 06 Mar 2012, 09:12:12 EST by Joe Diniz Da Costa on behalf of School of Chemical Engineering