Facilitated transport ceramic membranes for high temperature gas cleanup [electronic resource]
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| Online Access: |
Online Access |
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| Corporate Authors: | , |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Dept. of Defense ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1992.
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| Subjects: |
| Abstract: | The H[sub 2]S flux through a molten carbonate/ceramic membrane is expected to depend on the extent of the reaction of H[sub 2]S with the molten carbonate, that is, the equilibrium constant and K[sub l] for reaction (1). Values of K[sub 1] can be obtained by absorption experiments in which molten carbonate mixtures are exposed to gas mixtures containing H[sub 2]S and other IGCC gases. The details of such experiments and the apparatus used have been described previously. For the carbonate mixture described above and a feed gas mixture containing 10.7% H[sub 2]S, 6.4% CO[sub 2], 81.1% CH[sub 4] and 1.8% H[sub 2], a value of K[sub l] of 0.24 atm was obtained at 560[degrees]C. This value is reasonable when compared to the literature value of 1.7 atm at 750[degrees]C. Subsequent attempts to reproduce this result were unsuccessful. Aluminum nitride and lithium aluminate were determined to be the best choices for further development as ceramic membrane supports based on results from a series of initial screening experiments which were previously described. These experiments indicated that A1N and LiAlO[sub 2] were the ceramic materials with the best chemical stability in the presence of the molten alkali carbonate mixtures. Wetting studies were used to determine the desired microstructures for salt containment. This was particularly true in the case of A1N. It was not possible to obtain or fabricate dense samples of LiAlO[sub 2] for use in wetting studies; however, it is known that LiAlO[sub 2] is wet by the salt compositions of interest The capillary force equation (equation 2) was used to estimate, the maximum pressure differential that the membrane could sustain without loss of the salt. |
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| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 01/01/1992. "doe/mc/26038-93/c0105" " conf-920951--21" "DE93002617" US Department of Energy contractors review meeting on gasification and gas stream cleanup systems, Morgantown, WV (United States), 15-17 Sep 1992. Quinn, R.; Herman, F.L.; Minford, E. |
| Physical Description: | Pages: (10 p) : digital, PDF file. |