Combination of membrane separation and gas condensation for advanced natural gas conditioning
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Type
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Journal
Article
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Author
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Katja
Neubauer
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Author
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Radostina
Dragomirova
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Author
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Marion
Stöhr
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Author
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Raymond
Mothes
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Author
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Udo
Lubenau
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Author
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Dietmar
Paschek
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Author
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Sebastian
Wohlrab
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URL
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Volume
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453
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Pages
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100-107
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Publication
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Journal
of Membrane Science
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Date
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March
1, 2014
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Abstract
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Combining membrane separation and gas
condensation reveal an advanced method for the separation of alkanes. First,
the applicability of MFI membranes for alkane separation is demonstrated
using realistic adsorption isotherms computed by configurational biased Monte
Carlo (CBM) simulations. Dew point curves of mixtures comprising different
ratios of n-butane (C4) and methane (C1) were then calculated according to
the thermodynamic methods of Soave–Redlich–Kwong (SRK) and Peng Robinson
(PR).
Isothermal phase boundaries in dependence on the composition of the gas mixture were derived and process parameters under which condensation of the alkane mixture occurs were predetermined. Experimentally, the separation performance of MFI membranes was recorded during separation of n-butane from methane. It was found that liquefied n-butane in the feed and a further liquefaction in the permeate enhance the separation selectivity of MFI zeolite membranes under sweeping conditions tremendously. At the dew point of the feed mixture a sudden rise of the separation factor α was observed. At a temperature of 258 K a mixture with χ C 4 =0.5 can be separated with a separation factor α C 4 / C 1 =174 due to liquefaction. Experiments without sweeping show a similar behaviour. When forming a two phase mixture in the feed an increase in overall condensation efficiency η C 4 is detected in the permeate. At 258 K and pfeed=2 bar and ppermeate=1 bar 29.6% liquefied n-butane was isolated in the permeate from a mixture comprising χ C 4 =0.5. |
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