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Plasticization effect on performance of polyphenylene oxide hollow fiber membrane at high concentrations of hydrogen sulfide

Savoji, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. Natural gas contains several impurities, e.g., CO 2 and H 2S, which have undesirable effects on the performance of the glassy polymeric membranes. The plasticization effect of H 2S at high concentrations on the gas separation performance of polyphenylene oxide hollow fiber membrane has been studied at different compositions of H 2S and feed pressures. The existence of high concentrations of H 2S in CH 4 feed mixture, which is present in many natural gas sources in Iran, enhances plasticization. For a H 2S/CH 4 mixture containing 5008 ppm H 2S at ≈ 75 psig, the H 2S permeance reduces by > 45% from its initial value. H 2S acts as a plasticizer in H 2S/CH 4 membrane separation at elevated pressures. The polymer matrix swells upon sorption of H 2S, which accelerates the permeation of CH 4 resulting in reduction of the polymer membrane selectivity. The plasticization effect accelerates the permeation of methane and therefore more methane loss through the membrane. This is an abstract of a paper presented at the 7th European Congress of Chemical Engineering-7 and 19th International Congress of Chemical and Process Engineering CHISA (Prague, Czech Republic 8/28/2010-9/1/2010)
  4. Keywords:
  5. Gas separation ; Hollow fiber polymeric membrane ; Hydrogen sulfide ; Permeability ; Plasticization
  6. Source: 19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congress of Chemical Engineering, ECCE-7, 28 August 2010 through 1 September 2010 ; 2010