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Mohammad Soltanieh,Mahdi Pourafshari Chenar,Houman Savoji,Takeshi Matsuura,Shahram Tabe 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
Impurities such as hydrogen sulfide, water vapor and heavy hydrocarbons in natural gas have considerable effects on the membrane performance. Small amounts of condensable and polymer soluble components in the feed gas cause swelling or plasticization of glassy membranes, leading to a reduction in membrane selectivity. In the present research the influence of ethane was investigated on the permeance and selectivity of two commercially available hollow fiber membranes, namely Cardo-type polyimide and PPO hollow fibers for CO2/CH4 separations. It was concluded that the gas mixture permeation rate was increased in the presence of C2H6. However, the CO2/CH4 separation factors remained almost the same in the presence and absence of the C2H6.
Hesamoddin Rabiee,Mohammad Soltanieh,Shadi Meshkat Alsadat,Seyyed Abbas Mousavi,Ali Ghadimi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Zeolite SAPO-34 was used for fabrication of mixed matrix membranes (MMMs) to improve the CO2/CH4/N2 gas separation performance of the neat Pebax1074 membrane. Permeability and selectivity of theMMMs were studied at different temperatures of 25–65 8C and pressures of 4–24 bars. Also sorption ofdifferent gases in MMMs was measured at 35 8C and different pressures, which showed enhancedsolubility coefficients. Moreover, thermal, morphological and mechanical properties of MMMs werecharacterized by differential scanning calorimetry (DSC), scanning electron microscope (SEM) andtensile analysis. The results showed excellent improvement in CO2/CH4 selectivity (about 70%) andCO2/N2 selectivity (about 15%) at 20 wt% SAPO-34 loading
Mahdi Pourafshari Chenar,Mohammad Soltanieh,Houman Savoji,Takeshi Matsuura,Shahram Tabe 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.3
The performance of commercially available poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) and Cardotype polyimide (PI) hollow fiber membranes was investigated in removing hydrogen sulfide from methane in a series of bench-scale experiments. It was observed that in the concentration range of hydrogen sulfide in methane from 101 to 401 ppm, the methane permeability decreased in the presence of hydrogen sulfide for Cardo-type polyimide hollow fiber membranes, whereas the PPO membrane performance was not affected. The separation coefficients of hydrogen sulfide/methane were 6 and 4 for PI and PPO membranes, respectively. Effects of temperature on the performance of PI and PPO membranes were investigated. It was observed that the permeabilities of both components of the mixture increased by increasing temperature, whereas the selectivities remained constant.