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RISS 인기검색어
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- 저자 : Saeed Laki (검색결과 3 건)
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Ahmad Arabi Shamsabadi,Masoud Bahrami Babaheidari,Ali Kargari,Saeed Laki,Hadi Ajami 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
In preparation of polymeric gas separation membranes by phase inversion method, polymer concentration is one of the most important variables which can change membrane morphology and behavior. In this research, critical concentration of the polyetherimide (PEI) solutions in N-methyl-2-pyrrolidone (NMP) as a solvent was determined by viscometric method. The influence of temperature on critical concentration was studied. Three asymmetric PDMS/PEI membranes with different concentrations of PEI were prepared and characterized for H2/CH4 separation. The results showed that the membranes with higher concentrations than critical concentration were more suitable for gas separation. In addition, the viscosity data were fitted by appropriate equations and the densities were satisfactorily correlated by a simple first-order polynomial with respect to temperature and the PEI mass fraction. The prepared membrane showed the selectivity of 26 for H2/CH4 separation at 1 bar and 25 8C for pure gas and 24.8 for mixed gas. The influence of the pressure on the H2 and CH4 permeance and the selectivity for a mixed binary gas showed that the permeance of both gases declined by pressure enhancement and the selectivity increased.
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Shahab Saedi,Sayed S. Madaeni,Keyumars Hassanzadeh,Ahmad Arabi Shamsabadi,Saeed Laki 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In the present study, asymmetric gas separation membranes of polyethersulfone (PES) and polyethersulfone/polyurethane (PU) were prepared with different blend compositions. The prepared membranes were investigated for the separation of carbon dioxide from methane. The effect of PU on the microstructure and d-spacing of the membranes was studied by X-ray diffraction analysis and the miscibility of PES and PU was investigated using Differential Scanning Calorimetry (DSC). The thermal properties of PES and PES/PU were compared using Thermal Gravimetric Analysis (TGA). The effect of PES/PU blend composition on the morphology and porosity of the membrane was investigated by Scanning Electron Microscopy (SEM) and porosity experiments. Density Functional Theory (DFT) calculations were used to investigate the relative affinity of CO2, CH4 and H2O for PES and PU. Moreover, the effect of PU on the casting solution viscosity, gas sorption and mechanical properties of the PES membrane was investigated. For comparing gas separation performance of PES and PES/PU membranes, pure and mixed gas experiments were carried out. The obtained results indicated that the presence of PU in the casting solution increases the d-spacing and fractional free volume, and decreases the membrane porosity; Tg and thermal resistance, membrane gas sorption as well as CO2 induced plasticization by decreasing Langmuir capacity, and also increases strength at yield and elongation at yield of PES membrane. The presence of PU decreases the CO2 permeance and enhances the CO2/CH4 selectivity and plasticization pressure of the PES membrane. Furthermore, the presence of the PU changes the membrane behavior against the feed pressure, feed temperature and feed composition in the mixed gas experiments.
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Separation of hydrogen from methane by asymmetric PEI membranes
Ahmad Arabi Shamsabadi,Ali Kargari,Masoud Bahrami Babaheidari,Saeed Laki 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Hydrogen is anticipated to play an inevitable role as one of the promising sources of energy in the future. Recovery of hydrogen from flare gases is an economical and environmental policy of Marun Petrochemical Company. The asymmetric polyetherimide (PEI) membrane was synthesized and sorption and permeation of CH4 and H2 were studied. The influence of pressure and temperature as operating variables were investigated. Results showed that permeance was enhanced by temperature. The pressure increase caused a decline in H2 permeance, whereas CH4 permeance increased due to the Flory–Huggins sorption mechanism and ideal H2/CH4 selectivity reduction. The effect of different nonsolvents as coagulants of the phase inversion technique in membrane morphology and behavior were explained by precipitation time. Water as a non-solvent makes membrane structures denser than others,while isopropanol leads to a porous sponge-like morphology. Lower coagulation bath temperature makes the membrane denser. Finally, a selectivity of 27.8 was achieved for the separation of H2 from CH4.
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