Fabrication and characterization of PEI/PVP‐based carbon hollow fiber membranes for CO₂/CH₄ and CO₂/N₂ separation

Abstract

Carbon hollow fiber membranes derived from polymer blend of polyetherimide and polyvinylpyrrolidone (PVP) were extensively prepared through stabilization under air atmosphere followed by carbonization under N2 atmosphere. The effects of the PVP compositions on the thermal behavior, structure, and gas permeation properties were investigated thoroughly by means of differential scanning calorimetry, thermogravimetric analysis, X‐ray diffraction, and pure gas permeation apparatus. The experimental results indicate that the transport mechanism of small gas molecules of N2, CO2, and CH4 is dominated by the molecular sieving effect. The gas permeation properties of the prepared carbon membranes have a strong dependency on PVP composition. The carbon membranes prepared from polymer blends with 6 wt % PVP demonstrated the highest CO2/CH4 and CO2/N2 selectivities of 55.33 and 41.50, respectively. © 2011 American Institute of Chemical Engineers AIChE J, 58: 3167–3175, 2012

The Influence of Carbonization Temperature on the Development of Carbon Membrane With Superior Co2/Ch4 Separation Performance

“…It was found that the formed polymer chains had increased the packing density of the membranes, and some of the pores had become narrow due to the densification of carbon structure. Similar findings had also been reported elsewhere [16]. As the final carbonization temperature was increased, the gas passed through the membrane structure according to their kinetic diameter.…”

“…This pattern is in agreement with the fact that at high temperature, carbonized membranes will possess a microporous structure that is capable to recognize different kinetic diameter of gases, which then will increase the selectivity. Similar findings were also reported by Salleh and Ismail [16]. The increasing trend suggested that the micropores formation and the carbon structure of the carbon membrane became rigid and compact; and some of the pores might change into closed pores during the carbonization process.…”

Hyperaging Tuning of a Carbon Molecular‐Sieve Hollow Fiber Membrane with Extraordinary Gas‐Separation Performance and Stability

“…Molecularly selective CMS membranes enable difficult gas separations and have good chemical, thermal, and mechanical properties . Such membranes are useful for natural gas, air, and petrochemical applications . Optimizing the permeability and selectivity of CMS membranes by tailoring precursors and/or optimizing pyrolysis conditions are accepted approaches .…”

Hyperaging Tuning of a Carbon Molecular‐Sieve Hollow Fiber Membrane with Extraordinary Gas‐Separation Performance and Stability

“…[21] TheC MS pore morphology includes micropores (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) between the stacks of sheets and smaller ultramicropores (< 7 )within the individual sheets (Supporting Information, Figure S1). [21] TheC MS pore morphology includes micropores (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) between the stacks of sheets and smaller ultramicropores (< 7 )within the individual sheets (Supporting Information, Figure S1).…”