Gas permeation properties of polyamide membrane prepared by interfacial polymerization |
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Authors: | S Sridhar B Smitha Satyajai Mayor B Prathab T M Aminabhavi |
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Affiliation: | (1) Membrane Separations Division, Center of Excellence in Polymer Science, Karnatak University, Dharwad, 580 003, India;(2) Membrane Separations Group, Indian Institute of Chemical Technology, Hyderabad, 500 007, India;(3) Permionics Membranes Pvt. Ltd., Vadodara, 390 016, India |
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Abstract: | Interfacial polymerization technique has been widely employed to prepare reverse osmosis (RO) and nanofiltration (NF) membranes.
The present study explores the possibility of preparing a polyamide membrane by interfacial polymerization and its utilization
for the separation of CO2 and H2S from CH4. A novel ultraporous substrate of polysulfone (PSF) was prepared by phase inversion technique from a solution containing
18% PSF and 4% propionic acid in dimethyl formamide (DMF) solvent. Thin film composite (TFC) polyamide membrane was synthesized
on PSF substrate from the reaction between meta-phenylene diamine in an aqueous media and isophthaloyl chloride in hexane. The membrane prepared was characterized by Fourier
transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and scanning electron
microscopy (SEM) to study intermolecular interactions, crystallinity, thermal stability and surface morphology, respectively.
Gas permeabilities of pure CO2, H2S, CH4, O2, and N2 gases were measured using the indigenously built permeation cell incorporated into a high-pressure gas separation manifold.
At the feed pressure of 1 MPa, the membrane exhibited permeances of 15.2 GPU for CO2 and 51.6 GPU for H2S with selectivities of 14.4 and 49.1 for CO2/CH4 and H2S/CH4 systems, respectively. The observed N2 permeance of 0.95 GPU was close to that of CH4. The corresponding O2 permeance was 5.13 GPU with a reasonably high O2/N2 selectivity of 5.4. The effect of feed pressure on polyamide membrane performance was examined. Further, molecular dynamics
(MD) simulations were employed to compute the cohesive energy density (CED), solubility parameter (δ) and sorption of CO2, H2S, CH4, O2, and N2 gases in polyamide membrane to corroborate theoretical study with experimentally determined gas transport properties. |
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