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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

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Front Chem Sci Eng    2011, Vol. 5 Issue (4) : 500-513    https://doi.org/10.1007/s11705-011-1108-x
RESEARCH ARTICLE
CO2 and H2 selectivity properties of PDMS/PSf membrane prepared at different conditions
S. A. A. MANSOORI, M. PAKIZEH(), A. JOMEKIAN
Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
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Abstract

The effects of different solvent/water coagulation mediums, different coagulation bath temperatures (CBT) and different coagulants on the performance, morphology and thermal stability of polysulfone membranes were investigated. The CO2/CH4, H2/CH4 and H2/N2 separation performance of the membranes were studied by gas permeation. Changing the N,N-dimethyl acetamide (DMAc)/water coagulation medium ratio from pure water to 90/10 vol%, resulted in a complete disappearance of the macrovoids throughout the polysulfone (PSf) polymeric matrix. The PSf membrane prepared in a CBT of 25°C showed the best gas separation performance with ideal selectivities of 46.29, 39.81 and 51.02 for H2/CH4, CO2/CH4 and H2/N2 respectively, and permeances of 25 and 21.5 GPU for H2 and CO2 at 25°C and 10 bar respectively. By increasing the amount of solvent in the gelation bath, the selectivities of H2/CH4, CO2/CH4 and H2/N2 were dramatically reduced from 46.29, 39.81 and 51.02 to 16.08, 20.2 and 18.5 respectively at 25°C and 10 bar. Reducing the CBT from 80°C to 5°C led to a complete elimination of macrovoids. Using methanol as a coagulant resulted in a less selective membrane compared with membranes from ethanol and water coagulants. The H2 and CO2 permeances were respectively about 3 and 9 times more than those for ethanol and water coagulants. Coated membranes were heated at different temperatures to investigate the suppression of undesirable CO2 plasticization. The membranes were stabilized against CO2 plasticization by a heat-treatment process.
Keywords gas separation      PDMS/PSf membrane      synthesis parameters      CO2 selectivity     
Corresponding Author(s): PAKIZEH M.,Email:pakizeh@um.ac.ir   
Issue Date: 05 December 2011
 Cite this article:   
S. A. A. MANSOORI,M. PAKIZEH,A. JOMEKIAN. CO2 and H2 selectivity properties of PDMS/PSf membrane prepared at different conditions[J]. Front Chem Sci Eng, 2011, 5(4): 500-513.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-011-1108-x
https://academic.hep.com.cn/fcse/EN/Y2011/V5/I4/500
Fig.1  Schematic representation of the gas permeation module
Fig.2  Schematic illustration of the constant pressure testing system
Fig.3  SEM photographs of the effect of the solvent concentration in the gelation bath on membrane structure. Gelation bath DMAc: deionized water ratios (a) 0 ∶ 100 vol-%; (b) 40 ∶ 60 vol-%; (c) 80 ∶ 20 vol-%; (d) 90 ∶ 10 vol-%
Fig.4  SEM photographs of the effect of the solvent concentration in the gelation bath on membrane structure. Gelation bath DMAc: deionized water ratios (a) 0 ∶ 100 vol-%; (b) 40 ∶ 60 vol-%; (c) 80 ∶ 20 vol-%; (d) 90 ∶ 10 vol (with magnification 10000)
Fig.5  SEM photographs of a PSf membrane surface. Gelation bath: (a) pure deionized water; (b) 80 vol-% DMAc, 20 vol-% deionized water
Gelation bath composition: vol-% DMAC: vol-% deionized waterPermeance/ GPU b)Selectivity
H2CH4CO2H2/CH4CO2/CH4
0 ∶ 100250.5421.546.2939.81
40 ∶ 6012.10.3610.2533.6128.47
80 ∶ 206.20.275.0122.9618.88
90 ∶ 103.70.232.916.0812.6
Tab.1  Gas permeance and selectivity through PDMS/PSf composite membranes (with different gelation bath compositions)
Gelation bath composition vol% DMAC: vol% deionized waterPermeance/ GPU b)Selectivity of H2/N2
H2N2
0 ∶ 100250.4951.02
40 ∶ 6012.10.3435.58
80 ∶ 206.20.2524.8
90 ∶ 103.70.2018.5
Tab.2  Gas permeance and selectivity through PDMS/PSf composite membranes (with different gelation bath compositions)
Fig.6  SEM photographs of the effect of the coagulation bath temperature on membrane structure. Gelation temperature (a) 5°C; (b) 25°C; (c) 50°C; (d) 80°C
CBT /°CPermeance/GPU b)Selectivity of H2/N2
H2N2
520.50.5934.74
25250.4951.02
5022.80.9723.5
80211.119.09
Tab.3  Gas permeance and selectivity of PDMS/PSf composite membrane using deionized water as coagulant (at different CBT)
CBT /°CPermeance/GPU b)Selectivity
H2CH4CO2H2/CH4CO2/CH4
520.50.6315.532.5424.6
25250.5421.546.2939.81
5022.81.118.520.7216.81
80211.61613.1210
Tab.4  Gas permeance and selectivity of PDMS/PSf composite membrane using deionized water as coagulant (at different CBT)
Fig.7  SEM photographs of the effect of the coagulant on the polysulfone membrane structure made by dry/wet phase inversion using forced convective evaporation. (a) deionized water; (b) ethanol; (c) methanol
Fig.8  SEM photographs of the effect of the coagulant on the polysulfone membrane structure made by dry/wet phase inversion using forced convective evaporation. (a) deionized water; (b) ethanol; (c) methanol with magmification 10000
Fig.9  SEM photographs of the top structure of asymmetric polysulfone membrane sample at a magnification of 100000. Coagulant: (a) methanol; (b) ethanol; (c) water
Fig.10  SEM photographs of the surface of PSF membranes made with different coagulants. (a) Water bath; (b) Ethanol bath; (c) Methanol bath
CoagulantPermeance /GPU b)Selectivity
H2CH4CO2H2/CH4CO2/CH4
Deionized water250.5421.546.2939.81
Ethanol712.0562.3534.6330.41
Methanol217.58.09189.226.8823.38
Tab.5  Gas permeance and selectivity through PDMS/PSf composite membranes (with different coagulants)
CoagulantPermeance /GPU bSelectivity of H2/N2
H2N2
Deionized water250.4951.02
Ethanol711.9736.04
Methanol217.57.9427.39
Tab.6  Gas permeance and selectivity through PDMS/PSf composite membranes (with different coagulants)
Membrane typePermeance or permeabilitySelectivityRef.
H2CH4N2CO2H2/CH4,H2/N2,CO2/CH4
Silicone-coated PSf16a)0.47a)0.37a)6.8534.04,43.24,14.57[11]
PDMS/PSf62.94b)3.09b)2.87b)-20.4,22-[12]
PSf/Silica (85/15 vol-%)22.7a)0.62a)0.67a)12.9a)36.61,33.88,20.8[13]
PBN/PI (15 wt-%)14.31a)1.78a)--8.04--[14]
Present work25b)0.54b)0.49b)21.546.29,51.02,39.81
Tab.7  A comparison between the present work and other studies
Fig.11  TGA curves showing the effect of different coagulation baths on the thermal degradation of PSF membranes
Fig.12  CO permeation rate as a function of CO feed pressure at different temperatures
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