Effects of 60Co-Irradiation on Gas Permeation Properties of Polyimide Membranes

2014 ◽  
Vol 912-914 ◽  
pp. 123-126
Author(s):  
Yu Hua Qiao ◽  
Huai Min Miao ◽  
Yong Biao Xu ◽  
Wei Jiang ◽  
Yan Hong Zheng ◽  
...  
Keyword(s):  
Gas Separation ◽  
Radiation Effects ◽  
Gas Permeability ◽  
Gas Permeation ◽  
Ideal Selectivity ◽  
Tetracarboxylic Dianhydride ◽  
Permeation Properties ◽  
The Ideal ◽  
Polyimide Membranes

Radiation effects on polyimide (PI) membranes were studied with different irradiation doses by60Co. The PI membrane were synthesized from 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane (Bis-AP-AF) with 3,3',4,4'-Benzophenone tetracarboxylic dianhydride (BTDA). The single gas permeability of He, H2, CO2, O2, N2and CH4were measured and compared in order to determine the effect of the the irradiation doses on the gas separation properties. The results showed that the ideal selectivity of He/CH4, H2/CH4, CO2/CH4and H2/N2of the irradiation PI membrane can be significantly improved by irradiation of60Co source. The optimum irradiation doses were 50 kGy. The highest ideal selectivity of He/CH4, H2/CH4, CO2/CH4and H2/N2is 3635.86, 2287.57, 282.00 and 205.29, respectively. In other word, the ideal selectivity of He/CH4, H2/CH4, CO2/CH4and H2/N2of the irradiation PI membrane with 50 kGy irradiation doses is 2.27, 2.11, 1.89 and 1.08 times higher than that of the PI membranes without irradiation.

Gas Separation Properties of Polyimide Membranes Based on 2,2-Bis(3-amino-4-hydroxyphenyl)hexafluoropropane

2012 ◽  
Vol 524-527 ◽  
pp. 1241-1244 ◽  
Author(s):  
Yan Hong Zheng ◽  
Yu Zhai ◽  
Jian Mei Guo ◽  
Hong Yan Yu ◽  
Lian Cai Wang ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Permeability ◽  
Separation Property ◽  
Polycondensation Reaction ◽  
Polyamic Acid ◽  
Ideal Selectivity ◽  
Thermal Imidization ◽  
Polyimide Membranes

A series of polyimides (PIs) by thermal imidization of polyamic acid (PAA) were prepared in order to investigate the gas separation property. The single gas permeability of He, H2, CO2, O2, N2 and CH4 were measured and compared in order to determine the effect of the reaction content and thermal imidization temperature on the gas separation properties. The results showed that the higher the thermal imidization temperature is, the more beneficial for the gas separation properties of the PI membranes. The optimum polycondensation reaction content on preparing PI was 25 wt%. The highest ideal selectivity of He/CH4, H2/CH4, CO2/CH4 and H2/N2 is 2814.88, 1652.38, 216.63 and 191.58, respectively.

Optical, thermal and gas separation properties of acetate-containing copoly(ether-imide)s based on 6FDA and fluorenyl diamines

2019 ◽  
Vol 31 (9-10) ◽  
pp. 1101-1111 ◽  
Author(s):  
Yunhua Lu ◽  
Jican Hao ◽  
Guoyong Xiao ◽  
Lin Li ◽  
Zhizhi Hu ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Permeation ◽  
Light Transmittance ◽  
Step Method ◽  
Ether Linkage ◽  
Nuclear Magnetic Resonance Spectrometer ◽  
Thermogravimetric Analyzer ◽  
Structures And Properties ◽  
Infrared Spectrometer ◽  
The Ideal

The diamine, 9,9-bis[4-(4-amino-3-hydroxylphenoxy)phenyl]fluorene (BAHPPF) was synthesized by the modified two-step method. Then, a series of acetate-containing copoly(ether-imide)s were prepared by the copolymerization of BAHPPF, 9,9-bis(4-aminophenyl)fluorene (BAF) and 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) followed by chemical imidization. The structures and properties of the BAHPPF and copoly(ether-imide)s were characterized by nuclear magnetic resonance spectrometer (NMR), Fourier transform infrared spectrometer (FTIR), X-ray diffractometer (XRD), differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA), ultraviolet-visible spectrophotometer (UV-VIS), and tensile testing. Single gas permeation performances of these copoly(ether-imide)s were also studied for five representative gases of interest including H2, O2, N2, CO2, and CH4. The experimental results showed that the copoly(ether-imide)s showed excellent optical properties with high light transmittance above 80.2% at 450 nm. The glass transition temperature of these copolymers were higher than 333°C. Their tensile strength and Young’s module also increased, and the elongation decreased with the decrease of BAHPPF. High gas permeabilities of copoly(ether-imide)s were obtained, and the ideal selectivity of CO2/CH4 was improved due to the introduction of acetate group and flexible ether linkage. These copoly(ether-imide)s could be applied to the field of optics and gas separation.

scholarly journals Evaluation of the Properties, Gas Permeability, and Selectivity of Mixed Matrix Membrane Based on Polysulfone Polymer Matrix Incorporated with KIT-6 Silica

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1732 ◽  
Author(s):  
Sie Hao Ding ◽  
Tiffany Yit Siew Ng ◽  
Thiam Leng Chew ◽  
Pei Ching Oh ◽  
Abdul Latif Ahmad ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Polymer Matrix ◽  
Pressure Difference ◽  
Gas Permeability ◽  
Gas Permeation ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Carbon Dioxide Co2 ◽  
The Ideal

Mixed matrix membranes (MMMs) separation is a promising technology for gas permeation and separation involving carbon dioxide (CO2). However, finding a suitable type of filler for the formation of defect-free MMMs with enhancement in gas permeability remains a challenge. Current study focuses on synthesis of KIT-6 silica and followed by the incorporation of KIT-6 silica as filler into polysulfone (PSF) polymer matrix to fabricate MMMs, with filler loadings of 0–8 wt %. The effect of KIT-6 incorporation on the properties of the fabricated MMMs was evaluated via different characterization techniques. The MMMs were investigated for gas permeability and selectivity with pressure difference of 5 bar at 25 °C. KIT-6 with typical rock-like morphology was synthesized. Incorporation of 2 wt % of KIT-6 into PSF matrix produced MMMs with no void. When KIT-6 loadings in the MMMs were increased from 0 to 2 wt %, the CO2 permeability increased by ~48%, whereas the ideal CO2/CH4 selectivity remained almost constant. However, when the KIT-6 loading in PSF polymer matrix was more than 2 wt %, the formation of voids in the MMMs increased the CO2 permeability but sacrificed the ideal CO2/CH4 selectivity. In current study, KIT-6 was found to be potential filler for PSF matrix under controlled KIT-6 loading for gas permeation.

Gas Permeation Properties of Asymmetric Polyimide Membranes with Partially Carbonized Skin Layer

2004 ◽  
Vol 37 (18) ◽  
pp. 6892-6897 ◽  
Author(s):  
M. Iwase ◽  
A. Sannomiya ◽  
S. Nagaoka ◽  
Y. Suzuki ◽  
M. Iwaki ◽  
...  
Keyword(s):  
Skin Layer ◽  
Gas Permeation ◽  
Permeation Properties ◽  
Polyimide Membranes

scholarly journals The CO2/CH4 Separation Potential of ZIF-8/Polysulfone Mixed Matrix Membranes at Elevated Particle Loading for Biogas Upgradation Process

2020 ◽  
Vol 10 (2) ◽  
pp. 213-219
Author(s):  
Putu Doddy Sutrisna ◽  
Ronaldo Pangestu Hadi ◽  
Jonathan Siswanto ◽  
Giovanni J Prabowo
Keyword(s):  
Renewable Energy ◽  
Gas Separation ◽  
Gas Permeability ◽  
Gas Permeation ◽  
Degree Of Crystallinity ◽  
Polymeric Membrane ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Particle Loading ◽  
Inorganic Particles

Biogas is a renewable energy that has been explored widely in Indonesia to substitute non-renewable energy. However, the presence of certain gas, such as carbon dioxide (CO2), can decrease the calorific value and generate greenhouse gas. Hence, the separation of CO2 from methane (CH4) occurs as a crucial step to improve the utilization of biogas. The separation of CH4/CO2 can be conducted using a polymeric membrane that needs no chemical, hence considered as an environmentally friendly technique. However, the utilization of polymeric membrane in gas separation processes is hampered by the trade-off between gas throughput and selectivity. To solve this problem, the incorporation of inorganic particles, such as Zeolitic Imidazolate Framework-8 (ZIF-8) particles, into the polymer matrix to improve the gas separation performance of the membrane has been conducted recently. In this research, ZIF-8 has been incorporated into Polysulfone matrix to form ZIF-8/Polysulfone-based membrane by simple blending and phase inversion techniques in flat sheet configuration. The pure gas permeation tests showed an increase in gas permeability (26 Barrer compared to 17 Barrer) after the inclusion of ZIF-8 particles with a slight decrease in CO2/CH4selectivity for particle loading more than 15wt. %. Therefore, the membrane with 15wt. % of particles showed the best performance in terms of gas selectivity. This result was due to the aggregation of ZIF-8 particles at particle loading higher than 15wt. %. Chemical analysis indicated an interaction between filler and polymer, and there were increases in the degree of crystallinity after the incorporation of ZIF-8.

Synthesis and gas separation performance of intrinsically microporous polyimides derived from sterically hindered binaphthalenetetracarboxylic dianhydride

2020 ◽  
Vol 11 (25) ◽  
pp. 4172-4179
Author(s):  
Xiaofan Hu ◽  
Hongliang Mu ◽  
Jie Miao ◽  
Yao Lu ◽  
Xianwei Wang ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Permeability ◽  
Separation Performance ◽  
Sterically Hindered ◽  
Tetracarboxylic Dianhydride ◽  
Gas Separation Performance

Intrinsically microporous polyimides with high gas permeability and favorable selectivity were prepared from a bulky, rigid, and sterically hindered dianhydride, 3,3′-di-t-butyl-2,2′-dimethoxy-[1,1′-binaphthalene]-6,6′,7,7′,-tetracarboxylic dianhydride.

Gas Permeation Properties of Poly(N-Vinylpyrrolidone)/ 3-Aminopropyltriethoxysilane Hybrid Membranes

2007 ◽  
Vol 124-126 ◽  
pp. 683-686 ◽  
Author(s):  
Kyoung Mi Jang ◽  
Jun Seok Kim ◽  
Sung Koo Lee ◽  
Hyun Joon Kim
Keyword(s):  
Gas Permeability ◽  
Diffusion Mechanism ◽  
Sol Gel ◽  
Gas Permeation ◽  
Hybrid Membranes ◽  
Positive Dependence ◽  
Chain Flexibility ◽  
Permeability Coefficients ◽  
Increasing Temperature ◽  
Permeation Properties

The organic-inorganic hybrid membranes of poly(N-vinylpyrrolidone) (PVP) and 3- aminopropyltriethoxysilane (APTEOS) were prepared by sol-gel process and their permeation properties of N2 and O2 were studied. The gas permeability coefficients of N2 and O2 are increased with increasing temperature in a range of 30-50°C. The positive dependence on temperature and higher ideal separation factor than theoretical Knudsen value indicates that PVP/APTEOS hybrid membranes follow solution-diffusion mechanism, which is applied to nonporous membrane. The permeability coefficients of N2 and O2 are decreased with increasing PVP content, at a given temperature. It can be explained that the stronger interaction between PVP and APTEOS reduces available free volume, although the increasing of PVP content may lead to an enhancement of chain flexibility.

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