Improved Hydrogen Separation Using Hybrid Membrane Composed of Nanodiamonds and P84 Copolyimide

Membrane gas separation is a prospective technology for hydrogen separation from various refinery and petrochemical process streams. To improve efficiency of gas separation, a novel hybrid membrane consisting of nanodiamonds and P84 copolyimide is developed. The particularities of the hybrid membrane structure, physicochemical, and gas transport properties were studied by comparison with that of pure P84 membrane. The gas permeability of H2, CO2, and CH4 through the hybrid membrane is lower than through the unmodified membrane, whereas ideal selectivity in separation of H2/CO2, H2/CH4, and CO2/CH4 gas pairs is higher for the hybrid membrane. Correlation analysis of diffusion and solubility coefficients confirms the reliability of the gas permeability results. The position of P84/ND membrane is among the most selective membranes on the Robeson diagram for H2/CH4 gas pair.

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Synthesis and Formation of Gas Separation Membranes Based on Polyalkylenesiloxanes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.816.233 ◽

2019 ◽

Vol 816 ◽

pp. 233-237

Author(s):

Ilya L. Borisov ◽

N.V. Ushakov ◽

E.A. Grushevenko ◽

E.S. Finkel’stein ◽

V.V. Volkov

Keyword(s):

Gas Separation ◽

Separation Process ◽

Membrane Gas Separation ◽

Gas Separation Membrane ◽

Separation Membranes ◽

Gas Separation Membranes ◽

Gas Transport Properties ◽

Separation Membrane ◽

Transport Component ◽

The Ideal

The membrane gas separation is currently a competitive separation process. The heart of the membrane gas separation process is the membrane, more precisely the material from which it is made. The search for a selective material to develop a gas separation membrane is an important task presently. Membrane materials with advantageous impact of sorption transport component is a good material for the selective fractionating С1-С4 hydrocarbons with obtaining methane fraction and C3+ fraction. Such materials are polyalkylenesiloxanes. In this work, the optimal concentration of a curing agent (tetraethoxysilane) was defined (5%). Such concentration is necessary for obtaining constant membrane film with high gas transport properties: the permeability coefficient for n-butane is 7400; the ideal selectivity of n-butane/methane is 25.5.

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Studies in gas permeability and membrane gas separation in the Soviet Union

Journal of Membrane Science ◽

10.1016/0376-7388(91)80092-k ◽

1991 ◽

Vol 64 (3) ◽

pp. 191-228 ◽

Cited By ~ 33

Author(s):

Yu.P. Yampol'skii ◽

V.V. Volkov

Keyword(s):

Soviet Union ◽

Gas Separation ◽

Gas Permeability ◽

Membrane Gas Separation ◽

The Soviet Union

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.912-914.123 ◽

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.

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Superglassy Polymers to Treat Natural Gas by Hybrid Membrane/Amine Processes: Can Fillers Help?

Membranes ◽

10.3390/membranes10120413 ◽

2020 ◽

Vol 10 (12) ◽

pp. 413

Author(s):

Ahmed W. Ameen ◽

Peter M. Budd ◽

Patricia Gorgojo

Keyword(s):

Natural Gas ◽

Gas Separation ◽

Gas Permeability ◽

Hybrid Membrane ◽

Gas Content ◽

Superior Performance ◽

Mixed Matrix Membranes ◽

Acid Gas ◽

Gas Removal ◽

Over Time

Superglassy polymers have emerged as potential membrane materials for several gas separation applications, including acid gas removal from natural gas. Despite the superior performance shown at laboratory scale, their use at industrial scale is hampered by their large drop in gas permeability over time due to physical aging. Several strategies are proposed in the literature to prevent loss of performance, the incorporation of fillers being a successful approach. In this work, we provide a comprehensive economic study on the application of superglassy membranes in a hybrid membrane/amine process for natural gas sweetening. The hybrid process is compared with the more traditional stand-alone amine-absorption technique for a range of membrane gas separation properties (CO2 permeance and CO2/CH4 selectivity), and recommendations for long-term membrane performance are made. These recommendations can drive future research on producing mixed matrix membranes (MMMs) of superglassy polymers with anti-aging properties (i.e., target permeance and selectivity is maintained over time), as thin film nanocomposite membranes (TFNs). For the selected natural gas composition of 28% of acid gas content (8% CO2 and 20% H2S), we have found that a CO2 permeance of 200 GPU and a CO2/CH4 selectivity of 16 is an optimal target.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.524-527.1241 ◽

2012 ◽

Vol 524-527 ◽

pp. 1241-1244 ◽

Cited By ~ 1

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.

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A SEM/TEM examination of a ceramic membrane

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100144802 ◽

1986 ◽

Vol 44 ◽

pp. 682-683

Author(s):

C.E. Voegele-Kliewer ◽

A.D. McMaster ◽

G.W. Dirks

Keyword(s):

Electron Microscopy ◽

Gas Separation ◽

Ceramic Membrane ◽

Hydrogen Iodide ◽

Separation Processes ◽

Corning Glass ◽

Gas Transport Properties ◽

Porous Microstructure ◽

Microscopy Techniques ◽

The Relationship

Materials other than polymers, e.g. ceramic silicates, are currently being investigated for gas separation processes. The permeation characteristics of one such material, Vycor (Corning Glass #1370), have been reported for the separation of hydrogen from hydrogen iodide. This paper will describe the electron microscopy techniques applied to reveal the porous microstructure of a Vycor membrane. The application of these techniques has led to an increased understanding in the relationship between the substructure and the gas transport properties of this material.

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Effect of new metal–organic framework (zeolitic imidazolate framework [ZIF-12]) in mixed matrix membranes on structure, morphology, and gas separation properties

Journal of Polymer Engineering ◽

10.1515/polyeng-2020-0288 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Mehtap Safak Boroglu ◽

Ismail Boz ◽

Busra Kaya

Keyword(s):

Gas Separation ◽

Gas Permeability ◽

Metal Organic Framework ◽

Thermomechanical Analysis ◽

Variable Pressure ◽

Mixed Matrix Membranes ◽

Mixed Matrix ◽

Sem Images ◽

Zeolitic Imidazolate Framework ◽

Matrix Membranes

Abstract In our study, the synthesis of zeolitic imidazolate framework (ZIF-12) crystals and the preparation of mixed matrix membranes (MMMs) with various ZIF-12 loadings were targeted. The characterization of ZIF-12 and MMMs were carried out by Fourier transform infrared spectroscopy analysis, thermogravimetric analysis, scanning electron microscopy (SEM), and thermomechanical analysis. The performance of MMMs was measured by the ability of binary gas separation. Commercial polyetherimide (PEI-Ultem® 1000) polymer was used as the polymer matrix. The solution casting method was utilized to obtain dense MMMs. In the SEM images of ZIF-12 particles, the particles with a rhombic dodecahedron structure were identified. From SEM images, it was observed that the distribution of ZIF-12 particles in the MMMs was homogeneous and no agglomeration was present. Gas permeability experiments of MMMs were measured for H2, CO2, and CH4 gases at steady state, at 4 bar and 35 °C by constant volume-variable pressure method. PEI/ZIF-12-30 wt% MMM exhibited high permeability and ideal selectivity values for H2/CH4 and CO2/CH4 were P H 2 / CH 4 = 331.41 ${P}_{{\text{H}}_{2}/{\text{CH}}_{4}}=331.41$ and P CO 2 / CH 4 = 53.75 ${P}_{{\text{CO}}_{2}/{\text{CH}}_{4}}=53.75$ gas pair.

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A Molecular Simulation Study of Silica/Polysulfone Mixed Matrix Membrane for Mixed Gas Separation

Polymers ◽

10.3390/polym13132199 ◽

2021 ◽

Vol 13 (13) ◽

pp. 2199

Author(s):

Khadija Asif ◽

Serene Sow Mun Lock ◽

Syed Ali Ammar Taqvi ◽

Norwahyu Jusoh ◽

Chung Loong Yiin ◽

...

Keyword(s):

Transport Properties ◽

Molecular Simulation ◽

Gas Separation ◽

Membrane Separation ◽

Gas Transport ◽

Mixed Matrix ◽

Mixed Gas ◽

Gas Transport Properties ◽

Simulation Results ◽

Mixed Gases

Polysulfone-based mixed matrix membranes (MMMs) incorporated with silica nanoparticles are a new generation material under ongoing research and development for gas separation. However, the attributes of a better-performing MMM cannot be precisely studied under experimental conditions. Thus, it requires an atomistic scale study to elucidate the separation performance of silica/polysulfone MMMs. As most of the research work and empirical models for gas transport properties have been limited to pure gas, a computational framework for molecular simulation is required to study the mixed gas transport properties in silica/polysulfone MMMs to reflect real membrane separation. In this work, Monte Carlo (MC) and molecular dynamics (MD) simulations were employed to study the solubility and diffusivity of CO2/CH4 with varying gas concentrations (i.e., 30% CO2/CH4, 50% CO2/CH4, and 70% CO2/CH4) and silica content (i.e., 15–30 wt.%). The accuracy of the simulated structures was validated with published literature, followed by the study of the gas transport properties at 308.15 K and 1 atm. Simulation results concluded an increase in the free volume with an increasing weight percentage of silica. It was also found that pure gas consistently exhibited higher gas transport properties when compared to mixed gas conditions. The results also showed a competitive gas transport performance for mixed gases, which is more apparent when CO2 increases. In this context, an increment in the permeation was observed for mixed gas with increasing gas concentrations (i.e., 70% CO2/CH4 > 50% CO2/CH4 > 30% CO2/CH4). The diffusivity, solubility, and permeability of the mixed gases were consistently increasing until 25 wt.%, followed by a decrease for 30 wt.% of silica. An empirical model based on a parallel resistance approach was developed by incorporating mathematical formulations for solubility and permeability. The model results were compared with simulation results to quantify the effect of mixed gas transport, which showed an 18% and 15% percentage error for the permeability and solubility, respectively, in comparison to the simulation data. This study provides a basis for future understanding of MMMs using molecular simulations and modeling techniques for mixed gas conditions that demonstrate real membrane separation.

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