scholarly journals Biphenyl-Based Covalent Triazine Framework/Matrimid® Mixed-Matrix Membranes for CO2/CH4 Separation

Membranes ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 795
Author(s):  
Stefanie Bügel ◽  
Quang-Dien Hoang ◽  
Alex Spieß ◽  
Yangyang Sun ◽  
Shanghua Xing ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Filler Material ◽  
Mixed Matrix Membranes ◽  
Filler Materials ◽  
Mixed Matrix ◽  
Mixed Gas ◽  
Biogas Upgrading ◽  
Current Topic ◽  
Covalent Triazine Framework ◽  
Matrix Membranes

Processes, such as biogas upgrading and natural gas sweetening, make CO2/CH4 separation an environmentally relevant and current topic. One way to overcome this separation issue is the application of membranes. An increase in separation efficiency can be achieved by applying mixed-matrix membranes, in which filler materials are introduced into polymer matrices. In this work, we report the covalent triazine framework CTF-biphenyl as filler material in a matrix of the glassy polyimide Matrimid®. MMMs with 8, 16, and 24 wt% of the filler material are applied for CO2/CH4 mixed-gas separation measurements. With a CTF-biphenyl loading of only 16 wt%, the CO2 permeability is more than doubled compared to the pure polymer membrane, while maintaining the high CO2/CH4 selectivity of Matrimid®.

scholarly journals Gas Transport in Mixed Matrix Membranes: Two Methods for Time Lag Determination

Computation ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 28 ◽  
Author(s):  
Alessio Fuoco ◽  
Marcello Monteleone ◽  
Elisa Esposito ◽  
Rosaria Bruno ◽  
Jesús Ferrando-Soria ◽  
...  
Keyword(s):  
Transport Properties ◽  
Gas Transport ◽  
Time Lag ◽  
Effective Diffusion ◽  
Gas Permeation ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Mixed Gas ◽  
Fitting Procedure ◽  
Matrix Membranes

The most widely used method to measure the transport properties of dense polymeric membranes is the time lag method in a constant volume/pressure increase instrument. Although simple and quick, this method provides only relatively superficial, averaged data of the permeability, diffusivity, and solubility of gas or vapor species in the membrane. The present manuscript discusses a more sophisticated computational method to determine the transport properties on the basis of a fit of the entire permeation curve, including the transient period. The traditional tangent method and the fitting procedure were compared for the transport of six light gases (H2, He, O2, N2, CH4, and CO2) and ethane and ethylene in mixed matrix membranes (MMM) based on Pebax®1657 and the metal–organic framework (MOF) CuII2(S,S)-hismox·5H2O. Deviations of the experimental data from the theoretical curve could be attributed to the particular MOF structure, with cavities of different sizes. The fitting procedure revealed two different effective diffusion coefficients for the same gas in the case of methane and ethylene, due to the unusual void morphology in the MOFs. The method was furthermore applied to mixed gas permeation in an innovative constant-pressure/variable-volume setup with continuous analysis of the permeate composition by an on-line mass-spectrometric residual gas analyzer. This method can provide the diffusion coefficient of individual gas species in a mixture, during mixed gas permeation experiments. Such information was previously inaccessible, and it will greatly enhance insight into the mixed gas transport in polymeric or mixed matrix membranes.

Mixed matrix membranes for hydrocarbons separation and recovery: a critical review

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Sara Najari ◽  
Samrand Saeidi ◽  
Fausto Gallucci ◽  
Enrico Drioli
Keyword(s):  
High Performance ◽  
Polymeric Materials ◽  
Mixed Matrix Membranes ◽  
Filler Materials ◽  
Successful Implementation ◽  
Separation And Purification ◽  
Light Hydrocarbons ◽  
Mixed Matrix ◽  
Suitable Combination ◽  
Matrix Membranes

Abstract The separation and purification of light hydrocarbons are significant challenges in the petrochemical and chemical industries. Because of the growing demand for light hydrocarbons and the environmental and economic issues of traditional separation technologies, much effort has been devoted to developing highly efficient separation techniques. Accordingly, polymeric membranes have gained increasing attention because of their low costs and energy requirements compared with other technologies; however, their industrial exploitation is often hampered because of the trade-off between selectivity and permeability. In this regard, high-performance mixed matrix membranes (MMMs) are prepared by embedding various organic and/or inorganic fillers into polymeric materials. MMMs exhibit the advantageous and disadvantageous properties of both polymer and filler materials. In this review, the influence of filler on polymer chain packing and membrane sieving properties are discussed. Furthermore, the influential parameters affecting MMMs affinity toward hydrocarbons separation are addressed. Selection criteria for a suitable combination of polymer and filler are discussed. Moreover, the challenges arising from polymer/filler interactions are analyzed to allow for the successful implementation of this promising class of membranes.

scholarly journals A Review of the Recent Progress in the Development of Nanocomposites Based on Poly(ether-block-amide) Copolymers as Membranes for CO2 Separation

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 10
Author(s):  
Gabriele Clarizia ◽  
Paola Bernardo
Keyword(s):  
Flue Gas ◽  
Recent Progress ◽  
Global Strategy ◽  
Sustainable Growth ◽  
Mixed Matrix Membranes ◽  
Filler Materials ◽  
Key Factors ◽  
Mixed Matrix ◽  
Separation Of Co2 ◽  
Matrix Membranes

An inspiring challenge for membrane scientists is to exceed the current materials’ performance while keeping the intrinsic processability of the polymers. Nanocomposites, as mixed-matrix membranes, represent a practicable response to this strongly felt need, since they combine the superior properties of inorganic fillers with the easy handling of the polymers. In the global strategy of containing the greenhouse effect by pursuing a model of sustainable growth, separations involving CO2 are some of the most pressing topics due to their implications in flue gas emission and natural gas upgrading. For this purpose, Pebax copolymers are being actively studied by virtue of a macromolecular structure that comprises specific groups that are capable of interacting with CO2, facilitating its transport with respect to other gas species. Interestingly, these copolymers show a high versatility in the incorporation of nanofillers, as proved by the large number of papers describing nanocomposite membranes based on Pebax for the separation of CO2. Since the field is advancing fast, this review will focus on the most recent progress (from the last 5 years), in order to provide the most up-to-date overview in this area. The most recent approaches for developing Pebax-based mixed-matrix membranes will be discussed, evidencing the most promising filler materials and analyzing the key-factors and the main aspects that are relevant in terms of achieving the best effectiveness of these multifaceted membranes for the development of innovative devices.

scholarly journals Pervaporative Dehydration of Methanol Using PVA/Nanoclay Mixed Matrix Membranes: Experiments and Modeling

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 435
Author(s):  
Asmaa Selim ◽  
András Jozsef Toth ◽  
Daniel Fozer ◽  
Agnes Szanyi ◽  
Péter Mizsey
Keyword(s):  
Separation Efficiency ◽  
Water Solution ◽  
Water Concentration ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Feed Water ◽  
Mixed Matrix ◽  
Feed Concentration ◽  
Modified Method ◽  
Matrix Membranes

Encouraged by the industrial problem of removing water from methanol solutions, a simple exfoliation method is applied to prepare polyvinyl alcohol (PVA)/laponite nanoclay mixed matrix membranes (MMMs). The membranes are used for the pervaporative dehydration of the methanol-water solution. The influence of the nanoclay content on the pervaporation performance is investigated. The results show that the PVA10 membrane containing 10 wt% Laponite loading exhibits excellent separation efficiency; therefore, all the experimental work is continued using the same membrane. Additionally, the effects of feed concentration and temperature on methanol dehydration performance are thoroughly investigated. The temperatures are ranging from 40–70 °C and the water feed concentrations from 1–15 wt% water. A maximum separation factor of 1120 can be observed at 40 °C and the feed water concentration of 1 wt%. Remarkably, two solution–diffusion models, the Rautenbach (Model I) and modified method by Valentínyi et al. (Model II), are used and compared to evaluate and describe the pervaporation performance of the mixed matrix membrane. Model II proves to be more appropriate for the modeling of pervaporative dehydration of methanol than Model I. This work demonstrates that PVA/nanoclay mixed matrix membranes prepared can efficiently remove water from methanol aqueous solution with pervaporation and the whole process can be accurately modeled with Model II.

scholarly journals Glassy PEEK-WC vs. Rubbery Pebax®1657 Polymers: Effect on the Gas Transport in CuNi-MOF Based Mixed Matrix Membranes

2020 ◽  
Vol 10 (4) ◽  
pp. 1310 ◽  
Author(s):  
Elisa Esposito ◽  
Rosaria Bruno ◽  
Marcello Monteleone ◽  
Alessio Fuoco ◽  
Jesús Ferrando Soria ◽  
...  
Keyword(s):  
Gas Transport ◽  
Effective Diffusivity ◽  
Polymeric Membranes ◽  
Mixed Matrix Membranes ◽  
Mechanical And Thermal Properties ◽  
Mixed Matrix ◽  
Mixed Gas ◽  
Scanning Calorimetry ◽  
The Ideal ◽  
Matrix Membranes

Mixed matrix membranes (MMMs) are seen as promising candidates to overcome the fundamental limit of polymeric membranes, known as the so-called Robeson upper bound, which defines the best compromise between permeability and selectivity of neat polymeric membranes. To overcome this limit, the permeability of the filler particles in the MMM must be carefully matched with that of the polymer matrix. The present work shows that it is not sufficient to match only the permeability of the polymer and the dispersed phase, but that one should consider also the individual contributions of the diffusivity and the solubility of the gas in both components. Here we compare the gas transport performance of two different MMMs, containing the metal–organic framework CuNi-MOF in the rubbery Pebax®1657 and in the glassy poly(ether-ether-ketone) with cardo moiety, PEEK-WC. The chemical and structural properties of MMMs were investigated by means of FT-IR spectroscopy, scanning electron microscopy and EDX analysis. The influence of MOF on the mechanical and thermal properties of both polymers was investigated by tensile tests and differential scanning calorimetry, respectively. The MOF loading in Pebax®1657 increased the ideal H2/N2 selectivity from 6 to 8 thanks to an increased H2 permeability. In general, the MOF had little effect on the Pebax®165 membranes because an increase in gas solubility was neutralized by an equivalent decrease in effective diffusivity. Instead, the addition of MOF to PEEK-WC increases the ideal CO2/CH4 selectivity from 30 to ~48 thanks to an increased CO2 permeability (from 6 to 48 Barrer). The increase in CO2 permeability and CO2/CH4 selectivity is maintained under mixed gas conditions.

Solubility selectivity-enhanced SIFSIX-3-Ni-containing mixed matrix membranes for improved CO2/CH4 separation efficiency

2021 ◽  
pp. 119390
Author(s):  
Ju Ho Shin ◽  
Ming-Yang Kan ◽  
Jin-Woo Oh ◽  
Hyun Jung Yu ◽  
Li-Chiang Lin ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Matrix Membranes

scholarly journals CO2/CH4 and He/N2 Separation Properties and Water Permeability Valuation of Mixed Matrix MWCNTs-Based Cellulose Acetate Flat Sheet Membranes: A Study of the Optimization of the Filler Material Dispersion Method

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 280
Author(s):  
Tobias Esser ◽  
Tobias Wolf ◽  
Tim Schubert ◽  
Jan Benra ◽  
Stefan Forero ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cellulose Acetate ◽  
Water Permeability ◽  
Filler Material ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Feed Concentration ◽  
Water Permeation ◽  
Cellulose Acetate Membranes ◽  
Matrix Membranes

The main scope of this work is to develop nano-carbon-based mixed matrix cellulose acetate membranes (MMMs) for the potential use in both gas and liquid separation processes. For this purpose, a variety of mixed matrix membranes, consisting of cellulose acetate (CA) polymer and carbon nanotubes as additive material were prepared, characterized, and tested. Multi-walled carbon nanotubes (MWCNTs) were used as filler material and diacetone alcohol (DAA) as solvent. The first main objective towards highly efficient composite membranes was the proper preparation of agglomerate-free MWCNTs dispersions. Rotor-stator system (RS) and ultrasonic sonotrode (USS) were used to achieve the nanofillers’ dispersion. In addition, the first results of the application of the three-roll mill (TRM) technology in the filler dispersion achieved were promising. The filler material, MWCNTs, was characterized by scanning electron microscopy (SEM) and liquid nitrogen (LN2) adsorption-desorption isotherms at 77 K. The derivatives CA-based mixed matrix membranes were characterized by tensile strength and water contact angle measurements, impedance spectroscopy, gas permeability/selectivity measurements, and water permeability tests. The studied membranes provide remarkable water permeation properties, 12–109 L/m2/h/bar, and also good separation factors of carbon dioxide and helium separations. Specifically, a separation factor of 87 for 10% He/N2 feed concentration and a selectivity value of 55.4 for 10% CO2/CH4 feed concentration were achieved.

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