scholarly journals Structure and Gas Transport Behavior of Polysulfone/ Polyacrylonitrile–carbon Molecular Sieve Mixed Matrix Membrane

2017 ◽  
Vol 12 (1) ◽  
Author(s):  
W. A.W. Rafidah ◽  
A. F. Ismail ◽  
T. Matsuura ◽  
S. A. Hashemifard ◽  
A. Suhaimi
Keyword(s):  
Gas Separation ◽  
Molecular Sieve ◽  
Gas Transport ◽  
Gas Permeation ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Carbon Molecular Sieve ◽  
Scanning Calorimetry ◽  
Transport Behavior ◽  
Interfacial Gap

Mixed matrix membrane (MMM) comprising of polyacrylonitrile based carbon molecular sieve (PAN–CMS) and polysulfone (PSF) Udel® P–1700 were synthesized and characterized as an alternative material for gas separation. The structure and the gas transport behavior of this hybrid system was investigated by thorough analysis using thermal gravimetry analysis (TGA), differential scanning calorimetry (DSC), field emission scanning microscopy (FESEM) and single gas permeation test. The thermal analysis based on TGA and DSC results indicated that Tgs and Tds of PSF have been extended to higher temperatures. These findings suggest that PAN–CMS have improved the thermal property of PSF in the MMM system. FESEM micrographs revealed that the PSF/ PANCMS MMMs possess an acceptable PSF and PAN–CMS interfacial adhesion with the average interfacial gap size of less than 1ìm. The excellent gas separation capability of the PSF/ PAN–CMS MMM was proven as the hybrid film with 20 wt% PAN–CMS loading exhibited higher O2/N2 selectivity (5.80) than that of pure PSF film (5.45).

scholarly journals Mixed Matrix Membrane Performance Prediction for Gas Separation using Modified Models

2017 ◽  
Vol 13 (1) ◽  
Author(s):  
A. Salimi ◽  
O. Bakhtiari ◽  
M. K. Moghaddam ◽  
T. Mohammadi
Keyword(s):  
Gas Separation ◽  
Molecular Sieves ◽  
Molecular Sieve ◽  
Membrane Separation ◽  
Maxwell Model ◽  
Industrial Applications ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Two Parameters

Gas separation using membrane processes are potentially economical in industrial scale. Two parameters are used for analyzing the membrane separation performance: permeability and selectivity. There is a trade off between them for polymeric membranes that makes it impossible to increase both of them simultaneously. Molecular sieve membranes, on the other hand, exhibit high permeability and selectivity but are brittle in nature and costly. A new generation of membranes has made many hopes to use simultaneously both desired properties of polymers and molecular sieves in a structure called “mixed matrix membrane (MMM)” where a molecular sieve is incorporated within a polymer matrix. As other branches of science and engineering, having a tool to predict MMMs performance seems to be essential to save time and money for research and industrial applications. Many mathematical models were developed to predict MMMs performance based on separation performance of fillers and polymers. Maxwell model is the simplest model developed for prediction of electrical properties of composite materials but it is not perfect for all cases. Some modifications were performed on Maxwell model and some other modified models were developed for better prediction of MMMs separation performance. In this research, modified Maxwell and Bruggeman models were employed to predict gas separation performance of some MMMs in the current work and the results were acceptable for all non–ideal cases which might be occurred in MMMs structure.

Effect of fixed carbon molecular sieve (CMS) loading and various di-ethanolamine (DEA) concentrations on the performance of a mixed matrix membrane for CO2/CH4 separation

RSC Advances ◽  
2015 ◽  
Vol 5 (75) ◽  
pp. 60814-60822 ◽  
Author(s):  
Rizwan Nasir ◽  
Hilmi Mukhtar ◽  
Zakaria Man ◽  
Maizatul Shima Shaharun ◽  
Mohamad Zailani Abu Bakar
Keyword(s):  
Molecular Sieves ◽  
Molecular Sieve ◽  
Mixed Matrix Membranes ◽  
Inorganic Filler ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Fixed Carbon ◽  
Carbon Molecular Sieve ◽  
Carbon Molecular Sieves ◽  
The Third

Polyethersulfone (PES) as a polymer along with carbon molecular sieves (CMS) as an inorganic filler and di-ethanolamine (DEA) as the third component were used to fabricate amine mixed matrix membranes (A3Ms).

scholarly journals A Novel Composite Material UiO-66@HNT/Pebax Mixed Matrix Membranes for Enhanced CO2/N2 Separation

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 693
Author(s):  
Fei Guo ◽  
Bingzhang Li ◽  
Rui Ding ◽  
Dongsheng Li ◽  
Xiaobin Jiang ◽  
...  
Keyword(s):  
Composite Material ◽  
Gas Separation ◽  
Halloysite Nanotubes ◽  
Gas Permeation ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Transport Pathways ◽  
Gas Separation Performance

Mixing a polymer matrix and nanofiller to prepare a mixed matrix membrane (MMM) is an effective method for enhancing gas separation performance. In this work, a unique UiO-66-decorated halloysite nanotubes composite material (UiO-66@HNT) was successfully synthesized via a solvothermal method and dispersed into the Pebax-1657 matrix to prepare MMMs for CO2/N2 separation. A remarkable characteristic of this MMM was that the HNT lumen provided the highway for CO2 diffusion due to the unique affinity of UiO-66 for CO2. Simultaneously, the close connection of the UiO-66 layer on the external surface of HNTs created relatively continuous pathways for gas permeation. A suite of microscopy, diffraction, and thermal techniques was used to characterize the morphology and structure of UiO-66@HNT and the membranes. As expected, the embedding UiO-66@HNT composite materials significantly improved the separation performances of the membranes. Impressively, the as-obtained membrane acquired a high CO2 permeability of 119.08 Barrer and CO2/N2 selectivity of 76.26. Additionally, the presence of UiO-66@HNT conferred good long-term stability and excellent interfacial compatibility on the MMMs. The results demonstrated that the composite filler with fast transport pathways designed in this study was an effective strategy to enhance gas separation performance of MMMs, verifying its application potential in the gas purification industry.

Gas transport behavior of DMDCS modified MCM-48/polysulfone mixed matrix membrane coated by PDMS

2011 ◽  
Vol 28 (10) ◽  
pp. 2069-2075 ◽  
Author(s):  
Abolfazl Jomekian ◽  
Seyed Ali Akbar Mansoori ◽  
Negin Monirimanesh ◽  
Alireza Shafiee
Keyword(s):  
Gas Transport ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Transport Behavior

scholarly journals CARBON DIOXIDE/METHANE SEPARATION PERFORMANCE BY MIXED MATRIX MEMBRANE FROM POLYSULFONE/ HALLOYSITE NANOTUBES

2020 ◽  
Vol 82 (3) ◽  
Author(s):  
Noor Maizura Ismail ◽  
Nur Afaliza Yusaini ◽  
Jannah Jafa ◽  
S. M. Anisuzzaman ◽  
Chiam Chel Ken ◽  
...  
Keyword(s):  
Gas Separation ◽  
Halloysite Nanotubes ◽  
Skin Layer ◽  
Gas Permeation ◽  
Mixed Matrix Membranes ◽  
Inorganic Filler ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Morphological Differences

Gas separation by using membrane-based technology is one of the rising technologies used in the industry. It has many advantages such as low in cost and energy consumption. However, this technology is limited because of the "trade-off" exists between permeability and selectivity of the membrane. Thus, in this study, an inorganic filler, halloysite nanotube is modified with 3-aminopropyl(triethoxysilane) and then incorporated into the polysulfone polymer and the performance of the mixed matrix membranes (MMMs) is investigated. MMMs were analyzed by using SEM, FTIR, tensile and gas permeation tests which studied the morphological differences, mechanical strength, and membrane permeability and selectivity towards CO2 and CH4 respectively. The performance of the MMMs was compared with neat membrane and MMMs with unmodified HNTs. SEM results show an increase of 111% on the thickness of the dense skin layer of MMMs with APTES-modified HNTs compared to the neat membrane and the MMMs with unmodified HNTs. Elongation at break for MMMs with 3-APTES-modified HNTs also increased to 24.22%. The gas separation performance of the MMMs with 3-APTES modified HNTs shows an overall increase of 25.37% in the membrane selectivity compared to MMMs with unmodified HNTs while when coating is done, the selectivity of the MMMs with 3-APTES modified HNTs shows an increase from 0.845 to 10.158 for a pressure of 2 bar showing that coating helps in increasing the selectivity of the membrane.

Synthesis and Preparation of Asymmetric PSf/ZIF-8 Mixed Matrix Membrane for CO2/CH4 Separation

2014 ◽  
Vol 69 (9) ◽  
Author(s):  
Nik Abdul Hadi Md Nordin ◽  
Ahmad Fauzi Ismail ◽  
Azeman Mustafa
Keyword(s):  
Polymer Matrix ◽  
Filler Loading ◽  
Gas Permeation ◽  
Mixed Matrix Membrane ◽  
Inversion Method ◽  
X Ray Diffraction ◽  
Mixed Matrix ◽  
Scanning Calorimetry ◽  
Xrd Pattern ◽  
Nano Size

Utilizing nano-size filler into polymer matrix would overcome challenges in developing MMM  by providing good dispersion in polymer matrix, high contact polymer-filler even at low filler loading. Asymmetric neat Polysulfone (PSf) and PSf/Zeolitic Imidazole Framework-8 (PSf/ZIF-8) mixed matrix membrane was prepared using dry/wet inversion method. Membrane prepared was coated with 3wt% of polydimethylsiloxane (PDMS) in n-hexane and undergoes heat treatment. The membranes was characterized using x-ray diffraction (XRD), thermagravimetric analysis (TGA), differential scanning calorimetry (DSC), and gas permeation test at 4 bar. XRD pattern revealed that ZIF-8 was successfully synthesis with crystal size around 73nm. Lowered membrane Tg after embodiment of ZIF-8 suggests that additional free volume form, while thermal stability up to 350°C related to ZIF-8 stability. Neat PSf prepared shows CO2 permeance at 4.97 GPU with CO2/CH4 selectivity at 7.52. Interestingly, incorporation of ZIF-8 showing improvement for both CO2 permeance and CO2/CH4 selectivity up to 51% and 47% respectively. Thus, employing nano ZIF-8 as filler into PSf matrix has resultant promising membrane for CO2/CH4 separation.

Effect of Carbon Molecular Sieve (CMS) Concentration on Mixed Matrix Membranes (MMMs) Performance for Carbon Dioxide Removal

2015 ◽  
Vol 754-755 ◽  
pp. 869-873 ◽  
Author(s):  
Rizwan Nasir ◽  
Hilmi Mukhtar ◽  
Maizatul Shima Shaharun ◽  
Zakaria Man
Keyword(s):  
Molecular Sieve ◽  
Gas Permeation ◽  
Polymer Chains ◽  
Mixed Matrix Membranes ◽  
Size Discrimination ◽  
Mixed Matrix ◽  
Carbon Molecular Sieve ◽  
Solution Casting Method ◽  
Pes Membrane ◽  
Matrix Membranes

Different compositions of carbon molecular sieve (CMS) were incorporated in polyethersulfone (PES) matrix to fabricate mixed matrix membranes (MMMs) by solution casting method. The characterization was carried out using field emission scanning electron microscopy (FESEM) analysis to investigate the morphology of membrane. FESEM images showed acceptable contacts between the filler particles and the polymer chains. The performance of the developed membrane is analyzed by single gas permeation measurement of high purity CO2 and CH4. Both CO2 permeance and CO2/CH4 selectivity increased with CMS loadings as compared to pure PES membrane. Experimental results showed that the highest value of CO2 permeance (66.71 GPU) and CO2/CH4 selectivity (10.94) can be achieved with 30 wt. % loading of CMS particles. This can be credited to size discrimination of CMS pores that falls between CO2 and CH4 kinetic diameters.

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