Performance Enhancement of Mixed Matrix Membranes through the Incorporation of Alkanolamines for CO2/CH4 Separation (original) (raw)
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Chemical engineering transactions, 2015
Natural gas contains some impurities liked acid gases (CO2 & H2S), which can affect the environment. Currently, the main focus of the research is to invent the new membranes materials for gas separation. Native polyethersulfone (PES) and PES/carbon molecular sieve (CMS) mixed matrix membranes were fabricated by solvent evaporation method using N-Methyl-2-pyrrolidone (NMP) as solvent. The final membranes were characterized in term of morphology and thermal stability by using field emission scanning electron microscopy (FESEM) and thermal gravimetric analyser (TGA). FESEM analysis of developed membranes was revealed that the final membranes have acceptable contacts between filler particles and the polymer chains with the thickness in the ranges from 51.37 µm to 67.68 µm. CMS inorganic particles were dispersed well within organic (polymer) matrix. Due to the addition of CMS the developed membrane exhibit the improved thermal stability. In the pure gas permeation, the effect of CMS load...
Royal Society Open Science
The key challenge in the synthesis of composite mixed matrix membrane (MMMs) is the incompatible membrane fabrication using porous support in the dry–wet phase inversion technique. The key objective of this research is to synthesize thin composite ternary (amine) mixed matrix membranes on microporous support by incorporating 10 wt% of carbon molecular sieve (CMS) and 5–15 wt% of diethanolamine (DEA) in polyethersulfone (PES) dope solution for the separation of carbon dioxide (CO 2 ) from methane (CH 4 ) at high-pressure applications. The developed membranes were evaluated for their morphological structure, thermal and mechanical stabilities, functional groups, as well as for CO 2 -CH 4 separation performance at high pressure (10–30 bar). The results showed that the developed membranes have asymmetric structure, and they are mechanically strong at 30 bar. This new class of PES/CMS/DEA composite MMMs exhibited improved gas permeance compared to pure PES composite polymeric membrane. C...
CO2 gas separation using mixed matrix membranes based on polyethersulfone/MIL-100(Al)
Open Chemistry, 2021
The excessive use of natural gas and other fossil fuels by the industrial sector leads to the production of great quantities of gas pollutants, including CO2, SO2, and NO x . Consequently, these gases increase the temperature of the earth, producing global warming. Different strategies have been developed to help overcome this problem, including the utilization of separation membrane technology. Mixed matrix membranes (MMMs) are hybrid membranes that combine an organic polymer as a matrix and an inorganic compound as a filler. In this study, MMMs were prepared based on polyethersulfone (PES) and a type of metal–organic framework (MOF), Materials of Institute Lavoisier (MIL)-100(Al) [Al3O(H2O)2(OH)(BTC)2] (BTC: benzene 1,3,5-tricarboxylate) using a phase inversion method. The influence on the properties of the produced membranes by addition of 5, 10, 20, and 30% MIL-100(Al) (w/w) to the PES was also investigated. Fourier-transform infrared spectroscopy (FTIR) analysis indicated that ...
Functionalized KIT-6/Polysulfone Mixed Matrix Membranes for Enhanced CO2/CH4 Gas Separation
Polymers, 2020
The development of mixed matrix membranes (MMMs) for effective gas separation has been gaining popularity in recent years. The current study aimed at the fabrication of MMMs incorporated with various loadings (0–4 wt%) of functionalized KIT-6 (NH2KIT-6) [KIT: Korea Advanced Institute of Science and Technology] for enhanced gas permeation and separation performance. NH2KIT-6 was characterized by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and N2 adsorption–desorption analysis. The fabricated membranes were subjected to FESEM and FTIR analyses. The effect of NH2KIT-6 loading on the CO2 permeability and ideal CO2/CH4 selectivity of the fabricated membranes were investigated in gas permeation and separation studies. The successfulness of (3-Aminopropyl) triethoxysilane (APTES) functionalization on KIT-6 was confirmed by FTIR analysis. As observed from FESEM images, MMMs with no voids in the matrix were successfully fab...
Matrimid mixed matrix membranes for enhanced CO2/CH4 separation
Journal of Polymer Engineering, 2016
In this study, Matrimid mixed matrix membranes (MMMs) were prepared for CO2/CH4 separation. MMMs were fabricated for improving the permeability and ideal selectivity of Matrimid membranes. Matrimid 5218 was used as a polymer matrix, and inorganic particles were used as additives. MMMs with a thickness of 33–38 μm were prepared at room temperature. The effects of the types and different amounts of additives on the permeability and ideal selectivity of MMMs were investigated by using a gas separation membrane unit. Scanning electron microscopy and atomic force microscopy images were used for checking the dispersion and agglomeration of additives within polymer matrices. Thermal gravimetric analysis showed that MMMs became much more thermally stable than pristine membranes. The decomposition temperatures (Td) of MMMs were increased as compared to those of pristine membranes. The results of Fourier transform infrared spectroscopy analysis of MMMs and pristine membranes were recorded. Th...
Mixed matrix membranes (MMMs) comprising polysulfone (PSF) Udel® P-1700 and synthesized carbon molecular sieve (CMS) particles (<25 µm) have been fabricated and characterized. CMS were synthesized by using polyacrylonitrile (PAN) as polymer precursor. The casting process was performed at the processing temperature close to T g of PSF in order to maintain the flexibility of polymer during film formation. This study investigated the effects of CMS loadings (10, 20, 30 and 35wt %) on the morphology and the gas separation performance of PSF-CMS MMMs. The fabricated MMMs were characterized using TGA, DSC, FESEM and single gas permeation test using high purity O 2 and N 2 . Based on FESEM micrograph, a good polymer-sieve adhesion was achieved in MMMs using the combination of PSF-CMS even at high sieve loading (up to 35 wt %). The formation of 'sieve-in-the-cage' morphology in PSF-CMS MMMs has been minimized to a great extend by implementing casting procedure at the operating temperature close to the T g of polymer matrix. The O 2 and N 2 permeability for MMMs were increased with increasing CMS loading; while at 20wt% CMS loading the O 2 /N 2 selectivity attain the highest value which is 5.97 with the O 2 permeability of 7.9617 barrers.
Carbon dioxide has been well associated with greenhouse effect,and due to its corrosive nature it is an undesirable compound. A variety of physical-chemical processes are available for the removal of carbon dioxide. Previous attempts in this field have established alkanolamine group has the capability to remove carbon dioxide. So, this study combined the polymeric membrane and alkanolamine solutions to fabricate the amine polymeric membrane (APM) to remove carbon dioxide (CO 2 ). This study entails the effect of three types of amines, monoethanolamine (MEA), diethanolamine (DEA), and methyldiethanolamine (MDEA). The effect of each alkanolamine group on the morphology and performance of polyether sulfone (PES) polymeric membranes was studied. Flat sheet membranes were fabricated by solvent evaporation method by adding polymer and different alkanolamine solutions in the N-Methyl-2pyrrolidone (NMP) solvent. The final membranes were characterized by using Field Emission Electron Microscope (FESEM), Fourier Transform Infrared (FTIR), and Thermo-Gravimetric Analysis (TGA). The membrane separation performance was studied. The PES-DEA and PES-MDEA membrane has good ability to remove carbon dioxide.
Chinese Journal of Chemical Engineering, 2017
Highly selective separation of CO 2 from its methane-containing binary gas mixture can be achieved by using Poly(ether-block-amide) (PEBAX) mixed matrix membranes (MMMs). According to FESEM and AFM analyses, silica-based nanoparticles were homogenously integrated within the polymer matrix, facilitating penetration of CO 2 through the membrane while acting as barrier for methane gas. The membrane containing 4.6 wt% fumed silica (FS) (PEBAX/4.6 wt% FS) exhibits astonishing selectivity results where binary gas mixture of CO 2 /CH 4 used as feed gas. As detected by gas chromatography, in the permeate side, data showed a significant increase of CO 2 permeance, whilst CH 4 transport through the mixed matrix membrane was not detectable. Moreover, PEBAX/4.6 wt% FS greatly exceeds the Robeson limit. According to data reported on CO 2 /CH 4 gas pair separation in the literature, the results achieved in this work are beyond those data reported in the literature, particularly when PEBAX/4.6 wt% FS membrane was utilized.
Separation and Purification Technology, 2019
Polydimethylsiloxane (PDMS) mixed matrix membranes (MMM)s containing microporous adsorptive carbon nanoparticles (ACNs) are developed for CO 2 /CH 4 and C 3 H 8 /CH 4 separation. The ACNs are produced by the pyrolysis of a phenolic resin precursor at 700 °C and transformed into fine particles through ball-milling. For functionalization of the particles and widening of the pores, the prepared ACNs undergo ozone treatment to increase the sorption capacity and to reduce diffusional limitations. Successful accomplishment of modification is evidenced by pore size distribution, X-ray diffraction, and Fourier transform infrared spectra analyses. MMMs containing different amounts of both native ACNs (ACN-N) and oxidized ACNs (ACN-O) are evaluated in terms of permeability, solubility and diffusivity coefficients for target gases. Based on the results, higher pressure and lower temperature promote gas separation due to capillary condensation of penetrants in the micropores of the particles present in the MMMs. Activation energy of permeation, diffusion, and enthalpy of sorption are also determined for MMMs and compared to the pure PDMS membrane. The real selectivity in PDMS/ACN-O (10%) membrane for CO 2 /CH 4 and C 3 H 8 /CH 4 are 57.3% and 53.1% higher than those in pure PDMS membrane. This enhancement is attributed to the selective adsorption and surface diffusion of the more adsorbable component in ACNs as well as partial diffusion hindrance of less adsorbing component (CH 4) in the presence of more adsorbable component (e.g., CO 2 , C 3 H 8) onto surface of ACN pores. Also, CO 2 and C 3 H 8 permeability improved by 61.6% and 47.7% respectively, compared to the pure PDMS membrane and is attributed to the formation of extra free volume in PDMS matrix as a result of chain packing disruption in the presence of ACNs. According to the findings, the fabricated membranes are promising candidates for natural gas sweetening and hydrocarbon recovery.
Characterization of Polyethersulfone/Cloisite 15A Mixed Matrix Membrane for CO2/CH4 Separation
Jurnal Teknologi, 2014
Asymmetric hybrid organic-inorganic clay mineral polyethersulfone (PES) flat sheet membranes were prepared from solution containing Cloisite15A® (C15A) in the mixture of solvent and polymer. Neat PES and MMM were prepared through dry/wet phase inversion method. The newly developed membranes were characterized by means of SEM. The effect of filler addition, evaporation time and coating protocol towards the performance of the membrane was investigated. The measurement was carried out at room temperature and the upstream pressure was 3 bar while the downstream pressure was atmospheric. Experimental results showed that selectivity for MMM fabricated with 0.25 wt% clay loading at evaporation time of 40 s is lower compared to those prepared at higher evaporation time. After coating with silicone rubber solution and heat treated, the resultant membranes exhibited selectivity enhancement of CO2/CH4 from 7.9 to 28.4 for pristine PES, while PES/C15A1 and PES/C15A2 showed a selectivity improve...