Mixed matrix membranes based on polysulfone and rice husk extracted silica for CO2 separation

Mixed matrix membranes (MMM) based on polysulfone and chemically modified clinoptilolite were prepared. Clinoptilolite enriched with Ca2+, K+, and Na+ by ion exchange at two test temperatures was prepared. Chemical composition was monitored by energy dispersive X‐ray spectroscopy. X‐ray diffraction, thermogravimetric analysis, and N2 adsorption–desorption isotherms were also performed. Thermal and morphological properties of MMM were evaluated. CH4/CO2 gas mixture permeability tests at different upstream pressure were carried out. Type of exchanged cation in modified clinoptilolite affected the CO2 permeability. An improvement on the CO2/CH4 selectivity values in the MMM compared to the polymeric membrane was appreciated. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45659.

Section: Resultssupporting

confidence: 50%

Effect of chemically modified clinoptilolite on the thermal, morphological, and gas separation properties of mixed matrix membranes

León

Meléndez‐Ortiz

Hernández-Silva

et al. 2017

“…To compete with conventional sweetening techniques, it must be high in purity, the life of membranes obtaining high purity product, and process efficiency; highly selective polymeric membranes is difficult due to inherent trade‐off. However, only cellulose‐based membranes systems have been scaled up, because polymer membranes have some limitations and insecure behaviors at high temperatures and pressures even some fly larvae have potential to degrade cellulose . They also have poor solvent purification (pervaporation) and low performance in filtration process (wastewater treatment) …”

Section: Introductionmentioning

confidence: 99%

Development of ethanolamine‐based ionic liquid membranes for efficient CO₂/CH₄ separation

Rehman

Rafiq

Muhammad

et al. 2017

Self Cite

This study is focused on the development of ionic liquids (ILs) based polymeric membranes for the separation of carbon dioxide (CO2) from methane (CH4). The advantage of ILs in selective CO2 absorption is that it enhances the CO2 selective separation for the ionic liquid membranes (ILMs). ILMs are developed and characterized with two different ILs using the solution‐casting method. Three different blend compositions of ILs and polysulfone (PSF) are selected for each ILMs 10, 20, and 30 wt %. Effect of the different types of ILs such as triethanolamine formate (TEAF) and triethanolamine acetate (TEAA) are investigated on PSF‐based ILMs. Field emission scanning electron microscopy analysis of the membranes showed reasonable homogeneity between the ILs and PSF. Thermogravimetric analysis showed that by increasing the ILs loading thermal stability of the membranes improved. Mechanical analysis on developed membranes showed that ILs phase reduced the amount of plastic flow of the PSF phase and therefore, fracture takes place at gradually lower strains with increasing ILs content. Gas permeation evaluation was carried out on the developed membranes for CO2/CH4 separation between 2 bar to 10 bar feed pressure. Results showed that CO2 permeance increases with the addition of ILs 10–30 wt % in ILMs. With 20–30 wt % TEAF‐ILMs and TEAA‐ILMs, the highest selectivity of a CO2/CH4 53.96 ± 0.3, 37.64 ± 0.2 and CO2 permeance 69.5 ± 0.6, 55.21 ± 0.3 is observed for treated membrane at 2–10 bar. The selectivity using mixed gas test at various CO2/CH4 compositions shows consistent results with the ideal gas selectivity. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45395.

“…Even though the experimental performance of MMMs did not overcome the performance for the pair of gases CO 2 /CH 4 reported in the literature, it is noteworthy the addition of 10 wt % of clinoptilolite impregnated with EA and BHPA represented an important approach to the upper bound. In addition, a comparison of the performance of some polysulfone‐based MMMs reported recently, and the MMMs reported in this work are listed in Table S1 . It could be seen that modified clinoptilolite could be considered as a good candidate to be used as filler in MMM to improve the CO 2 permeability and CO 2 /CH 4 selectivity.…”

Section: Resultsmentioning

confidence: 81%

Amine‐impregnated natural zeolite as filler in mixed matrix membranes for CO₂/CH₄ separation

León

Yeverino‐Miranda²,

Montes‐Luna³

et al. 2019

Flat mixed matrix membranes (MMMs) comprising polysulfone and clinoptilolite-type natural zeolite were prepared by casting. Zeolite was modified with three alkylamines: ethanolamine (EA), bis(2-hydroxypropyl)amine (BHPA), and polyethylenimine (PEI) by the impregnation method. Impregnated zeolite samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and N 2 adsorption-desorption. The alkylamine loading extent determined by thermogravimetric analysis was 5.2, 4.8, and 8.5% for EA, BHPA, and PEI, respectively. Analyses of MMMs showed that the incorporation of impregnated zeolite affected the glasstransition temperature (T g ) and mixed-gas transport properties. In this regard, a decreasing trend of the T g values from 185.5 C for the polymeric membrane up to 176.6 C for Clino-EA-based MMM was recorded. In addition, the gas separation performance was evaluated at two different feed pressures. At 50 psi, MMMs showed an enhancement up to 30% on the CO 2 permeability (22.79 Barrer) and 55% on the CO 2 /CH 4 selectivity (45.78) in comparison with the polymeric membrane (CO 2 permeability 17.34 Barrer; CO 2 /CH 4 selectivity 29.38). These values varied depending on the alkylamine, BHPA being the most selective.