scholarly journals Poly (Vinyl Alcohol) Composite Membrane with Polyamidoamine Dendrimers for Efficient Separation of CO2/H2 and CO2/N2

2021 ◽  
Author(s):  
yaxin zhao ◽  
Huafeng Tian ◽  
yuge ouyang ◽  
Aimin Xiang ◽  
Xiaogang Luo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Gas Separation ◽  
Composite Membrane ◽  
High Selectivity ◽  
Gas Adsorption ◽  
Separation Efficiency ◽  
Separation Process ◽  
Poly Vinyl Alcohol ◽  
Separation Performance ◽  
Efficient Separation

Abstract Although polyvinyl alcohol (PVA) membranes are commonly used for CO2 separation, there is still large development space in mechanical properties and high selectivity of the gas separation process. In this study, the gas separation performance and mechanical properties of the (PVA/Cu2+) substrate membranes were improved by introducing polyamidoamine (PAMAM). PAMAM had an important effect on the gas adsorption and separation performance of the membrane. In addition, the gas adsorption and separation properties of the PVA/Cu2+/PAMAM membrane (PPCm) were analyzed and studied when the inlet gas pressure and the species of mixed gases were variable. The results showed that the crystallinity and mechanical properties of the membrane with the PAMAM had been significantly improved. Young’s modulus of PPCm with 30% PAMAM was 132% higher than that of the PVA/Cu2+ composite membrane without PAMAM. In addition, efficient separation efficiency and high selectivity of the gas separation process were observed. The separation factors of the PPCm for CO2/H2 and CO2/N2 were about three times higher than that of the PVA/Cu2+ substrate membranes. These results suggested that the introduction of PAMAM was promising for CO2 separation and permeation.

A poly(arylene ether sulfone) hybrid membrane using titanium dioxide nanoparticles as the filler

2016 ◽  
Vol 29 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Yunwu Yu ◽  
Wenhao Pan ◽  
Xiaoman Guo ◽  
Lili Gao ◽  
Yaxin Gu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Dioxide ◽  
Gas Separation ◽  
Proton Nuclear Magnetic Resonance ◽  
Separation Performance ◽  
Hydroxyl Groups ◽  
Hybrid Membranes ◽  
Permeability Coefficients ◽  
Arylene Ether ◽  
The Matrix

Poly(arylene ether sulfone) (PES)–titanium dioxide (TiO2) hybrid membranes were prepared via solution blending method using TiO2 nanoparticles as inorganic filler. The chemical structure and thermal stability of the matrix polymer were characterized by proton nuclear magnetic resonance, Fourier transform infrared, differential scanning calorimetry, and thermogravimetric analysis. The crystal structure, morphology, mechanical properties, and gas separation performance of hybrid membranes were characterized in detail. As shown in scanning electron microscopic images, TiO2 nanoparticles dispersed homogeneously in the matrix. Although the mechanical properties of hybrid membranes decreased certainly compared to the pure PES membranes, they are strong enough for gas separation in this study. All gas permeability coefficients of PES-TiO2 hybrid membranes were higher than pure PES membranes, attributed to the nanogap caused by TiO2 nanoparticles, for instance, oxygen and nitrogen permeability coefficients of Hybrid-3 (consists of PES with 4-amino-phenyl pendant group and hexafluoroisopropyl (Am-PES)-20 and TiO2 nanoparticles, 5 wt%) increased from 2.57 and 0.33 to 5.88 and 0.63, respectively. In addition, the separation factor increased at the same time attributed to the stimulative transfer effect caused by the interaction of hydroxyl groups on the TiO2 nanoparticle and polar carbon dioxide molecules.

scholarly journals POLYSULFONE MEMBRANE WITH ZEOLITE FILLER FOR CO2/CH4 GAS SEPARATION: A REVIEW

2019 ◽  
Vol 1 (1) ◽  
pp. 10
Author(s):  
Indri Susanti
Keyword(s):  
Gas Separation ◽  
High Selectivity ◽  
Membrane Technology ◽  
Mixed Matrix Membrane ◽  
Co2 Separation ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Polysulfone Membrane ◽  
Trade Off ◽  
Review Mechanism

Membrane technology for gas separation applications are limited by a "trade-off" curve between permeability and selectivity. It show that permeability is high, selectivity obtained is low. This problem can be solved by preparation of Mixed-Matrix Membrane (MMMs) which can increase the value of permeability and selectivity. The MMMs with polysulfone polymers and zeolite fillers is more corresponding for gas separation. Addition of zeolite filler to polysulfone polymer in MMMs can improve the CO2 separation performance. In this review, mechanism of gas separation in MMMs was carried out in the application of CO2/CH4 gas separation. In addition, the effect of addition, size and pore of zeolite filler in MMMs for binary gas separation were also discussed in this review.

Evaluation of the Permeation of O2, Co2 and Water Vapor in Membranes of Polyetherimide/Clay National Nanocomposites

2012 ◽  
Vol 727-728 ◽  
pp. 1570-1573
Author(s):  
Vanessa Nóbrega Medeiros ◽  
Amanda Melissa Damião Leite ◽  
Renê Anísio da Paz ◽  
Edcleide Maria Araujo ◽  
Luiz Antônio Pessan
Keyword(s):  
Water Vapor ◽  
Gas Separation ◽  
Polymer Matrix ◽  
High Selectivity ◽  
Membrane Separation ◽  
Gas Permeability ◽  
Bentonite Clay ◽  
Separation Process ◽  
Nanometric Particles ◽  
Cryogenic Distillation

The membrane separation process, although is recently, is increasing in applications such as purification, fractioning and concentration of substances in several industries. The membranes to gas separation present specific advantages when compared with conventional separation process (such as, cryogenic distillation and adsorption). Composite membrane has been widely applied in gas separation. The interest in the nanotechnology development in the last decade allows the increase in the nanocomposite area due to the special properties presented by these materials. In the nanocomposite the nanometric particles are dispersed in the polymer matrix. The polymer matrix used in this work was a polyetherimide (PEI), which is the most popular polymers for the preparation of membrane due to its solvent resistance and high selectivity. These membranes were obtained from polyetherimide (PEI) with bentonite clay from Paraiba/Brazil, by solvent evaporation method, and applied to gas permeability. The membranes were characterized by permeability to O2, CO2and water vapor. The results present in this study show good expectation.

scholarly journals Experimental Investigation of the Gas/Liquid Phase Separation Using a Membrane-Based Micro Contactor

2018 ◽  
Vol 2 (4) ◽  
pp. 55 ◽  
Author(s):  
Kay Marcel Dyrda ◽  
Vincent Wilke ◽  
Katja Haas-Santo ◽  
Roland Dittmeyer
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Pressure Gradient ◽  
Separation Efficiency ◽  
Gas Permeability ◽  
Separation Process ◽  
Methanol Solution ◽  
Liquid Phase Separation ◽  
Separation Performance ◽  
Membrane Area

The gas/liquid phase separation of CO2 from a water-methanol solution at the anode side of a µDirect-Methanol-Fuel-Cell (µDMFC) plays a key role in the overall performance of fuel cells. This point is of particular importance if the µDMFC is based on a “Lab-on-a-Chip” design with transient working behaviour, as well as with a recycling and a recovery system for unused fuel. By integrating a membrane-based micro contactor downstream into the µDMFC, the efficient removal of CO2 from a water-methanol solution is possible. In this work, a systematic study of the separation process regarding gas permeability with and without two-phase flow is presented. By considering the µDMFC working behaviour, an improvement of the overall separation performance is pursued. In general, the gas/liquid phase separation is achieved by (1) using a combination of the pressure gradient as a driving force, and (2) capillary forces in the pores of the membrane acting as a transport barrier depending on the nature of it (hydrophilic/hydrophobic). Additionally, the separation efficiency, pressure gradient, orientation, liquid loss, and active membrane area for different feed inlet temperatures and methanol concentrations are investigated to obtain an insight into the separation process at transient working conditions of the µDMFC.

Effects of Curing Method on the Gas Separation Performance of Phenolic Resin/Poly(vinyl Alcohol)-Based Carbon Membrane Materials

2011 ◽  
Vol 675-677 ◽  
pp. 1185-1188
Author(s):  
Bing Zhang ◽  
Yong Hong Wu ◽  
Tong Hua Wang ◽  
Jie Shan Qiu ◽  
Tie Jun Xu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Gas Separation ◽  
Vinyl Alcohol ◽  
Phenolic Resin ◽  
Poly Vinyl Alcohol ◽  
Separation Performance ◽  
Carbon Membrane ◽  
Carbon Membranes ◽  
Curing Methods ◽  
Gas Separation Performance

A novel cheap blended precursor phenolic resin/poly(vinyl alcohol) (PR/PVA) was developed to prepare carbon membranes. The effect of two curing methods (i.e., crosslinker and preoxidation) on the gas separation performance of their derived carbon membranes was investigated. Thermogravimetric analysis (TGA), Differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy were used to analyze the thermal stability of precursor and the changes in functional groups on membrane surface. The gas permeation of carbon membranes was tested for H2 and N2. The results show that PR, PR/PVA, and two PR/PVA cured samples have three thermal degradation stages. The thermal stability for original PR/PVA membrane is significantly improved via the method of preoxidation or crosslinker. Similar crosslinking structure is formed by the two curing methods. However, carbon membranes from crosslinker method present two-fold higher in hydrogen permeability and four-fold higher in selectivity than that from preoxidation method.

scholarly journals Interfacial Design of Mixed Matrix Membranes via Grafting PVA on UiO-66-NH2 to Enhance the Gas Separation Performance

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 419
Author(s):  
Saeed Ashtiani ◽  
Mehdi Khoshnamvand ◽  
Chhabilal Regmi ◽  
Karel Friess
Keyword(s):  
Gas Separation ◽  
Reversible Reaction ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Poly Vinyl Alcohol ◽  
Separation Performance ◽  
Strong Impact ◽  
Mixed Matrix ◽  
Cross Sectional ◽  
Covalent Interaction

In this study, defect-free facilitated transport mixed matrix membrane (MMM) with high loading amount of UiO-66-NH2 nanoparticles as metal–organic frameworks (MOFs) was fabricated. The MOFs were covalently bonded with poly (vinyl alcohol) (PVA) to incorporate into a poly (vinyl amine) (PVAm) matrix solution. A uniform UiO-66-NH2 dispersion up to 55 wt.% was observed without precipitation and agglomeration after one month. This can be attributed to the high covalent interaction at interfaces of UiO-66-NH2 and PVAm, which was provided by PVA as a functionalized organic linker. The CO2 permeability and CO2/N2 and selectivity were significantly enhanced for the fabricated MMM by using optimal fabrication parameters. This improvement in gas performance is due to the strong impact of solubility and decreasing diffusion in obtained dense membrane to promote CO2 transport with a bicarbonate reversible reaction. Therefore, the highest amount of amine functional groups of PVAm among all polymers, plus the abundant amount of amines from UiO-66-NH2, facilitated the preferential CO2 permeation through the bicarbonate reversible reaction between CO2 and –NH2 in humidified conditions. XRD and FTIR were employed to study the MMM chemical structure and polymers–MOF particle interactions. Cross-sectional and surface morphology of the MMM was observed by SEM-EDX and 3D optical profilometer to detect the dispersion of MOFs into the polymer matrix and explore their interfacial morphology. This approach can be extended for a variety of polymer–filler interfacial designs for gas separation applications.

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