scholarly journals Development of Novel Polyamide-Imide/DES Composites and Their Application for Pervaporation and Gas Separation

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 990
Author(s):  
Alexandra Pulyalina ◽  
Valeriia Rostovtseva ◽  
Ilya Faykov ◽  
Maksim Tataurov ◽  
Roman Dubovenko ◽  
...  
Keyword(s):  
Gas Separation ◽  
Deep Eutectic Solvent ◽  
Contact Angles ◽  
Separation Performance ◽  
X Ray Diffraction ◽  
Alcohol Dehydration ◽  
Separation Processes ◽  
Surface Character ◽  
Membrane Methods

Novel polymer composites based on polyamide–imide Torlon and deep eutectic solvent (DES) were fabricated and adapted for separation processes. DES composed of zinc chloride and acetamide in a ratio of 1:3 M was first chosen as a Torlon-modifier due to the possibility of creating composites with a uniform filling of the DES through the formation of hydrogen bonds. The structure of the membranes was investigated by scanning electron microscopy and X-ray diffraction analysis; thermal stability was determined by thermogravimetric analysis and mass spectrometry. The surface of the composites was studied by determining the contact angles and calculating the surface tension. The transport properties were investigated by such membrane methods as pervaporation and gas separation. It was found that the inclusion of DES in the polymer matrix leads to a significant change in the structure and surface character of composites. It was also shown that DES plays the role of a plasticizer and increases the separation performance in the separation of liquids and gases. Torlon/DES composites with a small amount of modifier were effective in alcohol dehydration, and were permeable predominantly to water impurities in isopropanol. Torlon/DES-5 demonstrates high selectivity in the gas separation of O2/N2 mixture.

scholarly journals Poly(ether- block -amide) copolymer membrane for CO 2 /N 2 separation: the influence of the casting solution concentration on its morphology, thermal properties and gas separation performance

2019 ◽  
Vol 6 (9) ◽  
pp. 190866 ◽  
Author(s):  
Lidia Martínez-Izquierdo ◽  
Magdalena Malankowska ◽  
Javier Sánchez-Laínez ◽  
Carlos Téllez ◽  
Joaquín Coronas
Keyword(s):  
Gas Separation ◽  
Solution Concentration ◽  
Polymer Chains ◽  
Separation Performance ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Crystalline Materials ◽  
Casting Solution ◽  
Feed Pressure ◽  
Gas Separation Performance

The present work is focused on the study of the effect that the casting solution concentration has on the morphology and gas separation performance of poly(ether- block -amide) copolymer membranes (Pebax ® MH 1657). With this aim, three different concentrations of Pebax ® MH 1657 in the casting solution (1, 3 and 5 wt%) were used to prepare dense membranes with a thickness of 40 µm. The morphology and thermal stability of all membranes were characterized by scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, rotational viscometry and thermogravimetric analyses. An increase in crystallinity was notable when the amount of solvent in the Pebax ® MH 1657 solution was higher, mainly related to the polymer chains arrangement and the solvent evaporation time. Such characteristic seemed to play a key role in the thermal degradation of the membranes, confirming that the most crystalline materials tend to be thermally more stable than those with lower crystallinity. To study the influence of their morphology and operating temperature on the CO 2 separation, gas separation tests were conducted with the gas mixture CO 2 /N 2 . Results indicated that a compromise must be found between the amount of solvent used to prepare the membranes and the crystallinity, in order to reach the best gas separation performance. In this study, the best performance was achieved with the membrane prepared from a 3 wt% casting solution, reaching at 35°C and under a feed pressure of 3 bar, a CO 2 permeability of 110 Barrer and a CO 2 /N 2 selectivity of 36.

scholarly journals Molecular Weight and Gas Separation Performance of Polyimide Membrane: Insight into Role of Imidization Route

2020 ◽  
Vol 24 (3) ◽  
Author(s):  
P. C. Tan ◽  
D. Y. Yiauw ◽  
G. H. Teoh ◽  
S. C. Low ◽  
Z. A. Jawad
Keyword(s):  
Molecular Weight ◽  
Gas Separation ◽  
Separation Performance ◽  
Synthesis Conditions ◽  
Polyimide Membrane ◽  
Gas Transport Properties ◽  
Thermal Imidization ◽  
Insight Into ◽  
Gas Separation Performance

Various methods have been explored to improve the gas separation performance of polyimide membrane for more viable industrial commercialization. Generally, polyimide membrane can be synthesized via two different methods: chemical imidization and thermal imidization routes. Due to the markedly different membrane synthesis conditions, the influence of imidization methods on the gas transport properties of resulting membrane is worthy of investigation. The polyimide produced from two imidization methods was characterized for its molecular weight. In overall, the molecular weight of thermally imidized polyimide was higher than that of chemically imidized one except ODPA-6FpDA:DABA as it was prone to depropagation at high temperature. It was observed that the chemically imidized ODPA-6FpDA:DABA membrane possessed better gas separation performance than the thermally imidized counterpart. In particular, it showed 12 times higher CO2 permeability (19.21 Barrer) with CO2/N2 selectivity of 5. After crosslinking, the CO2/N2 selectivity of the polyimide membrane was further improved to 11.8 at 6 bar of permeation pressure.

The role of geometrically different carbon-based fillers on the formation and gas separation performance of nanocomposite membranes

Carbon ◽  
2019 ◽  
Vol 149 ◽  
pp. 33-44 ◽  
Author(s):  
Kar Chun Wong ◽  
Pei Sean Goh ◽  
Takaaki Taniguchi ◽  
Ahmad Fauzi Ismail ◽  
Khalisah Zahri
Keyword(s):  
Gas Separation ◽  
Separation Performance ◽  
Nanocomposite Membranes ◽  
Gas Separation Performance ◽  
Carbon Based

scholarly journals Poly[3-ethyl-1-vinyl-imidazolium] diethyl phosphate/Pebax® 1657 Composite Membranes and Their Gas Separation Performance

Membranes ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 224
Author(s):  
Irene R. Mazzei ◽  
Daria Nikolaeva ◽  
Alessio Fuoco ◽  
Sandrine Loïs ◽  
Sébastien Fantini ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Transport ◽  
Time Lag ◽  
Composite Membranes ◽  
Industrial Applications ◽  
Mechanical Resistance ◽  
Separation Performance ◽  
Separation Processes ◽  
Neat Polymer ◽  
Diethyl Phosphate

Poly(ionic liquid)s are an innovative class of materials with promising properties in gas separation processes that can be used to boost the neat polymer performances. Nevertheless, some of their properties such as stability and mechanical strength have to be improved to render them suitable as materials for industrial applications. This work explored, on the one hand, the possibility to improve gas transport and separation properties of the block copolymer Pebax® 1657 by blending it with poly[3-ethyl-1-vinyl-imidazolium] diethyl phosphate (PEVI-DEP). On the other hand, Pebax® 1657 served as a support for the PIL and provided mechanical resistance to the samples. Pebax® 1657/PEVI-DEP composite membranes containing 20, 40, and 60 wt.% of PEVI-DEP were cast from solutions of the right proportion of the two polymers in a water/ethanol mixture. The PEVI-DEP content affected both the morphology of the dense membranes and gas transport through the membranes. These changes were revealed by scanning electron microscopy (SEM), time-lag, and gravimetric sorption measurements. Pebax® 1657 and PEVI-DEP showed similar affinity towards CO2, and its uptake or solubility was not influenced by the amount of PIL in the membrane. Therefore, the addition of the PIL did not lead to improvements in the separation of CO2 from other gases. Importantly, PEVI-DEP (40 wt.%) incorporation affected and improved permeability and selectivity by more than 50% especially for the separation of light gases, e.g., H2/CH4 and H2/CO2, but higher PEVI-DEP concentrations lead to a decline in the transport properties.

scholarly journals Surface Modifications of Nanofillers for Carbon Dioxide Separation Nanocomposite Membrane

Symmetry ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1102
Author(s):  
Pei Sean Goh ◽  
Kar Chun Wong ◽  
Lukka Thuyavan Yogarathinam ◽  
Ahmad Fauzi Ismail ◽  
Mohd Sohaimi Abdullah ◽  
...  
Keyword(s):  
Surface Modification ◽  
Gas Separation ◽  
Wide Spectrum ◽  
Economic Benefits ◽  
Co2 Separation ◽  
Separation Performance ◽  
Nanocomposite Membranes ◽  
Separation Processes ◽  
Carbon Dioxide Separation ◽  
Surface Modified

CO2 separation is an important process for a wide spectrum of industries including petrochemical, refinery and coal-fired power plant industries. The membrane-based process is a promising operation for CO2 separation owing to its fundamental engineering and economic benefits over the conventionally used separation processes. Asymmetric polymer–inorganic nanocomposite membranes are endowed with interesting properties for gas separation processes. The presence of nanosized inorganic nanofiller has offered unprecedented opportunities to address the issues of conventionally used polymeric membranes. Surface modification of nanofillers has become an important strategy to address the shortcomings of nanocomposite membranes in terms of nanofiller agglomeration and poor dispersion and polymer–nanofiller incompatibility. In the context of CO2 gas separation, surface modification of nanofiller is also accomplished to render additional CO2 sorption capacity and facilitated transport properties. This article focuses on the current strategies employed for the surface modification of nanofillers used in the development of CO2 separation nanocomposite membranes. A review based on the recent progresses made in physical and chemical modifications of nanofiller using various techniques and modifying agents is presented. The effectiveness of each strategy and the correlation between the surface modified nanofiller and the CO2 separation performance of the resultant nanocomposite membranes are thoroughly discussed.

scholarly journals The Phase Structural Evolution and Gas Separation Performances of Cellulose Acetate/Polyimide Composite Membrane from Polymer to Carbon Stage

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 618
Author(s):  
Haojie Li ◽  
Shan Xu ◽  
Bingyu Zhao ◽  
Yuxiu Yu ◽  
Yaodong Liu
Keyword(s):  
Heat Treatment ◽  
Cellulose Acetate ◽  
Gas Separation ◽  
Gas Permeability ◽  
Structural Evolution ◽  
Gas Diffusion ◽  
Separation Performance ◽  
Membrane Structures ◽  
Separation Performances

Blending and heat-treatment play significant roles in adjusting gas separation performances of membranes, especially for incorporating thermally labile polymers into carbon molecular sieve membranes (CMSMs). In this work, cellulose acetate (CA) is introduced into polyimide (PI) as a sacrificial phase to adjust the structure and gas separation performance from polymer to carbon. A novel result is observed that the gas permeability is reduced, even when the immiscible CA phase decomposes and forms pores after heat treatment at 350 °C. After carbonization at 600 °C, the miscible CA has changed without contribution, while the role of the immiscible CA phase has changed from original hindrance to facilitation, the composite-based CMSM at a CA content of 10 wt.% shows highest performances, a H2 permeability of ~5300 Barrer (56% enhancement) with a similar H2/N2 permselectivity of 42. The structural analyses reveal that the chain interactions and phase separation behaviors between CA and PI play critical roles on membrane structures and gas diffusion, and the corresponding phase structural evolutions during heat treatment and carbonization determine gas separation properties.

scholarly journals In situ Synthesis of ZIF-8 Membranes with Gas Separation Performance in a Deep Eutectic Solvent

2016 ◽  
Vol 32 (6) ◽  
pp. 1495-1500 ◽  
Author(s):  
Xiao-Lei LI ◽  
◽  
Shuo TAO ◽  
Ke-Da LI ◽  
Ya-Song WANG ◽  
...  
Keyword(s):  
Gas Separation ◽  
Deep Eutectic Solvent ◽  
Separation Performance ◽  
Gas Separation Performance
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