Synthesis and Formation of Gas Separation Membranes Based on Polyalkylenesiloxanes

2019 ◽  
Vol 816 ◽  
pp. 233-237
Author(s):  
Ilya L. Borisov ◽  
N.V. Ushakov ◽  
E.A. Grushevenko ◽  
E.S. Finkel’stein ◽  
V.V. Volkov
Keyword(s):  
Gas Separation ◽  
Separation Process ◽  
Membrane Gas Separation ◽  
Gas Separation Membrane ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Gas Transport Properties ◽  
Separation Membrane ◽  
Transport Component ◽  
The Ideal

The membrane gas separation is currently a competitive separation process. The heart of the membrane gas separation process is the membrane, more precisely the material from which it is made. The search for a selective material to develop a gas separation membrane is an important task presently. Membrane materials with advantageous impact of sorption transport component is a good material for the selective fractionating С1-С4 hydrocarbons with obtaining methane fraction and C3+ fraction. Such materials are polyalkylenesiloxanes. In this work, the optimal concentration of a curing agent (tetraethoxysilane) was defined (5%). Such concentration is necessary for obtaining constant membrane film with high gas transport properties: the permeability coefficient for n-butane is 7400; the ideal selectivity of n-butane/methane is 25.5.

scholarly journals Gas Separation Membranes upon Production of Functional Berry Juice

2019 ◽  
Vol 9 (1) ◽  
pp. 6616-6619
Keyword(s):  
Ascorbic Acid ◽  
Gas Separation ◽  
Biologically Active ◽  
Juice Quality ◽  
Active Components ◽  
Gas Separation Membrane ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Separation Membrane ◽  
New Generation

Nowadays manufacturing of new-generation food, including functional products, is especially important. Drinks based on fruits and berries are considered at present as optimum form of food required for organism replenishment with biologically active components and vitamins aiming at organism recovery. The retention of valuable components of fruits and berries is of great concern during such production. In order to produce functional juices, it is required to decrease oxygen amount upon their production in order to prevent destructive changes in drink, to improve its quality, to perform subsequent procedures and preservation. It is proposed to modify deaeration and to apply advanced equipment: deaerator with gas separation membrane which would allow to remove higher oxygen amount in comparison with the existing equipment while producing juices of predefined quality with high content of vitamins. The experiments were carried out with freshly squeezed black current juices using a vacuum unit, an Expert-009 analyzer of dissolved oxygen with optical sensor, a gas separation membrane. The juice quality was determined by its content of ascorbic acid (vitamin C) since it is destroyed under impact of oxygen. The content of ascorbic acid during storage was measured on juices produced by different deaeration procedures. The obtained experimental results proved efficiency of membrane application during juice production showing high content of vitamins. The content of ascorbic acid during storage was higher in the juice after deaeration using gas separation membrane in comparison with the juice without treatment and with the juice after vacuum deaeration. Therefore, the most efficient method to achieve the best removal of oxygen from juice is preheating of juice to 65°C with subsequent application of deaerator with gas separation membrane, subsequent packing and cooling of final product.

Thermally rearranged (TR) bismaleimide-based network polymers for gas separation membranes

2016 ◽  
Vol 52 (93) ◽  
pp. 13556-13559 ◽  
Author(s):  
Yu Seong Do ◽  
Won Hee Lee ◽  
Jong Geun Seong ◽  
Ju Sung Kim ◽  
Ho Hyun Wang ◽  
...  
Keyword(s):  
Transport Properties ◽  
Gas Separation ◽  
Gas Transport ◽  
Polymer Membranes ◽  
Interpenetrating Networks ◽  
Network Polymers ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Gas Transport Properties ◽  
First Time

Highly permeable thermally rearranged polymer membranes based on bismaleimide derivatives are reported for the first time. The membranes form semi-interpenetrating networks with other polymers endowing them with superior gas transport properties.

scholarly journals Perfluorodioxolane Polymers for Gas Separation Membrane Applications

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 394
Author(s):  
Yoshiyuki Okamoto ◽  
Hao-Chun Chiang ◽  
Minfeng Fang ◽  
Michele Galizia ◽  
Tim Merkel ◽  
...  
Keyword(s):  
Gas Separation ◽  
Optical Transmission ◽  
Chemical Resistance ◽  
State Of The Art ◽  
Gas Separation Membrane ◽  
Gas Transport Properties ◽  
Separation Membrane ◽  
Thermal And Oxidative Stability ◽  
Review State ◽  
Liquid Separations

Since the discovery of polytetrafluoroethylene (PTFE) in 1938, fluorinated polymers have drawn attention in the chemical and pharmaceutical field, as well as in optical and microelectronics applications. The reasons for this attention are their high thermal and oxidative stability, excellent chemical resistance, superior electrical insulating ability, and optical transmission properties. Despite their unprecedented combination of desirable attributes, PTFE and copolymers of tetrafluoroethylene (TFE) with hexafluoropropylene and perfluoropropylvinylether are crystalline and exhibit poor solubility in solvents, which makes their processability very challenging. Since the 1980s, several classes of solvent-soluble amorphous perfluorinated polymers showing even better optical and gas transport properties were developed and commercialized. Amorphous perfluoropolymers exhibit, however, moderate selectivity in gas and liquid separations. Recently, we have synthesized various new perfluorodioxolane polymers which are amorphous, soluble, chemically and thermally stable, while exhibiting much enhanced selectivity. In this article, we review state-of-the-art and recent progress in these perfluorodioxolane polymers for gas separation membrane applications.

scholarly journals Synthesis and Performance of Aromatic Polyamide Ionenes as Gas Separation Membranes

Membranes ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 51 ◽  
Author(s):  
Kathryn E. O’Harra ◽  
Irshad Kammakakam ◽  
Danielle M. Noll ◽  
Erika M. Turflinger ◽  
Grayson P. Dennis ◽  
...  
Keyword(s):  
Thin Films ◽  
Ionic Liquid ◽  
Gas Separation ◽  
Thermophysical Properties ◽  
Aromatic Polyamide ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Gas Transport Properties ◽  
Flexible Film ◽  
And Performance

Here, we report the synthesis and thermophysical properties of seven primarily aromatic, imidazolium-based polyamide ionenes. The effects of varied para-, meta-, and ortho-connectivity, and spacing of ionic and amide functional groups, on structural and thermophysical properties were analyzed. Suitable, robust derivatives were cast into thin films, neat, or with stoichiometric equivalents of the ionic liquid (IL) 1-benzy-3-methylimidazolium bistriflimide ([Bnmim][Tf2N]), and the gas transport properties of these membranes were measured. Pure gas permeabilities and permselectivities for N2, CH4, and CO2 are reported. Consistent para-connectivity in the backbone was shown to yield the highest CO2 permeability and suitability for casting as a very thin, flexible film. Derivatives containing terephthalamide segments exhibited the highest CO2/CH4 and CO2/N2 selectivities, yet CO2 permeability decreased with further deviation from consistent para-linkages.

scholarly journals Mitigating the Agglomeration of Nanofiller in a Mixed Matrix Membrane by Incorporating an Interface Agent

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 328
Author(s):  
Manh-Tuan Vu ◽  
Gloria M. Monsalve-Bravo ◽  
Rijia Lin ◽  
Mengran Li ◽  
Suresh K. Bhatia ◽  
...  
Keyword(s):  
Gas Separation ◽  
Polymer Matrix ◽  
Ion Beam ◽  
High Surface ◽  
Mixed Matrix Membrane ◽  
Mechanical And Thermal Properties ◽  
Separation Membranes ◽  
Surface Areas ◽  
Separation Membrane ◽  
Focus Ion Beam

Nanodiamonds (ND) have recently emerged as excellent candidates for various applications including membrane technology due to their nanoscale size, non-toxic nature, excellent mechanical and thermal properties, high surface areas and tuneable surface structures with functional groups. However, their non-porous structure and strong tendency to aggregate are hindering their potential in gas separation membrane applications. To overcome those issues, this study proposes an efficient approach by decorating the ND surface with polyethyleneimine (PEI) before embedding it into the polymer matrix to fabricate MMMs for CO2/N2 separation. Acting as both interfacial binder and gas carrier agent, the PEI layer enhances the polymer/filler interfacial interaction, minimising the agglomeration of ND in the polymer matrix, which is evidenced by the focus ion beam scanning electron microscopy (FIB-SEM). The incorporation of PEI into the membrane matrix effectively improves the CO2/N2 selectivity compared to the pristine polymer membranes. The improvement in CO2/N2 selectivity is also modelled by calculating the interfacial permeabilities with the Felske model using the gas permeabilities in the MMM. This study proposes a simple and effective modification method to address both the interface and gas selectivity in the application of nanoscale and non-porous fillers in gas separation membranes.

Metal-induced microporous aminosilica creates a highly permeable gas-separation membrane

2021 ◽  
Author(s):  
Ufafa Anggarini ◽  
Toshinori Tsuru ◽  
Masakoto Kanezashi ◽  
Hiroki Nagasawa ◽  
Liang Yu
Keyword(s):  
Gas Separation ◽  
Gas Separation Membrane ◽  
Separation Membrane

Hybrid microporous aminosilica membranes have been successfully synthesized via doping with Ag-, Cu- and Ni- into dense bis [3-(trimethoxysilyl) propyl] amine (BTPA) membranes, which creates micropores via the crosslinking between...

MXene-based gas separation membranes with sorption type selectivity

2021 ◽  
Vol 621 ◽  
pp. 118994
Author(s):  
D.I. Petukhov ◽  
A.S. Kan ◽  
A.P. Chumakov ◽  
O.V. Konovalov ◽  
R.G. Valeev ◽  
...  
Keyword(s):  
Gas Separation ◽  
Separation Membranes ◽  
Gas Separation Membranes
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