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1. Matrimid® derived carbon molecular sieve hollow fiber membranes for ethylene/ethane separation

Author:
Xu, Liren; Rungta, Meha; Koros, William J.
Source:
Journal of membrane science 2011 v.380 no.1-2 pp. 138-147
ISSN:
0376-7388
Subject:
artificial membranes; carbon; engineering; ethane; ethylene; glass transition temperature; heat treatment; polymers; scanning electron microscopy
Abstract:
... Carbon molecular sieve (CMS) membranes have shown promising separation performance compared to conventional polymeric membranes. Translating the very attractive separation properties from dense films to hollow fibers is important for applying CMS materials in realistic gas separations. The very challenging ethylene/ethane separation is the primary target of this work. Matrimid® derived CMS hollow ...
DOI:
10.1016/j.memsci.2011.06.037

2. Effect of zeolitic imidazolate frameworks on the gas transport performance of ZIF8-poly(1,4-phenylene ether-ether-sulfone) hybrid membranes

Author:
Díaz, Kenya; López-González, Mar; del Castillo, Luis F.; Riande, Evaristo
Source:
Journal of membrane science 2011 v.383 no.1-2 pp. 206-213
ISSN:
0376-7388
Subject:
activation energy; artificial membranes; carbon dioxide; diffusivity; ethane; ethylene; gases; glass transition temperature; hydrogen; methane; nitrogen; oxygen; permeability; polymers
Abstract:
... This work reports the permeability of hydrogen, nitrogen, oxygen, carbon dioxide, methane, ethane and ethylene across ZIF-8/poly(1,4-phenylen ether-ether-sulfone) hybrid membranes containing 0, 0.10, 0.20 and 0.30 weight fractions of ZIF-8. The glass transition temperature is independent on the filler content suggesting that the filler does not affect the polymer chains mobility. The study was car ...
DOI:
10.1016/j.memsci.2011.08.042

3. Olefins-selective asymmetric carbon molecular sieve hollow fiber membranes for hybrid membrane-distillation processes for olefin/paraffin separations

Author:
Xu, Liren; Rungta, Meha; Brayden, Mark K.; Martinez, Marcos V.; Stears, Brien A.; Barbay, Gregory A.; Koros, William J.
Source:
Journal of membrane science 2012 v.423-424 pp. 314-323
ISSN:
0376-7388
Subject:
artificial membranes; carbon; energy conservation; ethane; ethylene; olefin; polymers; propane; propylene; spinning
Abstract:
... In this paper, the development of asymmetric carbon molecular sieve (CMS) hollow fiber membranes and advanced processes for olefin/paraffin separations based on the CMS membranes are reported. Membrane-based olefin/paraffin separations have been pursued extensively over the past decades. CMS membranes are promising to exceed the performance upper bound of polymer materials and have demonstrated ex ...
DOI:
10.1016/j.memsci.2012.08.028

4. Silver salt facilitated transport membranes for olefin/paraffin separations: Carrier instability and a novel regeneration method

Author:
Merkel, Timothy C.; Blanc, Rolande; Ciobanu, Isabelle; Firat, Bilgen; Suwarlim, Adeline; Zeid, Joumana
Source:
Journal of membrane science 2013 v.447 pp. 177-189
ISSN:
0376-7388
Subject:
acetylene; artificial membranes; ethane; ethylene; hydrogen; hydrogen sulfide; ions; olefin; polymers; silver; vapors
Abstract:
... Facilitated transport membranes have been the subject of continuing study in the membrane gas separation field for over 50 years. Despite laboratory performance that far exceeds the polymer upper bound for many gas pairs, facilitated transport membranes have failed to achieve commercial success. This failure is in part due to instability of the carrier species that are responsible for the facilita ...
DOI:
10.1016/j.memsci.2013.07.010

5. Temperature dependence of gas sorption and permeation in PIM-1

Author:
Li, P.; Chung, T.S.; Paul, D.R.
Source:
Journal of membrane science 2014 v.450 pp. 380-388
ISSN:
0376-7388
Subject:
artificial membranes; carbon dioxide; diffusivity; ethane; ethylene; gases; hydrogen; methane; models; oxygen; polymers; sorption; sorption isotherms; temperature
Abstract:
... In a prior paper gas sorption, permeation and diffusion coefficients were determined for He, H2, N2, O2, CH4, CO2, C2H4, C2H6, C3H6 and C3H8 in PIM-1, a polymer of intrinsic microporosity, at 25°C over a range of pressures. Here similar measurements and analyses were made at temperatures from 25 to 55°C over a wide range of pressure. In all cases, the sorption isotherms were generally consistent w ...
DOI:
10.1016/j.memsci.2013.09.030

6. Physical aging and plasticization of thick and thin films of the thermally rearranged ortho-functional polyimide 6FDA–HAB

Author:
Wang, Huan; Chung, Tai-Shung; Paul, Donald R.
Source:
Journal of membrane science 2014 v.458 pp. 27-35
ISSN:
0376-7388
Subject:
artificial membranes; carbon dioxide; chronic exposure; ethane; ethylene; films (materials); gases; permeability; polymers; temperature
Abstract:
... It was recently shown that the rate of the thermal rearrangement process of an ortho-functional polyimide is thickness dependent. Here it is shown that the gas separation properties of thermally rearranged (TR) polymer films are also affected by thickness. In this work, the physical aging and plasticization behavior of TR polymers were tracked using thin (~1–2μm) and thick (~15–20μm) films derived ...
DOI:
10.1016/j.memsci.2014.01.066

7. Relationship between long-range diffusion and diffusion in the ZIF-8 and polymer phases of a mixed-matrix membrane by high field NMR diffusometry

Author:
Mueller, Robert; Zhang, Suihua; Zhang, Chen; Lively, Ryan; Vasenkov, Sergey
Source:
Journal of membrane science 2015 v.477 pp. 123-130
ISSN:
0376-7388
Subject:
artificial membranes; diffusivity; ethylene; magnetic fields; models; nuclear magnetic resonance spectroscopy; polymers
Abstract:
... Pulsed field gradient (PFG) NMR is applied to resolve different modes of ethene self-diffusion inside a mixed-matrix membrane (MMM) consisting of ZIF-8 particles embedded in 6FDA–DAM polymer: (i) diffusion inside the ZIF-8 particles, (ii) diffusion inside the surrounding polymer matrix, and (iii) diffusion under conditions of an exchange between the particles and the polymer over length scales sma ...
DOI:
10.1016/j.memsci.2014.12.015

8. Relationship between mixed and pure gas self-diffusion for ethane and ethene in ZIF-8/6FDA-DAM mixed-matrix membrane by pulsed field gradient NMR

Author:
Mueller, Robert; Hariharan, Venkatachalam; Zhang, Chen; Lively, Ryan; Vasenkov, Sergey
Source:
Journal of membrane science 2016 v.499 pp. 12-19
ISSN:
0376-7388
Subject:
artificial membranes; diffusivity; ethane; ethylene; films (materials); gases; magnetic fields; nuclear magnetic resonance spectroscopy; polymers
Abstract:
... Pulsed field gradient (PFG) NMR was applied to study self-diffusion of an ethane/ethene mixture and the corresponding pure gases in a mixed-matrix membrane (MMM) formed by dispersing ZIF-8 particles in 6FDA-DAM polymer. In addition to the MMM, diffusion measurements of the pure gases were also carried out for the membrane constituents, i.e. ZIF-8 particle bed and the pure polymer film. PFG NMR stu ...
DOI:
10.1016/j.memsci.2015.10.036

9. High-performance carbon molecular sieve membranes for ethylene/ethane separation derived from an intrinsically microporous polyimide

Author:
Salinas, Octavio; Ma, Xiaohua; Litwiller, Eric; Pinnau, Ingo
Source:
Journal of membrane science 2016 v.500 pp. 115-123
ISSN:
0376-7388
Subject:
artificial membranes; carbon; diffusivity; ethane; ethylene; micropores; permeability; polymers; porous media; pyrolysis; solubility; sorption; temperature
Abstract:
... An intrinsically microporous polymer with hydroxyl functionalities, PIM-6FDA-OH, was used as a precursor for various types of carbon molecular sieve (CMS) membranes for ethylene/ethane separation. The pristine polyimide films were heated under controlled N2 atmosphere at different stages from 500 to 800°C. All CMS samples carbonized above 600°C surpassed the polymeric ethylene/ethane upper bound. ...
DOI:
10.1016/j.memsci.2015.11.013

10. Ethylene/ethane permeation, diffusion and gas sorption properties of carbon molecular sieve membranes derived from the prototype ladder polymer of intrinsic microporosity (PIM-1)

Author:
Salinas, Octavio; Ma, Xiaohua; Litwiller, Eric; Pinnau, Ingo
Source:
Journal of membrane science 2016 v.504 pp. 133-140
ISSN:
0376-7388
Subject:
artificial membranes; carbon; carbonization; crosslinking; dioxane; ethane; ethylene; heat treatment; moieties; oxygen; permeability; polymers; prototypes; pyrolysis; sieving; sorption; surface area; temperature
Abstract:
... Fine-tuning the microporosity of PIM-1 by heat treatment was applied to develop a suitable carbon molecular sieve membrane for ethylene/ethane separation. Pristine PIM-1 films were heated from 400 to 800°C under inert N2 atmosphere (<2ppm O2). At 400°C, PIM-1 self-cross-linked and developed polar carbonyl and hydroxyl groups due to partial dioxane splitting in the polymer backbone. Significant deg ...
DOI:
10.1016/j.memsci.2015.12.052

11. Ultra-thin MFI membranes for olefin/nitrogen separation

Author:
Yu, Liang; Grahn, Mattias; Ye, Pengcheng; Hedlund, Jonas
Source:
Journal of membrane science 2017 v.524 pp. 428-435
ISSN:
0376-7388
Subject:
adsorption; ambient temperature; artificial membranes; economic valuation; ethylene; heat; models; nitrogen; olefin; polymers; propylene; streams; zeolites
Abstract:
... The recovery of light hydrocarbons such as propylene and ethylene from vent streams in polymer plants is desirable since it opens up for more efficient conversion of the monomers with high economic value. Consequently, polymer membrane vapour-gas separation systems have been used for this purpose for decades [1,2]. However, an alternative is zeolite membranes. In this work, ultra-thin MFI zeolite ...
DOI:
10.1016/j.memsci.2016.11.077

12. Defect-free PIM-1 hollow fiber membranes

Author:
Jue, Melinda L.; Breedveld, Victor; Lively, Ryan P.
Source:
Journal of membrane science 2017 v.530 pp. 33-41
ISSN:
0376-7388
Subject:
activation energy; argon (noble gases); artificial membranes; carbon dioxide; ethane; ethylene; evaporation; helium; hydrogen; methane; nitrogen; oxygen; polymers; solvents; spinning; tetrahydrofuran
Abstract:
... A modified dual-bath method of spinning was employed to fabricate defect-free, integrally skinned, asymmetric PIM-1 hollow fiber membranes utilizing an immiscible liquid protective layer. Spinning techniques capable of addressing specific challenges presented by PIM-1 solutions are discussed. In particular, dual-bath spinning via a triple orifice spinneret circumvents the primary issue associated ...
DOI:
10.1016/j.memsci.2017.02.012

13. Boron-embedded hydrolyzed PIM-1 carbon membranes for synergistic ethylene/ethane purification

Author:
Liao, Kuo-Sung; Japip, Susilo; Lai, Juin-Yih; Chung, Tai-Shung
Source:
Journal of membrane science 2017 v.534 pp. 92-99
ISSN:
0376-7388
Subject:
additives; artificial membranes; boron; boron compounds; carbon; carbon dioxide; carbonization; diffusivity; ethane; ethylene; hydrolysis; molecular weight; permeability; polymers; porosity; sorption isotherms
Abstract:
... For the first time, boron embedded carbon membranes have shown superior C2H4 permeability and C2H4/C2H6 selectivity to the upper bound line under both pure and mixed gas tests. The precursors of the carbon membranes were prepared by incorporating various boron compounds with different molecular sizes into a hydrolyzed polymer of intrinsic microporosity (PIM-1) and then carbonized at 700°C. The inc ...
DOI:
10.1016/j.memsci.2017.04.017

14. Relationship between ethane and ethylene diffusion inside ZIF-11 crystals confined in polymers to form mixed-matrix membranes

Author:
Forman, Evan M.; Baniani, Amineh; Fan, Lei; Ziegler, Kirk J.; Zhou, Erkang; Zhang, Fengyi; Lively, Ryan P.; Vasenkov, Sergey
Source:
Journal of membrane science 2020 v.593 pp. 117440
ISSN:
0376-7388
Subject:
activation energy; adhesion; artificial membranes; crystals; diffusivity; ethane; ethylene; nuclear magnetic resonance spectroscopy; polymers; temperature
Abstract:
... Self-diffusivities of ethane were measured by multinuclear pulsed field gradient (PFG) NMR inside zeolitic imidazolate framework-11 (ZIF-11) crystals dispersed in several selected polymers to form mixed-matrix membranes (MMMs). These diffusivities were compared with the corresponding intracrystalline self-diffusivities in ZIF-11 crystal beds. It was observed that the confinement of ZIF-11 crystals ...
DOI:
10.1016/j.memsci.2019.117440