scholarly journals Hydrogen Recovery by Mixed Matrix Membranes Made from 6FCl-APAF HPA with Different Contents of a Porous Polymer Network and Their Thermal Rearrangement

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4343
Author(s):  
Cenit Soto ◽  
Edwin S. Torres-Cuevas ◽  
Alfonso González-Ortega ◽  
Laura Palacio ◽  
Pedro Prádanos ◽  
...  

Mixed matrix membranes (MMMs) consisting of a blend of a hydroxypolyamide (HPA) matrix and variable loads of a porous polymer network (PPN) were thermally treated to induce the transformation of HPA to polybenzoxazole (β-TR-PBO). Here, the HPA matrix was a hydroxypolyamide having two hexafluoropropyilidene moieties, 6FCl-APAF, while the PPN was prepared by reacting triptycene (TRP) and trifluoroacetophenone (TFAP) in a superacid solution. The most probable size of the PPN particles was 75 nm with quite large distributions. The resulting membranes were analyzed by SEM and AFM. Up to 30% PPN loads, both SEM and AFM images confirmed quite planar surfaces, at low scale, with limited roughness. Membranes with high hydrogen permeability and good selectivity for the gas pairs H2/CH4 and H2/N2 were obtained. For H2/CO2, selectivity almost vanished after thermal rearrangement. In all cases, their hydrogen permeability increased with increasing loads of PPN until around 30% PPN with ulterior fairly abrupt decreasing of permeability for all gases studied. Thermal rearrangement of the MMMs resulted in higher permeabilities but lower selectivities. For all the membranes and gas pairs studied, the balance of permeability vs. selectivity surpassed the 1991 Robeson’s upper bound, and approached or even exceeded the 2008 line, for MMMs having 30% PPN loads. In all cases, the HPA-MMMs before thermal rearrangement provided good selectivity versus permeability compromise, similar to their thermally rearranged counterparts but in the zone of high selectivity. For H2/CH4, H2/N2, these nonthermally rearranged MMMs approach the 2008 Robeson’s upper bound while H2/CO2 gives selective transport favoring H2 on the 1991 Robeson’s bound. Thus, attending to the energy cost of thermal rearrangement, it could be avoided in some cases especially when high selectivity is the target rather than high permeability.

2019 ◽  
Vol 58 (43) ◽  
pp. 20179-20179
Author(s):  
Carla Aguilar-Lugo ◽  
Fabián Suárez-García ◽  
Antonio Hernández ◽  
Jesús A. Miguel ◽  
Ángel E. Lozano ◽  
...  

Author(s):  
Carla Aguilar-Lugo ◽  
Won Hee Lee ◽  
Jesús A. Miguel ◽  
José G. de la Campa ◽  
Pedro Prádanos ◽  
...  

2015 ◽  
Vol 3 (12) ◽  
pp. 6549-6556 ◽  
Author(s):  
Javier Sánchez-Laínez ◽  
Beatriz Zornoza ◽  
Álvaro Mayoral ◽  
Ángel Berenguer-Murcia ◽  
Diego Cazorla-Amorós ◽  
...  

Nano-sized ZIF-11 with similar features to ZIF-11 has been used for the adsorption of H2 and CO2 and in the preparation of mixed matrix membranes for H2/CO2 separation.


2015 ◽  
Vol 486 ◽  
pp. 29-39 ◽  
Author(s):  
Sunghwan Park ◽  
Woo Ram Kang ◽  
Hyuk Taek Kwon ◽  
Soobin Kim ◽  
Myungeun Seo ◽  
...  

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Zeynep Sumer ◽  
Seda Keskin

Atomically detailed simulations were used to examine CO2/N2separation potential of metal organic framework- (MOF-) based mixed matrix membranes (MMMs) in this study. Gas permeability and selectivity of 700 new MMMs composed of 70 different MOFs and 10 different polymers were calculated for CO2/N2separation. This is the largest number of MOF-based MMMs for which computational screening is done to date. Selecting the appropriate MOFs as filler particles in polymers resulted in MMMs that have higher CO2/N2selectivities and higher CO2permeabilities compared to pure polymer membranes. We showed that, for polymers that have low CO2permeabilities but high CO2selectivities, the identity of the MOF used as filler is not important. All MOFs enhanced the CO2permeabilities of this type of polymers without changing their selectivities. Several MOF-based MMMs were identified to exceed the upper bound established for polymers. The methods we introduced in this study will create many opportunities to select the MOF/polymer combinations with useful properties for CO2separation applications.


Author(s):  
E. A. Grushevenko ◽  
I. L. Borisov ◽  
A. V. Volkov

Abstract The most promising approaches to making polysiloxane-based membranes more selective are considered. These approaches can be subdivided into three groups: (1) development of new membrane materials by copolymerization, (2) modification of the polysiloxane chain (in the backbone and pendant chains), and (3) development of mixed matrix membranes. All the three approaches are subjected to a critical analysis, and conclusions are made on the prospects for the development of high-selectivity materials and high-performance membranes based on them. The data are presented from the viewpoint of applied aspects of polysiloxane-based membranes.


2010 ◽  
Vol 46 (33) ◽  
pp. 6171 ◽  
Author(s):  
Masakoto Kanezashi ◽  
Mitsunori Sano ◽  
Tomohisa Yoshioka ◽  
Toshinori Tsuru

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