Iron-containing carbon molecular sieve membranes for advanced olefin/paraffin separations

Chu, Yu-Han; Yancey, David F.; Xu, Liren; Martinez, Marcos; Brayden, Mark; Koros, William J.

doi:10.1016/j.memsci.2017.11.052

Cited by 66 publications

(43 citation statements)

References 31 publications

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“…The resulting morphology features a bimodal pore size distribution populated with micropores (7-20 Å) providing high gas permeability and ultramicropores (<7 Å) yielding the strong size-sieving ability. [4,[85][86][87] Figure 7b presents the effect of the carbonization temperature for PBI on puregas H 2 and CO 2 permeability at 100 C and 7.4 atm. When carbonized at 700 C, the obtained PBI@700 exhibits H 2 permeability almost 2 orders of magnitude higher than PBI with a decrease of H 2 /CO 2 selectivity from 14 to 8.7 at 100 C. However, PBI@900 exhibits remarkably higher H 2 /CO 2 selectivity of 80 with lower H 2 permeability than PBI@700, presumably because of the densification and formation of smaller pore sizes.…”

Section: Thermally Treated Rearranged and Carbonized Polymersmentioning

confidence: 99%

Molecularly engineering polymeric membranes for H₂/CO₂ separation at 100–300 °C

Pal

Nguyen

et al. 2020

Journal of Polymer Science

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Over the last two decades, polymers with superior H2/CO2 separation properties at 100–300 °C have gathered significant interest for H2 purification and CO2 capture. This timely review presents various strategies adopted to molecularly engineer polymers for this application. We first elucidate the Robeson's upper bound at elevated temperatures for H2/CO2 separation and the advantages of high‐temperature operation (such as improved solubility selectivity and absence of CO2 plasticization), compared with conventional membrane gas separations at ~35 °C. Second, we describe commercially relevant membranes for the separation and highlight materials with free volumes tuned to discriminate H2 and CO2, including functional polymers (such as polybenzimidazole) and engineered polymers by cross‐linking, blending, thermal treatment, thermal rearrangement, and carbonization. Third, we succinctly discuss mixed matrix materials containing size‐sieving or H2‐sorptive nanofillers with attractive H2/CO2 separation properties.

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Section: Thermally Treated Rearranged and Carbonized Polymersmentioning

confidence: 99%

Molecularly engineering polymeric membranes for H₂/CO₂ separation at 100–300 °C

Pal

Nguyen

et al. 2020

Journal of Polymer Science

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“…Moreover, the different adsorption properties between the four gases could be used in separation. Chu et al [100] were inspired by the special adsorption of olefins from the Fe 2+ metal sites in Fe-MOF-74. They incorporated Fe(acac) 2 of 1.1–3.2 wt% into the perfect CMS membrane precursor, 6FDA-DAM:DABA (3:2), which was independently researched and developed to prepare the Fe hybrid polymer membrane.…”

Section: Latest Developments In Hybrid Cms Membranesmentioning

confidence: 99%

A Review on the Progress in Nanoparticle/C Hybrid CMS Membranes for Gas Separation

Song

et al. 2018

Membranes

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Carbon molecular sieve (CMS) membranes are novel materials derived from the pyrolysis of the polymeric precursors and have a well-developed ultra-microporous structure that can separate small gas pairs with minor difference in diameter, and thus exhibit higher gas permeability and selectivity than polymeric membranes. However, the gas permeability for traditional pure CMS membranes now cannot satisfy the requirements of commercial applications due to their disordered pore structure and high gas molecular diffusion resistance. Incorporating functional materials into membrane precursors to fabricate hybrid CMS membranes has been regarded as an effective way to tune the disordered pore structure of traditional pure CMS membranes, and thus to greatly improve their gas permeability. Many nanoparticles have been tested as the functional foreign materials to fabricate the hybrid CMS membranes with more developed microporous structure and enhanced gas separation performance. This review discusses the hybridized nanoparticle selection and effect of the species, quantities and particle sizes of the foreign materials on CMS membrane characteristics and performance. The function of the materials incorporated inside the hybrid CMS membranes is also analyzed. It is identified that preparation of hybrid CMS membranes provides a simple and convenient route to efficiently improve the trade-off relationship between permeability and selectivity, and to enable the construction of carbon-based composite materials with novel functionalities in membrane science.

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“…The energy intensive distillation is the primary industrial technique adopted for separating propylene from propane. A less energy demanding technique would definitely be of industry's interest [7][8].…”

Section: Introductionmentioning

confidence: 99%

Propylene - propane separation using Zeolitic-Imidazolate Framework (ZIF-8) membranes: Process techno-commercial evaluation

Alcheikhhamdon

Pinnau

Hoorfar

et al. 2019

Journal of Membrane Science

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Several recent studies investigated the use of the novel Zeolitic-Imidazolate Framework (ZIF-8) membranes for olefinparaffin separation. In this manuscript, a techno-commercial model is developed to examine the use of these membranes for separating propylene from propane. Single-stage and two-stage membrane processes were assessed for their performance compared to distillation. The assessment was conducted considering 70 wt% propylene feed, typically produced from the upstream depropanizer. The single-stage process was found technically capable and commercially competent to produce the chemical grade propylene (93 wt%), but not the polymer grade (99.5 wt%). Alternatively, the two-stage process was capable of producing both propylene grades at promising recovery and cost figures. The published propylene/propane selectivity of 35 appears adequate in meeting the separation demands, subject to the adoption of proper unit design. Future research should grant more attention towards aspects such as ZIF-8 membranes' manufacturability, cost, and performance in real environments.

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Iron-containing carbon molecular sieve membranes for advanced olefin/paraffin separations

Cited by 66 publications

References 31 publications

Molecularly engineering polymeric membranes for H₂/CO₂ separation at 100–300 °C

Molecularly engineering polymeric membranes for H₂/CO₂ separation at 100–300 °C

A Review on the Progress in Nanoparticle/C Hybrid CMS Membranes for Gas Separation

Propylene - propane separation using Zeolitic-Imidazolate Framework (ZIF-8) membranes: Process techno-commercial evaluation

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Iron-containing carbon molecular sieve membranes for advanced olefin/paraffin separations

Cited by 66 publications

References 31 publications

Molecularly engineering polymeric membranes for H2/CO2 separation at 100–300 °C

Molecularly engineering polymeric membranes for H2/CO2 separation at 100–300 °C

A Review on the Progress in Nanoparticle/C Hybrid CMS Membranes for Gas Separation

Propylene - propane separation using Zeolitic-Imidazolate Framework (ZIF-8) membranes: Process techno-commercial evaluation

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Molecularly engineering polymeric membranes for H₂/CO₂ separation at 100–300 °C

Molecularly engineering polymeric membranes for H₂/CO₂ separation at 100–300 °C