Carbon molecular sieve membranes for selective CO2 separation at elevated temperatures and pressures

Rahimalimamaghani, Arash; Godini, Hamid Reza; Mboussi, M.; Tanaka, A. Pacheco; Tanco, Margot Llosa; Gallucci, Fausto

doi:10.1016/j.jcou.2022.102378

Cited by 7 publications

(14 citation statements)

References 24 publications

(24 reference statements)

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“…All the explanations regarding the effect of ethylene diamine in increasing the CO 2 selective CMS membranes could be found in our previously published works. 50,52 The PSD of the fabricated membranes with varying ethylene diamine amounts in their dipping solution was measured via permporometry and reported in Figure 5. Increasing ethylene diamine in the dipping solution shifted the pores to a smaller size.…”

Section: Cms Permeation Resultsmentioning

confidence: 99%

Carbon Molecular Sieve Membranes for Selective CO₂/CH₄ and CO₂/N₂ Separation: Experimental Study, Optimal Process Design, and Economic Analysis

Rahimalimamaghani

Ramezani

Tanaka

et al. 2023

Ind. Eng. Chem. Res.

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Membrane technology is considered a high-efficiency separation and purification technology due to its low carbon footprint and low energy consumption. In this work, carbon molecular sieve (CMS) membranes for the selective separation of CO2 from methane and nitrogen were successfully fabricated. A gas permeation setup was employed to test CO2/N2, CO2/CH4 perm-selectivities, and CO2 permeances of the CMS membranes. To study the impact of temperature and pressure, the experiments have been carried out at a temperature range from 20 to 350 °C and pressure from 1 to 40 bar. Furthermore, a novel multistage membrane process design was proposed to test the feasibility of the fabricated membranes for CO2 separation from different sources of carbon emission. Three major sweetening processes are considered, including CO2 capture from coal-fired flue gas, biogas upgrading (BG), and natural gas (NG). A structural optimization approach is applied to determine the most efficient membrane strategy from the point of view of gas separation cost. By varying the membrane properties and separation targets, the effect of these parameters on capital expenditure (CAPEX), operating expenditure (OPEX), and energy consumption was studied. The economic assessment revealed a superior potential for CO2/N2 separation with a capture cost of 41.8 €/ton of CO2 and energy consumption of 1.9 GJ/ton CO2. The use of the optimal two-stage membrane configuration resulted in a competitive CO2/CH4 separation cost of 4.2 €/ton of sweet NG and 23 €/ton of BG for natural gas and biogas upgrading, respectively.

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Section: Cms Permeation Resultsmentioning

confidence: 99%

Carbon Molecular Sieve Membranes for Selective CO₂/CH₄ and CO₂/N₂ Separation: Experimental Study, Optimal Process Design, and Economic Analysis

Rahimalimamaghani

Ramezani

Tanaka

et al. 2023

Ind. Eng. Chem. Res.

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“…In fact, using a molecular sieve carbon membrane is a promising separation concept in this regard not only as it is compatible with the composition but also with the high temperature of the targeted CO 2 -rich streams (e.g., steel mill gas). It has been demonstrated that such membranes with proper specifications [16] can be used for such tasks promising an energy-efficient separation process with a lower carbon footprint.…”

Section: Membrane: Co 2 -Dosing and Water Removalmentioning

confidence: 99%

“…In particular, it is targeted in this research to integrate an in-situ selective CO 2separation through the membrane with the adjacent catalytic CO 2 -conversion, where CO 2 is simultaneously distributed along the catalytic bed while being ideally hydrogenated to methanol [8] and DME. The general characteristics of this CMSM, including its capability to operate at high temperature and pressure [16] along with the available potential in tuning the synthesis parameters to tailor its selective separation performance, are the main advantages of this type of membrane for the targeted application in this research.…”

Section: Membrane Synthesis and Potentialsmentioning

confidence: 99%

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Multiscale Analysis of Membrane-Assisted Integrated Reactors for CO2 Hydrogenation to Dimethyl Ether

Godini,

Rahimalimamaghani,

Hosseini

et al. 2023

Catalysts

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The conceptual design and engineering of an integrated catalytic reactor requires a thorough understanding of the prevailing mechanisms and phenomena to ensure a safe operation while achieving desirable efficiency and product yields. The necessity and importance of these requirements are demonstrated in this investigation in the case of novel membrane-assisted reactors tailored for CO2 hydrogenation. Firstly, a carbon molecular sieve membrane was developed for simultaneous separation of CO2 from a hot post-combustion CO2-rich stream, followed by directing it along a packed-bed of hybrid CuO-ZnO/ZSM5 catalysts to react with hydrogen and produce DiMethyl Ether (DME). The generated water is removed from the catalytic bed by permeation through the membrane which enables reaction equilibrium shift towards more CO2-conversion. Extra process intensification was achieved using a membrane-assisted reactive distillation reactor, where similarly several such parallel membranes were erected inside a catalytic bed to form a reactive-distillation column. This provides the opportunity for a synchronized separation of CO2 and water by a membrane, mixing the educts (i.e., hydrogen and CO2) and controlling the reaction along the catalytic bed while distilling the products (i.e., methanol, water and DME) through the catalyst loaded column. The hybrid catalyst and carbon molecular sieve membrane were developed using the synthesis methods and proved experimentally to be among the most efficient compared to the state-of-the-art. In this context, selective permeation of the membrane and selective catalytic conversion of hybrid catalysts under the targeted operating temperature range of 200–260 °C and 10–20 bar pressure were studied. For the membrane, the obtained high flux of selective CO2-permeation was beyond the Robeson upper bound. Moreover, in the hybrid catalytic structure, a combined methanol and DME yield of 15% was secured. Detailed results of catalyst and membrane synthesis and characterization along with catalyst test and membrane permeation tests are reported in this paper. The performance of various configurations of integrated catalytic and separation systems was studied through an experimentally supported simulation along with the systematic analysis of the conceptual design and operation of such reactive distillation. Focusing on the subnano-/micro-meter scale, the performance of sequential reactions while considering the interaction of the involved catalytic materials on the overall performance of the hybrid catalyst structure was studied. On the same scale, the mechanism of separation through membrane pores was analyzed. Moreover, looking at the micro-/milli-meter scale in the vicinity of the catalyst and membrane, the impacts of equilibrium shift and the in-situ separation of CO2 and steam were analyzed, respectively. Finally, at the macro-scale separation of components, the impacts of established temperature, pressure and concentration profiles along the reactive distillation column were analyzed. The desired characteristics of the integrated membrane reactor at different scales could be identified in this manner.

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“…Among inorganic membranes, CMS membranes, which are normally fabricated via carbonization of polymeric precursors, have attracted much attention for gas separation applications due to their precise pore size for molecule sieving, superior thermal and chemical stabilities, 17 and relatively lower cost compared to other inorganic membranes. 18 Normally, CMS membranes exhibit both micropores (7−20 Å) and ultramicropores (<7 Å). 19,20 For gas separation applications, as many targeted separation gas pairs are smaller than 4 Å (e.g., dynamic diameters of H 2 and CO 2 are 2.89 and 3.3 Å, respectively), in most cases, it is the micropores that offer the molecule sieving.…”

Section: Introductionmentioning

confidence: 99%

Thin-Film-Composite Carbon Molecular Sieve Membranes for Efficient Helium and Hydrogen Separation

Feng,

Guo,

Deng

et al. 2023

Ind. Eng. Chem. Res.

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Carbon molecular sieve (CMS) membranes have been proven to be effective gas separation membranes, especially for light gas separation. In the current work, Troger's base polymer (TB)/poly(styrene sulfonic acid) (PSS) thin-film-composite (TFC) carbon molecular sieve (CMS) membranes were prepared by dip-coating and subsequent carbonization. Porous anodic aluminum oxide (AAO) plates were employed as the support layer, and carboxylated nanocellulose fiber (CNF) was used as the sacrificed layer. The effects of membrane preparation conditions, including solution concentration and carbonization temperature, and operating conditions, such as feed pressure and test temperature, on the hydrogen (H 2 ) and helium (He) separation performance were systematically investigated. Meanwhile, the relationship between gas separation performances and the microstructure of TFC CMS membranes was explored by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectrum. With a carbonization temperature of 550 °C, the H 2 /CH 4 (149.25), H 2 /N 2 (131.04), He/CH 4 (137.07), and He/N 2 (120.35) selectivity of the TB/PSS membrane prepared at a solution concentration of 10 wt % was significantly higher than other TFC CMS membranes, and the H 2 and He permeances were 1359.73 GPU and 1248.49 GPU under a feed pressure of 2 bar, respectively. The excellent gas separation performance of this membrane demonstrates its great potential for H 2 and He purification applications.

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Carbon molecular sieve membranes for selective CO2 separation at elevated temperatures and pressures

Cited by 7 publications

References 24 publications

Carbon Molecular Sieve Membranes for Selective CO₂/CH₄ and CO₂/N₂ Separation: Experimental Study, Optimal Process Design, and Economic Analysis

Carbon Molecular Sieve Membranes for Selective CO₂/CH₄ and CO₂/N₂ Separation: Experimental Study, Optimal Process Design, and Economic Analysis

Multiscale Analysis of Membrane-Assisted Integrated Reactors for CO2 Hydrogenation to Dimethyl Ether

Thin-Film-Composite Carbon Molecular Sieve Membranes for Efficient Helium and Hydrogen Separation

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Carbon molecular sieve membranes for selective CO2 separation at elevated temperatures and pressures

Cited by 7 publications

References 24 publications

Carbon Molecular Sieve Membranes for Selective CO2/CH4 and CO2/N2 Separation: Experimental Study, Optimal Process Design, and Economic Analysis

Carbon Molecular Sieve Membranes for Selective CO2/CH4 and CO2/N2 Separation: Experimental Study, Optimal Process Design, and Economic Analysis

Multiscale Analysis of Membrane-Assisted Integrated Reactors for CO2 Hydrogenation to Dimethyl Ether

Thin-Film-Composite Carbon Molecular Sieve Membranes for Efficient Helium and Hydrogen Separation

Contact Info

Product

Resources

About

Carbon Molecular Sieve Membranes for Selective CO₂/CH₄ and CO₂/N₂ Separation: Experimental Study, Optimal Process Design, and Economic Analysis

Carbon Molecular Sieve Membranes for Selective CO₂/CH₄ and CO₂/N₂ Separation: Experimental Study, Optimal Process Design, and Economic Analysis