Zeolite membrane process for industrial CO2/CH4 separation

Nobandegani, Mojtaba Sinaei; Yu, Liang; Hedlund, Jonas

doi:10.1016/j.cej.2022.137223

Cited by 21 publications

(26 citation statements)

References 60 publications

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“…Copolymers. Through a free-radical polymerization (FRP) method, AP NMA and AP MAA with a similar number and average molecular weight (M n ) of 60.0 and 58.3 kg mol −1 , respectively, as estimated by GPC measurement (Figure S8) and a fixed ratio of 0.8:0.2 as calculated by 1 H NMR spectroscopy were obtained (Figure S9a,b). The 1 H NMR spectrum in Figure S9a confirms the chemical structures of AP NMA .…”

Section: Characterization Of Amphiphilicmentioning

confidence: 99%

“…Zeolite membranes have highly uniform micropores that allow for selective adsorption and diffusion of molecules based on the pore topology. Zeolite membranes can provide superior selectivity and permeability for gas separations, including CO 2 /CH 4 , − CO 2 /N 2 , − and H 2 /CH 4 . , MOFs consist of metal ions or clusters connected by organic ligands to form highly ordered crystalline frameworks with large surface areas and well-defined pore sizes. The pore size and surface chemistry of MOFs can be easily tailored to selectively adsorb or exclude gas molecules.…”

Section: Introductionmentioning

confidence: 99%

“…Yield, 90%, M n(GPC) = 60 kg mol −1 , M w /M n = 1.19. The value of 1 The same method was conducted to polymerize AP MAA with the same desired ratio of 0.8:0.2. A series of chemicals consisting of BA (8.02 mL, 56 mmol), MAA (1181.22 μL, 14 mmol), THF (32 mL), and AIBN (46 mg, 0.28 mmol) was placed into a round-bottom flask that has been sealed with a rubber septum.…”

Section: Introductionmentioning

confidence: 99%

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Vacuum-Assisted Self-Healing Amphiphilic Copolymer Membranes for Gas Separation

Hong

Laysandra

Chiu

et al. 2023

ACS Appl. Mater. Interfaces

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Membrane gas separation provides a multitude of benefits over alternative separation techniques, especially in terms of energy efficiency and environmental sustainability. While polymeric membranes have been extensively investigated for gas separations, their self-healing capabilities have often been neglected. In this work, we have developed innovative self-healing amphiphilic copolymers by strategically incorporating three functional segments: n-butyl acrylate (BA), N-(hydroxymethyl)acrylamide (NMA), and methacrylic acid (MAA). Utilizing these three functional components, we have synthesized two distinct amphiphilic copolymers, namely, AP NMA (PBA x -co-PNMA y ) and AP MAA (PBA x -co-PMAA y ). These copolymers have been meticulously designed for gas separation applications. During the creation of these amphiphilic copolymers, BA and NMA segments were selected due to their vital role in the ease of tuning mechanical and self-healing properties. The functional groups (−OH and −NH) present on the NMA segment interact with CO 2 through hydrogen bonding, thereby boosting CO 2 /N 2 separation and achieving superior selectivity. We assessed the self-healing potential of these amphiphilic copolymer membranes using two distinct strategies: conventional and vacuum-assisted self-healing. In the vacuum-assisted approach, a robust vacuum pump generates a suction force, leading to the formation of a cone-like shape in the membrane. This formation allows common fracture sites to adhere and trigger the self-healing process. As a result, AP NMA maintains its high gas permeability and CO 2 /N 2 selectivity even after the vacuum-assisted self-healing operation. The ideal CO 2 /N 2 selectivity of the AP NMA membrane aligns closely with the commercially available PEBAX-1657 membrane (17.54 vs 20.09). Notably, the gas selectivity of the AP NMA membrane can be readily restored after damage, in contrast to the PEBAX-1657 membrane, which loses its selectivity upon damage.

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Section: Characterization Of Amphiphilicmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vacuum-Assisted Self-Healing Amphiphilic Copolymer Membranes for Gas Separation

Hong

Laysandra

Chiu

et al. 2023

ACS Appl. Mater. Interfaces

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“…Membrane separation technology is emerging as an attractive candidate for the separation of methanol/MTBE mixtures due to its advantages such as environmentally friendly, simple operation, and energy conservation. 1,2 Membrane materials are the key to separating methanol/MTBE mixtures, which can form azeotrope mixtures with molecular level difference. 3 Zeolite membranes are considered ideal materials for the separation of methanol/ MTBE mixtures due to the molecule-leveled, uniform pores in zeolite crystals and their other excellent properties.…”

Section: Introductionmentioning

confidence: 99%

“…It is necessary to remove the unreacted methanol to purify MTBE during its preparation process. Membrane separation technology is emerging as an attractive candidate for the separation of methanol/MTBE mixtures due to its advantages such as environmentally friendly, simple operation, and energy conservation. , Membrane materials are the key to separating methanol/MTBE mixtures, which can form azeotrope mixtures with molecular level difference . Zeolite membranes are considered ideal materials for the separation of methanol/MTBE mixtures due to the molecule-leveled, uniform pores in zeolite crystals and their other excellent properties. , Although the quality of zeolite membranes has been greatly improved in recent years, there are still notable defects with pore sizes larger than the crystal channel in zeolite membranes. − The defects allow the mixtures to pass through the zeolite membranes indiscriminately rather than through the crystal channel differentially, seriously worsening the separation selectivity. , Therefore, the causes of the defects need to be determined, and the defects need to be eliminated during the preparation of zeolite membranes.…”

Section: Introductionmentioning

confidence: 99%

Hydro-Solvothermal Synthesis of NaX Zeolite Membranes for the Separation of MeOH/Methyl tert-Butyl Ether Mixtures

Wei,

Song,

Luo

et al. 2023

Ind. Eng. Chem. Res.

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Zeolite membranes are emerging as attractive candidates for the separation of methanol/methyl tert-butyl ether (MTBE) mixtures, while the random deposition of silicon aluminum components on the surface of the support can lead to the poor quality of zeolite membranes, restricting the use of zeolite membranes in separation and purification applications. In this study, the deposition process of the silicon aluminum components was controlled, and compact NaX zeolite membranes with great pervaporation performance for methanol/MTBE mixtures were synthesized using water–organic solvent synthesis solutions. Systematic research showed the existence of a stable “liquid film” on the surface of the support controlling the formation environment of zeolite membranes during their synthesis; organic solvents that partly replaced water in the synthesis solution improved the quality of the zeolite membranes. The water–organic solvent system could not only decrease the nucleation and crystallization rate of zeolite particles in the main body of the synthesis solution and reduce the consumption of silicon aluminum components in the main body of the synthesis solution but also promote the migration of silicon aluminum components to the “liquid film” on the surface of the support from the main body of the synthesis solution, thus promoting the growth of zeolite membranes. The zeolite membrane synthesized in the 20(v) % 1,3-propanediol synthesis solution exhibited a MeOH/MTBE separation factor greater than 10,000 with a permeation flux of 1.6 kg·m–2·h–1, indicating that a compact zeolite membrane was grown on the support. In this work, the formation of zeolite membranes was controlled by adding an organic solvent to the synthesis solution to adjust the deposition process of silicon aluminum components to the support and a new method for the preparation of compact membranes was developed.

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