Membrane‐Supported Liquid‐Liquid Extraction – Where Do We Stand Today?

Riedl, Wolfgang

doi:10.1002/cben.202000032

Cited by 13 publications

(7 citation statements)

References 23 publications

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“…The use of liquid-liquid membrane contactors also has the following advantages: (1) no phase dispersion, as the membrane acts as a mass transfer surface; (2) modularity and compactness; (3) low metal capacity of the equipment; and (4) energy efficiency [ 26 , 27 ]. The possibility of using membrane contactors for extraction of ions has been shown in a number of studies [ 28 , 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Reclaiming of Amine CO2 Solvent Using Extraction of Heat Stable Salts in Liquid-Liquid Membrane Contactor

et al. 2023

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Amine CO2 solvents undergo oxidative degradation with the formation of heat stable salts (HSS). These HSS reduce the sorption capacity of amines and lead to intense corrosion of the equipment. In our work, we propose a membrane-supported liquid-liquid extraction of the HSS from alkanolamines. For this purpose, a hollow fiber membrane contactor was used for the first time. A lab-scale extraction system on the basis of a hollow-fiber liquid-liquid membrane contactor with hollow fiber ultrafiltration polyvinylidenefluoride and polysulfone membranes has been studied. The extraction of the HSS-ions from a 30 wt.% solution of monoethanolamine was carried out using a 0.25–1 M solution of OH-modified methyltrioctylammonium chloride in 1-octanol as an extractant. It has been shown that >90% of HSS ions can be extracted from the alkanolamine solvent within 8 h after extraction. The results obtained confirm the possibility of using membrane extraction with a liquid-liquid membrane contactor for the reclaiming of amine CO2 solvents to increase the general efficiency of carbon dioxide capture.

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Section: Introductionmentioning

confidence: 99%

Reclaiming of Amine CO2 Solvent Using Extraction of Heat Stable Salts in Liquid-Liquid Membrane Contactor

et al. 2023

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“…To address the above issues associated with membrane-based mixer-settlers, membrane contactors have been developed and widely used in the petrochemical, pharmaceutical, and galvanic industry, where the membranes passively separate two fluid phases by acting as artificial interfaces instead of filtering. , Generally, the interface between the two liquids forms near the pore exits of the membrane on the side where the non-membrane wetting liquid phase is located. Interfacial forces stabilize the aqueous-organic interface within the pores of the membrane, where the maximum pressure difference in the membrane can support without breakthrough is a function of the membrane contact angle, pore size, and interfacial tension. , It is important to note that the process is based on the diffusion of the solute passing from the feed into the extractant, driven by a difference in chemical potential. This technique possesses several advantages including stable interface, less emulsion formation, no requirements for phase separation, density difference, and ease of on-line coupling with reactors and analyzers.…”

Section: Introdutionmentioning

confidence: 99%

“…Interfacial forces stabilize the aqueous-organic interface within the pores of the membrane, where the maximum pressure difference in the membrane can support without breakthrough is a function of the membrane contact angle, pore size, and interfacial tension. 21,22 It is important to note that the process is based on the diffusion of the solute passing from the feed into the extractant, driven by a difference in chemical potential. This technique possesses several advantages including stable interface, less emulsion formation, no requirements for phase separation, density difference, and ease of on-line coupling with reactors and analyzers.…”

Section: Introdutionmentioning

confidence: 99%

Ultrathin Hydrophobic Inorganic Membranes via Femtosecond Laser Engraving for Efficient and Stable Extraction in a Microseparator

Nie

Song

et al. 2022

Ind. Eng. Chem. Res.

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Miniaturization of separators is essential owing to the enhanced surface area and reduced diffusion distance. It is difficult to realize membrane-based countercurrent extraction in the microscale as surface forces dominate over gravity forces and a considerable pressure drop perturbs pressure control. Here, we report a new route for continuous and high-yield extraction in microchannel membrane contactors using inorganic membranes with collective effects of femtosecond laser engraving and hydrophobic self-assembly, resulting in similar extraction efficiencies as organic membranes but with a much wider operating range and better durability, owing to their uniform pore size at 10 μm, hydrophobic feature, and model-guided pressure control. Compared to conventional devices, the lower flow capacity of the microseparator could be offset by reduction in "height equivalent to a theoretical plate", resulting in potential orders of magnitude reduction in device volume. The microseparator was then integrated with a microreactor for continuous synthesis and separation of a highly explosive chemical, methyl ethyl ketone peroxide, from which high extraction efficiencies were obtained with the final product meeting industrial standard. This work provides an attractive alternative, inorganic membranes, to organic membranes in microscale separation with improved stability and a wider operating range.

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“…There will not be a required density difference between the phases. The unique features of hollow fiber membranes have made several investigators examine their application in liquid-liquid extraction [18]. Many literatures reported the mass transfer study on membrane solvent extraction [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Performance of PES Membrane Contactor on the Separation of Dilute Acetic Acid from Aqueous Forms

Sofiya¹,

Sivaraman²

2022

Int. J. Membrane Sci. Techno.

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The azeotropic characteristics of acetic acid between water make its separation from its aqueous phase essential. Many methods are studied for separating such a mixture. Solvent extraction using membrane contactors can increase the contact surface area. The dilute aqueous acetic acid extraction with the solvents petroleum ether and diisopropyl ether in a Poly Ether Sulfone (PES) hollow fiber membrane contactor was studied. The solvents and membrane extraction abilities are evaluated by exchanging the fluids on the shell and tube sides based on the distribution coefficients and total mass transfer coefficient at various flow rates. The findings show that when the solvent flow is increased, whether on the shell side or the tube side, the concentration of acetic acid increases in its solvent phase. As the shell side Reynolds number increased, it was noticed that the distribution coefficient value also increased. Both solvents' extraction ability was minimal, but diisopropyl ether gave better results when compared with the petroleum ether in terms of distribution coefficient. Three film resistance parameters in the series model have determined the overall mass transfer coefficient. The Reynolds number values showed that the mass transfer occurs in a laminar zone. Changes in the petroleum ether's Reynolds number on the tube side resulted in a maximum mass transfer coefficient of 11.41x10-6 m/s. Data on such hydrodynamics studies on membrane solvent extraction can help recover value-added material studies.

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Membrane‐Supported Liquid‐Liquid Extraction – Where Do We Stand Today?

Cited by 13 publications

References 23 publications

Reclaiming of Amine CO2 Solvent Using Extraction of Heat Stable Salts in Liquid-Liquid Membrane Contactor

Reclaiming of Amine CO2 Solvent Using Extraction of Heat Stable Salts in Liquid-Liquid Membrane Contactor

Ultrathin Hydrophobic Inorganic Membranes via Femtosecond Laser Engraving for Efficient and Stable Extraction in a Microseparator

Performance of PES Membrane Contactor on the Separation of Dilute Acetic Acid from Aqueous Forms

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