A study on a two-component liquid membrane system

Feng-Jee, Cui; Tang, Baolong; Xu, Mengmeng; Qing-Jin, Qi; Lan-Ying, Zhu

doi:10.1016/s0376-7388(00)82215-2

Cited by 21 publications

(5 citation statements)

References 3 publications

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“…Taking the fluxes listed in Table 2 into account, one can consider some of the studied macromolecular carriers (e. g. 2 b) to be able to transport transient divalent metals at a rate of l2 N 10 -11 mol/(cm 2 N s). On the other hand, some macrocycles containing a dialkylhydrogenphosphate moiety (5) with 17 ring molecules were reported [40] to transport diva- It is known from other studies [15,18,26] , that PEGs are carriers/extractants with properties parallel to those of crown ethers. This means that they can operate according to the co-transport mechanism by forming neutral complexes with ion pairs.…”

Section: Transport Properties Of Poly(oxyethylene) Phosphatesmentioning

confidence: 99%

“…On the other hand, some frontier studies were carried out to evaluate soluble macromolecular compounds as active components of liquid membranes expected to transport metal cations, [12 -20] organic [13,21,22] and gaseous substances [23] selectively. Specifically poly(ethylene glycol)s were used for preparing ELMs and transporting various cations [15,18] according to the co-transport mechanism. After doping with Rh 3+ salts, poly(ethylene glycol)s were found to be efficient in the transport and separation of some hydrocarbons from nitrogen.…”

Section: Introductionmentioning

confidence: 99%

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Mobile Macromolecular Carriers of Ionic Substances, 2. Transport Rates and Separation of Some Divalent Cations by Poly(oxyethylene) Phosphates

Wódzki¹,

̧tkowski

Łapienis

2001

Macromol. Chem. Phys.

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Section: Transport Properties Of Poly(oxyethylene) Phosphatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mobile Macromolecular Carriers of Ionic Substances, 2. Transport Rates and Separation of Some Divalent Cations by Poly(oxyethylene) Phosphates

Wódzki¹,

̧tkowski

Łapienis

2001

Macromol. Chem. Phys.

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“…It involves the emulsification of an internal liquid phase in an immiscible liquid (membrane) and then the dispersion of the resulting emulsion in a third liquid called the feed (external) phase. The internal and external liquid phases are miscible, but they are immiscible in the membrane phase …”

Section: Introductionmentioning

confidence: 99%

“…The internal and external liquid phases are miscible, but they are immiscible in the membrane phase. 36 In an ELM system, the membrane phase plays a central role. This phase consists of three compatible main components: a carrier (extractant), a surfactant, and a diluent.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Recovery of Silver from Deactivated Catalysts Using a Novel Process Combining Leaching and Emulsion Liquid Membrane Techniques

Laki

Shamsabadi

Seidi

et al. 2018

Ind. Eng. Chem. Res.

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Industrial deactivated Ag/alumina catalysts contain an appreciable amount of silver. As silver is a precious metal, it is of great economic and environmental interest to recover silver from the catalysts before disposing them. This paper introduces a novel hybrid process for efficient silver recovery from deactivated catalysts. The process combines leaching and emulsion liquid membrane (ELM) techniques. Leaching first transfers silver from catalyst particles to an aqueous solution. An ELM then extracts silver ions from the leach solution in a single separation step. To prevent emulsion instability in the ELM, a new surfactant, a relatively low number-average-molecular-weight (<6000 g/mol) polypropylene glycol-polyethylene glycol-polypropylene glycol triblock copolymer, was synthesized and characterized by 1HNMR, 13CNMR, FTIR, and GPC. While preventing the instability, this surfactant did not have any adverse effects on mass transfer. For the first time, 2-ethylhexyl phosphoric acid was used as the carrier in an ELM to facilitate silver ions transfer from the aqueous solution. A solvent consisting of paraffinic and naphthenic hydrocarbons with no aromatic components was used as the diluent. Compatibilities of the ELM components (diluent, surfactant and carrier) were evaluated using two stability methods. Ag, Ca, Si, Al, Ti, and K leaching efficiencies of 97.7, 40.0, 30.0, 15.0, 6.0 and 0.5%, respectively, were achieved at the following optimal conditions: a nitric acid concentration of 1 mol L–1, a solid/liquid ratio of 50 g L–1, a mixing speed of 500 rpm, and a temperature of 70 °C. The ELM showed a maximum Ag separation efficiency of 97% with an Ag-ion extraction time of 7.5 min, a surfactant concentration of 6% (w/v), an HNO3 strip-phase concentration of 0.6 M, a feed-phase pH of 6.5, a mixing speed of 500 rpm, a treatment ratio of 75/500, and a phase ratio of 6/5. This study points to the high potential of the hybrid process for sustainable recovery of silver from deactivated catalysts.

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“…Simultaneously, as shown by Okada,25 the respective complex formation constants are dependent on the PEG degree of polymerization. The efficiency of PEG as the component of emulsion LMs26 and the corresponding comparison of PEG and its phosphoric acid derivatives were reported elsewhere 17, 27…”

Section: Introductionmentioning

confidence: 99%

Pertraction of cations in a hybrid membrane system containing soluble polymeric ionophores

Wódzki

Świątkowski

Kałużyński

et al. 2002

J of Applied Polymer Sci

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A hybrid membrane system composed of two insoluble cation-exchange membranes (Nafion) and a liquid membrane in between was studied. A series of organic and aqueous liquid membranes containing soluble polymers as macromolecular ionophores (macroionophores) was prepared and tested. The pertraction (membrane-transport) characteristics of poly(ethylene glycol) and its ionizable derivatives, including as poly[poly(oxyethylene) phosphate] (PPOEP) and di-[-methoxy poly(oxyethylene)] phosphate, were measured and are discussed as dependent on the composition and molecular mass of a macroionophore. The liquid membrane composed of PPOEPs dissolved in dichloroethane combined the cation-exchange properties with neutral coordination functionalities introduced by the poly(oxyethylene) backbone of this ionophore. The overall fluxes, facilitation factors, and the membrane system selectivity were measured in the carrier-mediated pertraction of transient metal cations (Cu . In the case of an aquatic hybrid membrane system, high but nonselective ionic fluxes were observed.

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A study on a two-component liquid membrane system

Cited by 21 publications

References 3 publications

Mobile Macromolecular Carriers of Ionic Substances, 2. Transport Rates and Separation of Some Divalent Cations by Poly(oxyethylene) Phosphates

Mobile Macromolecular Carriers of Ionic Substances, 2. Transport Rates and Separation of Some Divalent Cations by Poly(oxyethylene) Phosphates

Sustainable Recovery of Silver from Deactivated Catalysts Using a Novel Process Combining Leaching and Emulsion Liquid Membrane Techniques

Pertraction of cations in a hybrid membrane system containing soluble polymeric ionophores

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