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Extraction of rare earth ions from phosphate leach solution using emulsion liquid membrane in concentrated nitric acid medium

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Journal of Rare Earths 2018年第11期36卷 1190-1197页

作者： Qianlin Chen Xin Ma Xin Zhang Yunqi Liu Ming Yu School of Chemistry and Chemical Engineering Cuizhou University Guiyang 550003 China Guizhou Engineering & Technology Research Center of Clean Production in Phosphorus Chemical Industry Guiyang 550003 China

It is very significant to recover rare earths （REs） from wet-process phosphoric acid, in terms of extraction rate and selectivity, the current carrier di（2-ethlhexly） phosphate （D2EHPA） out there is still inferior. Based on this question, our team modified D2EHPA to synthesize new extractants. This paper presents a comprehensive study on the extraction of rare earth ions （RE3＋） from phosphate leach solution using emulsion liquid membrane （ELM） in concentrated nitric acid medium. The ELM system is made up of （RO）2P（O）OPh-COOH as carrier, polyisocrotyl succinimide （T154） as surfactant, sulfonated kerosene as diluent, phosphoric acid （H3PO4） as stripping solution. Different chemical parameters such as type and concentration of carrier, surfactant, stripping solution, volume ratio of oil phase to internal phase, and volume ratio of emulsion ratio to external phase were analyzed. The extraction of RE^3＋ was evaluated by the yield of extraction. In addition, the demulsification process was also investigated. The proposed method of ELM using （RO）2P（O）OPh-COOH as carrier can he expected to provide an efficient, simplify operation, and facilitated method for extractine RE^3＋.

关键词： emulsion liquid membrane Rare earth Nitric acid Extraction rate Phosphate rock Stripping solution

Biomimetic Synthesis of CdSe Quantum Dots through emulsion liquid membrane System of Gas-liquid Transport

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Chinese Journal of Chemistry 2004年第5期22卷 441-444页

作者：刘璐吴庆生丁亚平柳华杰张保权 Department of Chemistry Tongji University Shanghai 200092 China Department of Chemistry Shanghai University Shanghai 200436 China Center of Technology Tangshan Steel and Iron Co. Ltd Tangshan Hebei 063016 China

The cadmium selenide quantum dots (QD) have been synthesized by template-control in an emulsion liquid membrane system. The system consisted of kerosene as solvent, L152 (dialkylene succinimide) as surfactant, N7301 (trialiphatic amine, Ra, R=C8-C10) as carrier, 0.1 mol/L CdCl2 solution as internal-aqueous phase and H2Se gas as external phase. Additive organic template agent in internal-aqueous phase was necessary to fom CdSe QD. The influence of the nature of template and its concentration on sizes of the formed CdSe QD has also been studied. Transmission electron microscopy showed that the sizes of the products could be controlled down to 3-4 nm. X-ray diffraction analysis revealed that the crystals had cubic structure. The formation process and the optical properties of CdSe QD have also been presented.

关键词： emulsion liquid membrane CdSe quantum dot template-control nanoparticle biomimetic synthesis

Preparation of 6-APA by Enzymatic Bioconversion in an emulsion liquid membrane Reactor

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Chinese Journal of Chemical Engineering 2001年第4期9卷 431-435页

作者：陆强胡鸣熊丹柳邓修 UnilabResearchCenterofChemicalReactionEngineering EastChinaUniversityofScienceandTechnologyShanghai200237China ChemicalEngineeringResearchCenter EastChinaUniversityofScienceandTechnologyShanghai200237China

Production of 6-aminopenicillanic acid (6-APA) by hydrolysis using penicillin acylase (PA) was studied as a model of an enzymatic emulsion liquid membrane (ELM) process. The loss of PA activity was examined for various membrane compositions (organic solvent, surfactant, carrier). The effects of some experimental variables on the stability of emulsion were investigated. It was found that the choice of organic solvent greatly affected the stability of the emulsion. Increasing the concentration of the carrier in the membrane phase increases the transfer rate of substrate and products but also has a destabilizing effect on the emulsion. The recovery of 6-APA obtained by a di-carrier system (N263-N1923) was much higher than those when either of the di-carriers was used separately. The whole process was controlled both by the enzymatic reaction rate and by the transfer rate of the substrate and the products, however, the ratio of them could be changed by varying the composition of the system. For an optimum condition, it was obtained that the recovery ratio of 6-APA was over 80% and the conversion of benzyl penicillin (PG) was up to 90% in the external phase after 30 minutes. Meanwhile, the breakage percentage of the emulsion was less than 2%.

关键词： 6-aminopenicillanic acid penicillin enzymatic bioconversion emulsion liquid membrane reactor

Assembling Synthesis of ZnSe Orthohexagonal Slices through emulsion liquid membrane System of Gas-liquid Transport

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Chinese Chemical Letters 2005年第3期16卷 375-378页

作者： LuLIU QingShengWU YaPingDING HuaJieLIU DepartmentofChemistry TongjiUniversityShanghai200092 DepartmentofChemistry ShanghaiUniversityShanghai200436

Orthohexagonal slices assembled by ZnSe quantum dots were synthesized through emulsion liquid membrane system. These orthohexagonal slices were 1.5-3.5 μm in side length and were self-assembled by ZnSe quantum dots of 2-3 nm. It was proposed the surfactant molecules on ZnSe quantum dots played a key role in the self-assembly process.

关键词： ZnSe emulsion liquid membrane orthohexagonal slices self-assembly.

Study of Transport and Separation of Rare Earth Ions through the emulsion liquid membrane of Bis(2,4,4-trimethylpentyl)phosphinic Acid-Span 80-Toluene

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Journal of Rare Earths 1993年第4期11卷 241-245页

作者：李克安邹长英姚晓华童沈阳 Department of Chemistry Peking UniversityBeijing 100871China Visiting scholar from Shanxi Worker Medical College

It is indicated from a study of transport of rare earth ions through the emulsion liquid mem- brane of bis(2,4,4-trimethylpentyl)phosphinic acid-Span 80-toluene that transporting rare earth ions com- pletely and rapidly was realized under the optimum experimental conditions:1.0×10^(-3)～3.0×10^(-3)mol/L bis(2,4,4-trimethylpentyl)phosphinic acid and 2%～4%(W/V)Span 80 in toluene solution as membrane phase,0.50～2.0 mol/L HCl as inner phase,rare earth ion solutions with pH 3.5～5.0 as outer ***- cording to the differences of transport behavior for rare earth ions,it is possible to separate rare earth ions from mixed solutions of rare earth ions by this liquid membrane system.

关键词： emulsion liquid membrane Ionic transport Rare earth separation Bis(2,4,4-trimethylpentyl)phosphinic acid(Cyanex 272)

Recovery of Gallium from Zinc Hydrometallurgy System by emulsion liquid membrane

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Rare Metals 1998年第4期17卷 21-26页

作者：石太宏王松平万印华张秀娟华南理工大学环境科学所广东广州

The investigation of recovery Ga 3+ by emulsion liquid membrane (ELM) using Tri alkyl oxide phosphine (TRPO) as the mobile carrier was reported. The optimum emulsion liquid membrane conditions were determinated. They were: the feed pH 1.0, organic phase consisting of 5% TRPO, 4% LMS 2 and 2% liquid paraffin in kerosene solution, 10% K 4[Fe(CN) 6] aq. solution as the stripping agent, R oi =2∶1, R ew =1∶5. At the optimum ELM operating condition, the recovery rate of gallium was 96.5%, and the oil phase can be reused for 5 times.

关键词： Gallium emulsion liquid membrane Zinc hydrometallurgy Recovery

Transfer of uranium(VI) through emulsion liquid membrane with N,N-dibutyloctanamide as a carrier

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Nuclear Science and Techniques 1998年第3期 22-24页

作者： Han Jing Tian, Sun Guo Xin, Bao Bo Rong ( Shanghai Institute of Nuclear Research, the Chinese Academy of Sciences, Shanghai 201800) Sun Si Xiu ( Department of Chemistry, Shandong University, Jinan 250100)

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｌｉｑｕｉｄｍｅｍｂｒａｎｅｓ，ｂｏｔｈｅｍｕｌｓｉｏｎｌｉｑｕｉｄｍｅｍｂｒａｎｅｓ（ＥＬＭ）ａｎｄｓｕｐｐｏｒｔｅｄｌｉｑｕｉｄｍｅｍｂｒａｎｅｓ（ＳＬＭ），ａｒｅｗｉｄｅｌｙｕ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｌｉｑｕｉｄｍｅｍｂｒａｎｅｓ，ｂｏｔｈｅｍｕｌｓｉｏｎｌｉｑｕｉｄｍｅｍｂｒａｎｅｓ（ＥＬＭ）ａｎｄｓｕｐｐｏｒｔｅｄｌｉｑｕｉｄｍｅｍｂｒａｎｅｓ（ＳＬＭ），ａｒｅｗｉｄｅｌｙｕｓｅｄｉｎｖａｒｉｏｕｓｆｉｅｌｄ...

关键词： Uranium(VI) N N dibutyloctanamide(DBOA) emulsion liquid membrane

Extraction of Neodymium by emulsion-liquid-membrane within Hollow-Fiber-contactor and Its Mass Transfer Properties

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Journal of Rare Earths 2006年第3期24卷 280-280页

作者： Gong Fuzhong Luo Yan Ma Peihua Zhang Limei School of Chemistry ＆ Chemical Engineering Guangxi University Nanning 530004 China Qinghai Institute of Salt Lake Chinese Academy of Sciences Xining 810008 China

A non-dispersive extraction technique, using an emulsion liquid membrane within a hollow-fiber-contactor for the extraction and enrichment of Nd^3＋ from the dilute feed aqueous, was applied. The emulsion system is consisted of span80 [ sorbitian monooleate], paraffin oil, D2EHPA [ 2-（ 2-ethylhexyl- phosphonic acid）], kerosene as well as HCl solution. The extraction under various conditions such as the span80 concentrations, the flow rate of aqueous, the extraction time and HCl concentrations in receiving phase were studied. Results show that the lower the flow rates of aqueous are, the higher the extraction percentage and enrichment-fold are, and the extraction percentage increases with the increasing of HCl concentrations. When the initial Nd^3＋ concentration in feed is maintained at 1000 mg· L^-1 and the emulsion is recycled with 70 times by a counter-flow,

关键词： emulsion liquid membrane hollow-fiber-membrane non-dispersive extraction mass-transfer coefficient neodymium rare earths

Determination of Dioxins in Blood Using Nano-baskets Doped in emulsion liquid membranes

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Chemical Research in Chinese Universities 2013年第1期29卷 30-36页

作者： MOKHTARI Bahram POURABDOLLAH Kobra Razi Chemistry Research Center(RCRC) Shahreza Branch Islamic Azad University Shahreza Iran

Extraction of dioxins from blood samples was carried out by inclusion-facilitated emulsion liquid membrane process. The novelty of this work is the application of nano-baskets of calixarene and emulsion liquid membranes in the selective and efficient preconcentration of dioxin. For this aim, four derivatives ofp-tert-calix[4]arene bearing different sulfonamide moieties were synthesized and their inclusion-extraction parameters were optimized including the calixarene＇s scaffold and concentration（as the carrier/demulsifier）, the diluent type in membrane, the phase and the treat ratio, mixing speed, and initial solute concentration. Determinations were followed by a gas chromatograph and the results reveal that under the optimized operating conditions, the preconcentration of dioxins was improved and the method achieved lower limit of detections（LODs）. Under optimal conditions, the figures of merits were determined to be LOD 1.0 pg/L, dynamic range 0.6--112.0 pg/L, RSD 5.5%（n=5）, and the maximum enrichment factor and recovery were determined to be 3.3 and 99%, respectively.

关键词： Nano-basket Dioxin Inclusion Calixarene emulsion liquid membrane