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

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 phase.Ac- 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.

Design and manufacture of emulsion liquid membrane based on various amine extractants for separation and extraction of succinic acid from fermentation broth

The aim of this study was to design a new emulsion liquid membrane(ELM)system for the separation of succinic acid from aqueous solutions.The concentration of succinic acid varied from 20 to 60 mmol·L^(-1).The prepared ELM system includes tributylamine(TBA)as a carrier,commercial kerosene as a solvent,Span 80 as a surfactant,and Na2CO3as a stripping agent.In order to control the membrane swelling,different values of cyclohexanone were added to the membrane phase.The effect of various empirical variables on the extraction of the succinic acid such as acid concentration in the feed solution,initial feed concentration,carrier concentration,the stirring speed of the extraction,Na2CO3,surfactant,and cyclohexanone concentrations,and treat ratio in the ELM system.The best result was obtained when TBA was used as the carrier.The final acid extraction efficiency was independent of pH variations of the aqueous feed solution.The extraction of succinic acid solution with a concentration of 40 mmol·L^(-1)was improved by increasing the treat ratio 1:7-1:3,stripping phase concentration 0.5-1.5 mol·L^(-1),stirring speed 300-500 r·min^(-1)and cyclohexanone concentration in the membrane phase 1.2-1.6 mol·L^(-1).No considerable effect on the extraction rate was observed for the carrier concentration in the membrane phase.But,the surfactant concentration in the feed phase showed a dual effect on the extraction efficiency.

Transport of Ca^(2+) Ion through a Bubbling Pseudo-emulsion Liquid Membrane with Calixarenes and Calixcrowns as Carriers

Several new calixcrowns were synthesized and characterized. The transport of Ca 2+ ion was investigated through a bubbling pseudo emulsion liquid membrane with these calixcrowns, the parent calixarenes ( n =4, 6, 8) and the ester, acid derivatives of calixarene as mobile carriers. The effects of the initial concentrations of Ca 2+ ion in the source phase and the initial pH difference (ΔpH) between the receiving phase and the source phase were studied. The results suggest that there are two different transport mechanisms. The transports using calixarenes and their ester, acid derivatives as carriers represent a proton coupled co transport with a flow of protons in the opposite direction, while the transports using the calixcrowns as carriers exhibit the characteristics of an anion coupled co transport with a flow of anion in the same direction.

Facilitated transport separation of CO_(2) and H_(2)S by supported liquid membrane based on task-specific protic ionic liquids

Selective separation of CO_(2) and H_(2)S from CH_(4) is of importance to the natural gas upgrading because of its cor-rosivity. As is well known, amine group can recognize reversibly CO_(2) and H_(2)S with a moderate interaction. Withthis in mind, this work prepared a series of amine-functionalized supported-protic-ionic-liquid membranes(SPILMs) for the selective separation of CO_(2) and H_(2)S from CH_(4) . For comparison, aprotic ionic liquid membranewas also prepared for natural gas sweetening. The effect of temperature and transmembrane pressure differenceon the permeability of single gas and ideal selectivity of CO_(2)/CH_(4) and H_(2)S/CO_(2) were studied. Facilitated transportmechanism was studied by NMR spectra. The permeability of CO_(2) in primary amine functionalized [DMPDAH][Tf_(2)N]-based membrane decreases with the increasing transmembrane pressure, indicating a typical feature offacilitated transport membrane. The permeability of CO_(2) and the ideal selective of CO_(2)/CH_(4) are as high as 2000 barrers and 53.2 at 313.2 K in [DMPDAH][Tf_(2)N] membrane, significantly higher than those in conventional ILsmembrane. It is anticipated that these amine-functionalized SPILMs can provide alternative insight for the se-lective separation of CO_(2) and H_(2)S from CH_(4) .

Extraction of Amino-J Acid from Waste-water by Emulsion Liquid Membrane

The emulsion liquid membrane technique was used to extract amino-J acid from industrial dye waste-water.The effects of stirring speed,ratio of the emulsion to water(Rew),ratio of the oil to internal phase(Roi)and membrane phase components on the extraction rate were investigated and optimized.The results showed that the extraction rate of amino-J acid approached 97% when the stirring speed was 300 r/min,Rew 1:6,Roi 1:1,trioctylamine(TOA)3 mL/100 mL kerosene,and methyl?didecyle?alcohol?acrylate(LMA-2)3 g/100 mL kerosene,respectively.The extraction rate had not changed with the oil phase reused for times.

Enrichment of Trace Cerium by Liquid Membrane and Its Determination by Spectrophotometry

Introduction Since it was discovered in 1968,liquid membrane separation technique has been widely studied,particularly in separating or recovering some metal ions.It is a novel study that trace substances in analytical chemistry are enriched by liquid membrane.There have been few reports on enriching cerium by emulsion liquid membrane (ELM) now.Therefore,authors studied the liquid membrane methed for enriching trace cerium.The sensibility measuring cerium by spectrophotometry was increased greatly.

新型乳状液膜萃取RE(Ⅲ)动力学条件研究

稀土元素间电子层结构和物理化学性质极其相似,导致其难以分离,因此,稀土元素萃取分离一直是稀土冶金的研究热点问题。研究了以6%D2EHPA为流动载体、5%T154为表面活性剂、3.0mol/LHCl溶液为内水相、磺化煤油为膜溶剂,控制相比(Roi)为1.5制备一种新型乳状液萃取剂。通过用该乳状液萃取剂在硫酸体系下分别萃取La^(3+)、Ce^(3+)、Sm^(3+)、Eu^(3+)、Ho^(3+)和Er^(3+)6种稀土离子,确定了乳状液膜法(ELM)萃取RE(Ⅲ)的最优动力学条件。结果表明:最优动力学条件为乳化时间5min,萃取时间6min,乳水比(Rew)0.5,萃取温度25℃,外水相为稀土元素水溶液;该条件下,La^(3+)最高萃取率为99.92%,最大富集比为3.33,传质速率k=9.35×10^(-10)m/s,ELM对低浓度La^(3+)溶液表现出优异的萃取性能和富集效果。

液膜法处理硫普罗宁废水的研究

采用Ｗ/Ｏ型乳状液膜法提取水溶液中的硫普罗宁,考察了载体、温度、硫普罗宁浓度以及油内比、试剂比、乳水比对提取率的影响．并得出了液膜法提取硫普罗宁的最佳乳液配方:油内比＝１:１,乳水比＝１:２,试剂比＝６－８,载体浓度＝５%,温度２０℃,转速＝２４０－２５０ｒ·ｍｉｎ－１,其提取率高达９０%．

乳状液膜法迁移及分离铬(Ⅵ)的研究

本文采用以叔胺N7301为流动载体、兰113A为表面活性剂、煤油为膜溶剂、NaOH作内相试剂的乳状液膜体系迁移分离铬(Ⅵ).研究了其迁移机理,确定了适宜制乳、迁移分离及破乳等有关条件,实验表明,不同浓度的含铬(Ⅵ)水样经液膜处理后,其含铬(Ⅵ)量均降至0.5μg·ml^(-1)以下,低于国家排放标准.

乳状液膜分离技术的发展与应用

乳状液膜分离技术综合了固体膜分离法和溶剂萃取法的特点,是一种新兴的节能型分离手段。介绍了乳状液膜的组成和分类,并对其传质机理和分离过程中的影响因素进行了分析。对乳状液膜在废水处理和冶金工业方面的应用进行了具体介绍。

用双硫腙作为流动载体的乳状液膜迁移Pb^(2+)、Zn^(2+)、Cu^(2+)的研究

乳状液膜分离技术已经在许多领域中应用,在液膜中加入流动载体,可促进物质的迁移.本文从萃取剂中筛选出来双硫腙,可作为铅、铜离子迁移的优良流动载体.用双硫腙-Span 80-甲苯的乳状液膜体系,在20～30min试验中,铅、铜的迁移率均接近100％,而在同样条件下,锌不迁移,因此,用该乳状液体系可分离铅、铜和锌.

液膜法分离富集对氨基酚

A study on separation and enrichment of p aminophenol from aqueous solution with emulsion liquid membranes has been carried out The effects of pH in internal aqueous phase, the concentration of the carrier and surfactant were examed Under the optimal operation conditions, the experimental results show that the water treated attained the drainage standard when the concentration of p aminophenol is 500mg·L -1 , after dealing with two stage liquid membrane

乳状液膜法分离富集废旧镍镉电池中的镉

该文介绍了乳状液膜法分离富集废旧镍镉电池中的镉离子。乳状液膜主要由溶剂(煤油)、表面活性剂(Span80)、载体〔二(2-乙基己基)膦酸,P204〕和内水相氨水组成。对影响镉离子渗透和分离过程的重要变量进行了考察,分析了乳状液膜的载体体积分数、外水相pH、搅拌时间、乳水比(乳液与外水相体积比)及Span80体积分数对镍镉分离效果的影响,从而选择出最佳的分离条件为:φ(P204)=4.4%,φ(Span80)=8.8%,pH=5.5,乳水比0.5,搅拌时间10min。用此乳状液膜进行100L反应釜的工业放大实验,镉的迁移率可达93.3%,而镍的迁移率仅为14.6%。

乳化液膜提取柠檬酸及其溶胀的研究

本文研究了采用Ｗ／Ｏ型乳化液膜提取水溶液中的柠檬酸，同时研究了柠檬酸提取过程中水的传质行为（乳液溶胀）。考察了表面活性剂、载体、反草剂Ｎａ２ＣＯ３、柠檬酸浓度对柠檬酸传质和乳液溶胀的影响。实验结果表明：革取率随载体和内相试剂浓度的增加而增加；当载体和初始柠檬酸浓度较高时，乳液更易于溶胀，由此得出了除渗透压造成的乳液溶胀外，溶质与载体形成的络合物也能促成乳液的溶胀。提出了分离浓缩柠檬酸的最佳乳液配方。开辟了发酵产物中有机酸提取工艺的新途径。

乳状液膜法分离钨钼的研究弱碱性体系

进行了以氯化甲基三烷基铵（Ｎ２６３）为载体的乳状液膜在弱碱性条件下分离钨、钼的研究．利用钨、钼形成同多酸能力的差异，通过载体选择性迁移钨来分离钨、钼．考察了影响钨、钼分离的各种因素，得到了分离钨、钼的最佳操作条件．按某厂生产仲钨酸铵的料液中含钼８．９×１０－４ｍｏｌ／ｄｍ３计算，经一级间歇式分离即可降至１．６×１０－４ｍｏｌ／ｄｍ３达到要求（含钼低于２．１×１０－４ｍｏｌ／ｄｍ３）

乳状液膜分离技术中的交流高电压破乳器

近20年来,国内外有关乳状液膜研究的结果表明,该技术实现工业化的关键在于设计并制造出具有最佳破乳效果的电破乳器。已有的关于乳状液膜电破乳技术的报道大都限于小型实验室装置,尚无成熟的定量设计方法。本文将结合高电压破乳器的平板电容模型,给出一种比较简单的设计方法。 2

乳化液膜法处理含Cr(Ⅲ)废水

The transfer behavior of Cr（Ⅲ） through the emulsion liquid membrane system of TBP-Span80-atoleine -kerosene was studied.The effects of membrane phase component, pH value in external phase, concentration of H2SO4 in internal phase,ratio of emulsion-water （R ew）and coexisting ions on the transport rate of Cr（Ⅲ） were investigated.The results showed that the transport rate of Cr（Ⅲ）could reach 99.5% under the optimun conditions of 7%TBP, 5%Span80, 4% atoleine, 84%kerosene, 1.0 mol·L -1 H2SO 4 in internal phase and pH 3.5 in external phase.This method was applied to the treatment of Cr（Ⅲ） waste-water, and the residual concentration of Cr（Ⅲ） could be reduced to 1.0 mg·L -1 ,which was below the national standard of waste-water discharge.

乳状液膜法分离高钼低钨料液中钨钼的研究

根据钼资源利用中钼料液含少量钨的具体实际，对此类高钼低钨料液采用以三烷基氧化膦（ＴＲＰＯ）为载体、ＮａＯＨ为反萃试剂的液膜体系来分离钨钼考察了影响钨钼分离的诸因素，得到了分离钨钼的最佳操作条件在此条件下，钼的浓度为００５２１ｍｏｌ／Ｌ，ＷＯ３与Ｍｏ的质量分数为１０％的料液经一级间歇液膜过程。

乳化液膜技术分离提取Cu^(2+)的应用研究进展

乳化液膜技术是一种新型的分离提取技术.综述了乳化液膜技术在含铜废水处理、从铜矿石堆浸液中回收铜、湿法冶金中除铜以及痕量铜的富集与测定中的应用研究进展.目前,乳化液膜技术分离提取Cu2+仍处于试验研究阶段,但近年来的应用研究表明,该项技术在分离提取Cu2+方面具有广阔的应用前景.

乳状液膜法迁移及分离钯(Ⅱ)的研究

本文采用以叔胺Ｎ７３０１为流动载体、ｓｐａｎ８０为表面活性剂、煤油为膜溶剂、ＥＤＴＡ作内相试剂的乳状液膜体系迁移分离钯（Ⅱ）。确证了其迁移机理。实验表明在所筛选出的适宜制乳及迁移分离等最佳条件下，９６％以上的Ｐｄ（Ⅱ）迁入内相，并能有效地与Ｃｕ２＋、Ｚｎ２＋、Ｃｄ２＋、Ｐｂ２＋、Ｎｉ２＋、Ｆｅ２＋等离子分离。