离子交换膜间水的电离及其应用

电渗析器中淡水室内阴阳离子交换膜间的纯水，可以在直流电场的作用下发生电离，产生H^ 和OH^-离子。通过分析纯水的电离，讨论了普通电渗析(ED)和填充床电渗析(EDI)中水的电离现象及其相关机理。EDI过程中水电离产生的H^ 和OH^-离子可以自再生离子交换树脂。简单介绍离子交换膜间水电离的应用，即已得到产业化的EDI技术和正在推广中的离子交换树脂的电再生技术。     

连续电再生离子交换原理探讨

连续电再生离子交换系统(EDI)将电渗析技术和离子交换技术结合起来,无需酸、碱再生。其工作原理是系统中阴、阳离子交换树脂对水中离子的吸附交换、在电场作用下离子的定向迁移以及离子交换树脂的平衡再生。     

离子交换树脂电再生实验研究

引　言针对目前离子交换树脂酸碱再生工艺中再生药剂利用率低、再生操作步骤繁多、大量废酸碱液的排放对环境造成污染的弊病 ,借助电渗析概念提出了一种新的离子交换树脂再生方法———电再生 ,即利用水电离出的H+和OH- 离子分别再生失效的阳、阴离子交换树脂 .本实验采用单级三隔室离子交换树脂再生装置对电再生进行了研究 .1　混床树脂的电再生实验关于混床树脂电再生 ,人们已经进行了广泛的研究[1～ 6 ] .所谓电再生实质是填充床电渗析法 ,即去离子 (EDI)净水技术 .它的进水条件苛刻 ,要求反渗透处理后出水 ,填充树脂属于再生后树脂 .…     

EDI集成膜技术低成本制超纯水

日前在南开大学了解到。由该校研制成功的吨级规模工业电去离子技术（EDI）制水装置技术已成熟,性能达到国外技术水平．而装置成本却大大降低,使EDI技术广泛应用成为可能。据介绍．EDI技术是国外上世纪90年代才真正成熟的第四代超纯水生产技术。该技术集离子交换和电渗析技术两者的优点于一体,树脂用量极少且自动获得再生,既克服了电渗析和反渗透不能直接制取超纯水的弱点,又避免了使用酸碱再生离子交换树脂。整个过程相当于连续获得再生的混床离子交换。EDI装置无废酸废碱排放,其本身的水利用率最高可达98％。     

电去离子技术在水处理中的应用

电去离子是一种将电渗析与离子交换有机结合形成的膜分离技术,它结合了电渗析连续脱盐和树脂深度净化的特点,并克服了这两种分离技术原有的缺点,具有显著的经济效益、社会效益和环境效益.介绍了EDI技术的去离子原理,回顾了EDI技术的发展历程及其在水处理中的应用现状.     

电去离子技术促进我国药用水生产的发展

电去离子(EDI)技术是结合电渗析和离子交换技术而形成的一种新型膜分离过程。自从20世纪90年代以来，EDI技术已成功地用于药用水生产。介绍了EDI的基本原理和主要特点，通过对23家药厂和医院的调查以及EDI与其他纯水生产技术进行的比较，指出了EDI技术的应用前景。     

电去离子（EDI）高纯水新技术及其研究进展

介绍了EDI过程的脱盐机理,分析并提出了过程的主要强化途径。阐述了EDI的V-I、pH-I特征及“树脂电再生”等特征及其与电渗析（ED）过程的区别。介绍了国内外EDI的研究进展与应用概况。     

发电用连续电去离子膜堆及系统设计创新工艺的探讨

本文通过薄室和厚室制造工艺的比较，概述连续电去离子过程的发展过程，并提出一种创新工艺，用该工艺证实其去离子效率，可与化学再生混床离子交换相媲美。连续电去离子(CEDI，即EDI)是用离子交换膜、电活性介质(通常为离子交换树脂)和直流电势，除去水中已电离的或可电离的物质迁移的过程。为降低费用，同时为提高去离子程度，这一过程自从20世纪80年代末得到产业化以来又得到不断地改进。本文的目的是回顾过去13年的某些进展，并介绍与数年经验相结合的一种创新工艺。     

电去离子法(EDI)处理电镀含铬废水

电去离子法(EDI)是电渗析和离子交换的结合技术.在电渗析淡室中添加离子交换树脂作为阳极室介质,自制了EDI装置,并采用该装置对电镀铬漂洗废水进行处理,研究了进水pH、流量和电流密度对EDI分离效率的影响.结果发现,当进水pH=4.8,流量和电流密度分别为4 L/h和1.2 mA/cm2时,Cr(VI)的分离效率可达99.5％,但淡室出水中的Cr(Ⅵ)浓度略高于国家排放标准.作为一种能够高效分离电镀铬漂洗废水中六价铬的新技术,EDI仍有一些问题需要解决.     

离子交换导电网电渗析的探讨与运行

离子交换导电网电渗析是在离子交换树脂填充床电渗析(1—5)的基础上发展起来的新技术(6—8)。该技术把电迁移、离子交换和电再生三者结合起来,具有pH稳定、淡化水质好,极化结垢小、极限电流密     

Numerical simulation of the electrodeionization (EDI) process for producing ultrapure water

A steady-state model was established to simulate EDI process for producing ultrapure water (MixEDI), the dilute compartment of which is filled with mixed cation and anion-exchange resins. By calculating the mathematical model which includes water dissociation mechanism, ionic status of ion-exchange resin, concentration polarization status and the concentration distribution of water dissociation products are obtained. The influence of water dissociation on the current efficiency, removal rate and pH value of EDI effluent is investigated. The existence of water dissociation catalyst at anion-exchange membrane (AM) makes the water dissociation current of the AM much larger than that of CM. The result is that the amount of electro-regenerated cation-exchange resins is much larger than that of anion resins. This is the reason why the removal rate of salt cation much larger than that of salt anion in EDI for producing ultrapure water. Thus, at the target percentage removal, water dissociation at AM surface is excessive and the one at CM surface is insufficient. We assume that there is also some water dissociation catalyst at CM surface. It is found that the improved water dissociation at CM could increase the percentage removal of salt anions and the current efficiency.     

离子交换树脂电再生技术的研究进展

离子交换树脂的电再生法，只消耗电能，无需酸碱化学药剂，对环境无污染，使用方便，具有良好的环境效益。本文阐述了混床和复床电再生机理，并介绍了目前国内在电再生方面的研究进展。     

离子交换法提取井冈霉素的研究

本文就不同树脂对井冈霉素的吸附性能及其影响因素作了研究，得到了离子交换法提取井冈霉素较佳工艺条件，从而获得了高单位效价的井冈霉素粉剂。     

The Desalting Property of Ion-Exchange Resins in Organic Solvent

The desalting property of ion-exchange resins in organic solvent is reported by using potassium acetate as a model compound. The experimental results show that the solvability of the solvent stirring speed, and temperature are the factors which influence the ion-exchange rate. The increase of solvability, stirring speed and temperature will speed up the ion-exchange process.     

The effect of corrosion particles present in water solutions on the behavior of strong acid cation-exchange resins during the process of cobalt removal

The effect of the presence of corrosion particles on the behavior of different structure types of cation-exchange resins during the adsorption process of ⁶⁰Co from water solutions was studied. Comparative valuation of sorption behavior and capacity of polyreticular and monoreticular structure type cation-exchangers was carried out. It was found that the ion-exchange filtration efficieny depends upon the presence of corrosion particles on the surface of ion-exchange beads and in their pore structure. The cation-exchange process of ⁶⁰Co is affected differently by different structure type ion-exchange resins. The fouling phenomenon caused by iron-corrosion particles during the water clean-up process at a RWCU system in BWR and by CVSE demineralizers in PWR dose not affect negative phenomenon for ion-exchange behavior of ion-exchange resins to remove polyvalent ions from the water. The polyreticular cation exchanger Amberlite 200C can better remove ⁶⁰Co cations from water solutions than the monoreticular (gel type) cation-exchanger Amberlite IR 120. Evidently this is due to the true porous macroreticular structure of the cation-exchange beads. In parallel with the ion-exchange processes, the sorption process of the corrosion products situated on the larger surface area of the true physical pore structure of Amberlite 200C also plays an important role. The information obtained will be very useful to the technological service of nuclear power stations.     

离子交换树脂在有机溶剂中的脱盐行为研究

The desalting property of ion-exchange resins in organic solvent is reported by using potassium acetate as a model compound. The experimental results show that the solvability of the solvent, stirring speed, and temperature are the factors which influence the ion-exchange rate. The increase of solvability, stirring speed and temperature will speed up the ion-exchange process.     

天然水中铅的在线流动注射离子交换预浓集原子吸收测定

本文提出了痕量铅的在线流动注射离子交换预浓集火焰原子吸收测定方法，并将其应用于天然水的分析．文中讨论了不同缓冲溶液、ｐＨ值、富集时间、离子交换树脂对富集效果的影响．     

盐水中的杂质对离子膜的影响

分析盐水中杂质对离子膜的影响,提出从水、硬件、工艺和原盐四方面避免盐水中的杂质对离子膜的影响.     

PolyHIPEs for Separations and Chemical Transformations: A Review

Polymeric foams prepared from polymerizing high internal-phase emulsions (polyHIPEs) provide several distinct advantages over conventional polymer resins for applications in separations as well as chemical transformations, most notably reliance on convective rather than diffusive mass transport. Elimination of the slow diffusion through pores of a typical macroporous resin bead allows for higher throughputs to be achieved using polyHIPE resins. This review will discuss recent examples of polyHIPE materials used in separations applications (metal complexation, ion-exchange, protein purification, chromatography, and oil/water separation) as well as supports for various catalysts (small molecules, nanoparticles, and enzymes) for chemical-transformation applications.