石化制氢装置水回收利用试验研究

介绍了"争光"牌大孔强酸阳树脂ZGC151-Ⅱ和大孔强碱阴树脂ZGA451-Ⅱ两种树脂在扬子石化冷凝水回收利用试验中的使用情况.试验结果表明,利用树脂的吸附和交换作用可达到冷凝水回收利用的目的,出水达到一级除盐水标准.     

离子交换树脂 四

③巨孔度(maclopolality)——巨孔度或称微小球间的多孔度离子交换树脂的基础母体,由微小球的凝集所形成1个球状粒子时,由微小球粒子的集块生成的空间容积。也有称为巨孔,意味着真的多孔性。 MR形(巨孔形)的离子交换树脂是具有上述的3种类的多孔度。MR形的离子交换树脂的物理及化学的各种性质是极好的。 又MR形离子交换树脂若与同样的水分保有能力的凝胶形离子交换树脂相比较,物理强度大。其理由是MR形离子交换树脂在离子交换时生成的粒子内部的压力可由细孔所吸附,凝胶形离子交换树脂中是没有这样     

大孔树脂吸附技术及其应用

大孔吸附树脂是一类具有网状孔径结构的聚合物,于20世纪中后期开始得到发展,是离子交换技术研究的进一步提升。主要综述了大孔吸附树脂使用原理和影响因素,以及在工业废水处理、医药生产和天然物生成中的应用。同时,对大孔吸附树脂在实际生产中的不足进行讨论。     

利用树脂交换法处理二甲胺废水的研究

对Ls-40型大孔吸附树脂和D113型离子交换树脂对二甲胺的吸附效果研究,分为小试实验和中试实验两部分。实验结果表明：Ls-40型大孔吸附树脂和D113型离子交换树脂的静态吸附量大、再生稳定性高,洗脱液流速对吸附能力影响大,再生液盐酸回流脱附比直接脱附效果好,脱附液盐酸的浓度过大将减弱脱附。     

离子交换树脂固定床催化合成松油醇

用大孔磺酸型阳离子交换树脂固定床作催化剂,连续循环催化蒎烯水合制松油醇,收率可达95.2％,不需用无离子水,树脂不发生磨损。     

大孔弱酸阳离子交换树脂性能改进

选用混合单体甲基丙烯酸甲酯－丙烯腈、混合交联剂二然苯－三烯丙基异三聚氯氰酸酯、混合致孔剂甲苯－汽油和混合此发剂偶氮二异丁腈－过氧化苯甲酰，经悬浮共聚、稀酸工艺可制得一种性能优良的大孔丙烯酯系弱酸最离子交换树脂，使该类树脂的性能得到改进和提高。     

大孔树脂在高纯过氧化氢生产中的应用

研究了抗氧化性较好的大孔吸附树脂和大孔阴阳离子交换树脂生产高纯过氧化氢的方法。通过实验选择了D990 4作为脱除有机物的树脂 ,在 8BV/h的流速下 ,总有机碳 (TOC)净化度为 88.7%。通过电感耦合等离子直读光谱仪 (ICP)分析离子含量的变化 ,考察了大孔阴阳离子交换树脂的净化效果。在 8BV/h的流速下 ,ICP检出物总净化率达 98.5 % ,总P去除率大于 99.9% ,可满足电子工业的需要。     

“D001 大孔离子交换树脂”国标简介

D001大孔强酸性苯乙烯系阳离子交换树脂是我国目前在大孔树脂生产中产量较大、质量稳定的品种。其比表面积大、强度高、交换速度快，有良好的抗污染性能，在水处理、湿法冶金和有机催化等行业大量使用。该产品在国内有多年的生产历史，生产厂家也逐渐增加，其应用场合也越来越多。该产品尚没有国际标准和国外先进国家标准，国内、外各有关生产厂均按企业标准生产。我国从80年代中期开始陆续制定了一套较完整的试验方法国标及某一些牌号的产品标准，并根据生产和使用要求，1994年开始制定此标准。标准由沈阳有机化工厂负责起草，杭州争光比…     

大孔弱碱性吸附树脂在对羟基苯甘氨酸母液处理中的应用

研究了D 301大孔弱碱性离子交换树脂提取对羟基苯甘氨酸母液中对甲苯磺酸（p-TSA）的方法,包括上柱液浓度、吸附温度、洗脱剂的确定和树脂的稳定性,并测定了回收的p-TSA的质量。     

大孔阳离子交换树脂催化合成丙氨酸乙酯盐酸盐

本文介绍以大孔强酸性阳离子交换树脂为催化剂,合成丙氨酸乙酯盐酸盐。研究了催化剂种类及用量、酸醇比、反应时间等因素对反应的影响,取得了良好的结果。     

离子交换法的发展趋势及应用

离子交换法是利用离子交换剂与溶液中的离子发生交换作用而使离子分离的方法。如今,离子交换分离技术取得了突飞猛进的发展,成为了现代各个工业中净化与分离的中流砥柱。阐述了离子交换分离法的发展以及最新的应用进展,从重金属污水处理、食品工业、医药卫生以及清洁能源等方面综合阐明离子分离技术以及离子交换树脂在诸多领域中的重要作用。     

离子交换法制取高纯度黄腐酸的研究

采用强酸性苯乙烯系阳离子交换树脂和大孔苯乙烯系螯合树脂相结合的方法制取高纯度的黄腐酸,探讨了离子类型、交换时间和树脂用量对FA纯度的影响,分析了离子交换机理。结论:粗FA溶液依次通过1个001×7 Na~+型、2个D751 Na~+型、1个001×7 H~+型树脂柱,其中001×7型流速1.5 m L/min左右,D751型流速1.5 m L/min左右,FA纯度达99%以上。     

亚硫酸氢镁预处理麦秆废液中同步分离木质素磺酸盐和低聚木糖的方法研究

分别采用有机溶剂萃取法、超滤法、大孔树脂吸附法、离子交换法分离提取亚硫酸氢镁预处理麦秆废液中的木质素磺酸盐和低聚木糖。研究结果表明超滤法不能达到分离目的,有机溶剂沉淀和大孔树脂吸附可实现木质素磺酸镁的纯化,采用D380离子交换树脂进行离子交换层析可将废液中低聚木糖和木质素磺酸镁完全分离,回收所得低聚木糖和木质素磺酸盐纯度分别可达63.95%和91.28%。因此,D380树脂固定床离子交换法是一种简单有效的提取废液中高附加值产品的方法,可实现亚硫酸氢镁预处理麦秆废液的高值化利用,具有强劲的市场应用潜力。     

大孔磺酸树脂负载AlCl3固体超强酸催化剂的制备

以Ｄ７２和Ｄ６１大孔磺酸型树脂及无水Ａ１Ｃ１３为原料,采用液固法进行络和反应制备了固体超强酸催化剂,对多种影响因素进行了考查,并进行了酯化应用研究。温度７８℃和干燥时间３０ｈ、反应时间６ｈ的条件下,该催化剂铝含量可达２．７８％（质量分数）。催化酯化结果表明该催化剂对部分羧酸酯化反应具有较好催化作用。     

Purification of glycerol/water solutions from biodiesel synthesis by ion exchange: sodium and chloride removal. Part II

BACKGROUND: Equilibrium studies were carried out with the aim of finding the basic design parameters for ion exchange plants using a glycerol phase obtained from biodiesel production. The uptake of sodium and potassium ions on a strongly acidic ion exchanger, Amberlite IR‐120, in the proton form from glycerol/water mixtures has been studied. The effect on the selectivity towards sodium of the percentage of water in glycerine/water mixtures on the macroporous resin Amberlite 252 has been analyzed. Finally, chloride removal by a strongly basic anionic‐exchange resin Amberlite IRA‐420 at three different temperatures has been studied. RESULTS: The strongly acidic ion exchanger Amberlite IR‐120 exhibits higher selectivity for potassium versus sodium ions. The ideal mass action law model was able to fit the experimental equilibrium data. The equilibrium data obtained at different percentages of water in the glycerine/water mixture indicate that as the water content increased the resin selectivity for sodium uptake is reduced. The selectivity of the anion exchange resin Amberlite IRA‐420 for chloride ions decreases with temperature. The ideal mass action law was accurate enough to fit the equilibrium data of the three systems and allowed the equilibrium thermodynamic properties to be obtained. CONCLUSIONS: These results confirm that macroporous resin Amberlite 252 could be a good choice to remove sodium ions from glycerol/water solutions with a high salt concentration and also that a strongly basic anionic‐exchange resin could be used for chloride removal. Copyright © 2009 Society of Chemical Industry     

Evaluation of a Bidisperse Pore Model for Ion Exchange Kinetics in Porous Media

A previously published bidisperse pore model that considers in turn ion interdiffusion in macro- and micro-pores as competitive and step-by-step processes was evaluated. The ion exchange rate of H⁺/Ni²⁺ on gel and macroporous strong acid resins was measured under conditions favoring a particle diffusion controlled mechanism. The interdiffusion coefficients were obtained using a bidisperse pore and quasi-homogenous resin phase kinetic models, respectively. The overall rate of H⁺/Ni²⁺ exchange on the macroporous resin is lower than in the gel resin. It was shown that ion interdiffusion in the micropores of the porous resin could also be important.     

氟化树脂催化异丁烯水合反应研究

通过对强酸型大孔离子交换树脂氟化处理,用氟气以一定速度通过树脂层,从而生产出氟化树脂。氟离子与磺酸基紧密结合,减少磺酸基团的脱落,从而提高树脂的热稳定性能。将该催化剂用于异丁烯水合合成叔丁醇中试装置进行水合反应,结果表明:水合反应转化率大约提高10%～20%,出水电导率降低1/3～1/2,说明催化树脂经氟化后可以大大地提高磺化树脂的耐温性能,磺酸基不易脱落,从而拓展了催化树脂的应用范围。     

Development of a Modified Ion Exchange Resin Column for Removal of Gadolinium From the Moderator System of PHWRs

Gadolinium is used as neutron poison in Pressurized Heavy Water Reactors (PHWR) at 15 ppm concentration during emergency shut down and at 2 ppm during start up of the reactor. The pH_a range of 5–5.5 is recommended based on the acidity requirement for maintaining gadolinium in the solution and to minimize corrosion of moderator system structural materials and radiolysis. Gadolinium has to be progressively removed as the reactor goes to power. It has been observed that gadolinium precipitates in the purification system consisting of ion exchange columns. Experimental investigations were carried out to understand the phenomenon of precipitation of gadolinium in the weak base ion exchange resin. Attempts were made to selectively cap the strong base groups in weak base resin with nitrate to prevent precipitation of gadolinium. Based on studies carried out on gadolinium pick-up and radiation decomposition of weak base anion exchange resins, a simple mixed resin column consisting of nitrate treated poly acrylic based macroporous weak base resin and a strong acid cation exchange resin has been recommended for the removal of gadolinium. It does not precipitate gadolinium and gives optimum chemistry parameters in the outlet.