聚丙烯酸酯阴离子交换树脂分离EDTA形成配合物

稀土元素与EDTA形成配合物Ln(edta)，在阴离子交换树脂的作用下，稀土元素与EDTA有明显不同的结合性。使用强碱性的凝胶和大孔径聚丙烯酸酯阴离子交换树脂：Amberlite IRA 458和Amberlite 958；以及弱碱性凝胶聚丙烯酸酯阴离子交换树脂：Amberlite IRA-68对Nd^3 与EDTA形成的配合物中吸收和层析出Y^3 进行实验研究。实验表明，弱碱凝胶聚丙烯酸酯阴离子交换树脂Amberlite IRA-68比强碱凝胶聚丙烯酸酯阴离子交换树脂更有效。     

213和201×7阴离子交换树脂抗水中有机污染物性能的对比研究

本文对丙烯酸系213阴离子交换树脂和目前常用的苯乙烯系201×7阴离子交换树脂进行抗有机物污染性能的对比研究，研究主要集中在树脂对水中有机物的吸附能力、水通过树脂后的有机物含量及污染后树脂的复苏解析能力这三个方面。结果表明，213树脂抗有机物污染性能较好。     

阴离子交换树脂热降解性能试验研究

本文报导了五种不同品种阴离子交换树脂，在６０℃和７０℃下热降解性能试验，结果证明大孔强碱Ⅰ型阴离子交换树脂的耐热性能最佳，这为高温凝结水净化处理选用树脂，提供了依据。     

阴离子交换树脂再生型率和碳酸型率测定方法的研究

阴离子交换树脂的再生型率和碳酸型率是表征阴离子交换树脂的重要技术指标,文章在改进和优化ASTM D2187方法的原理和检测步骤的基础上,介绍了一种新的阴离子交换树脂再生型率和碳酸型率测定方法。该方法原理科学,适用范围广,重复性好,检测精度高,可操作性强,可用于再生型阴离子交换树脂、运行中及再生后的阴离子交换树脂的检测。     

离子交换水处理技术文摘

标题的装置包括装有预涂中空纤维的过滤器的过滤一脱盐箱，一个装填离子交换树脂的柱塔，用于监测徨水电导率或CL~-浓度的装置和依靠来自监测器的反馈信号来控制离子交换树脂数值的装置。阴离子交换树脂对阳离子交换树脂的数值的装置。阴离子交换树脂对阳离子交换树脂的混合比例控制在>0.5:1,离子交换树脂的平     

阴离子交换树脂骨架结构对吸附单宁酸与五倍子酸的影响

选用聚丙烯酸系D730、FPA98和聚(苯乙烯-二乙烯苯)系的D201强碱型阴离子交换树脂作为吸附剂,系统研究单宁酸、五倍子酸在上述3种阴离子交换树脂上的吸附行为与机理。吸附等温线表明,聚丙烯酸系阴离子交换树脂对单宁酸的吸附性能优于聚苯乙烯-二乙烯苯系阴离子交换树脂,而聚(苯乙烯-二乙烯苯)系阴离子交换树脂对五倍子酸有较高的吸附容量。虽然3种阴离子交换树脂对单宁酸的吸附均为熵推动的自发吸附过程,静电引力是主要吸附作用力,但是在吸附过程中除离子交换作用外,D730和FPA98骨架上的羰基与单宁酸有较强的氢键作用,而D201骨架上的苯环与五倍子酸也存在着"π-π"共轭作用,从而提升离子交换树脂对鞣酸类物质的吸附性能。因此,影响离子交换树脂吸附性能的不仅是交换容量,其骨架结构对吸附性能也有较大影响。另外,上述吸附作用也会影响树脂吸附饱和后的脱附性能,相比较聚(苯乙烯-二乙烯苯)系强碱型阴离子交换树脂,聚丙烯酸系强碱型阴离子交换树脂有更好脱附性能。     

氨基酸的提纯方法

本发明提供一种从氨基酸的碱金属盐的水溶液中提纯氨基酸的方法，所述方法包括下列步骤：（1）阳离子交换步骤，其中，用包含阳离子交换树脂的移动床式连续离子交换装置对氨基酸的碱金属盐的水溶液进行脱盐提纯处理，以得到粗氨基酸的水溶液；（2）阴离子交换步骤，其中，用弱碱性阴离子交换树脂从所得的粗氨基酸的水溶液中吸附除去作为共存的副产物的亚氨基二羧酸，并且甚至在对所述亚氨基二羧酸的吸附达到所述弱碱性阴离子交换树脂的突破点之后，仍使所述粗氨基酸的水溶液流过。     

羧酸在笼形聚偕氨肟树脂上吸咐

碱处理笼形聚偕氨肟树脂（BCAO）对羧酸表现出强的吸附能力。一元羧酸在BCAO树脂上以多层吸附为主要特征。二元和三元羧酸则以单层吸附占优势。后者可能是以双阴离子的一个负极吸着在BCAO树脂表面，形成了对其他羧酸阴离子起排斥作用的负离子场。另外，双阴离子也有可能和两个氨基结合形成次级交联，妨碍着其他离子迁移和扩散。     

弱碱性离子交换树脂在柠檬酸提炼中的应用

本文选用多种弱碱性阴离子交换树脂，去除柠檬酸酸解液中、Ｃｌ－等阴离子，比较其交换容量、柠檬酸的回收率、再生性能、机械强度等。实验表明：Ｄ３１５弱碱性树脂的效果明显优于其它几种树脂。     

高吸附量树脂清除胆汁酸的研究

大孔吸附树脂及阴离子交换树脂对胆汁酸均有较好的清除作用。其中ＮＫ－１１０吸附树脂吸附量大，吸附速度快，经交联聚乙烯醇包膜后，该树脂不仅保持了对胆汁酸的高吸附量，而且具有良好的血液相容性。     

聚合物支载硼氢根阴离子交换树脂I_2系统还原羧酸的研究

本文采用聚合物支载硼氢根阴离子交换树脂／I2系统还原羧酸类化合物，发现它具有很好的还原选择性和还原效果，并对影响该反应的条件如温度、溶剂进行了讨论。     

The Reduction of Aromatic Aldehydes to Hydrocarbons with Borohydride Exchange Resin (BER)-Nickel Acetate in Methanol

Aromatic aldehydes were reduced to the corresponding hydrocarbons with borohydride exchange resin (BER) - nickel acetate in methanol in excellent yields.     

THE TRANSITION METAL COMPOUNDS CATALYZED BOROHYDRIDE EXCHANGE RESIN TO REDUCE THE AROMATIC NITRO COMPOUNDS

Aromatic nitro compounds are reduced to correspouding amiues inethanol by borohydride exchauge resin(BER)in the presence of transition metalPd,Co,Ni,Cu)compounds as catalysts.     

The Reduction of Aromatic Oximes to Amines with Borohydride Exchange Resin-Nickel Acetate System

Aromatic oximes were reduced to the corresponding amines with borohydride supported on an ion exchange resin (BER)- nickel acetate in methanol in good yields. The isolation of pure products by simple filtration and evaporation is an important feature of this method.     

Convenient One-Pot Synthesis of β-Alkylthio Acid Derivatives from Thioacetates and the Corresponding α,β-Unsaturated Compounds

Various β-alkylthio acid derivatives were prepared conveniently from thioacetates and α,β-unsaturated compounds through borohydride exchange resin (BER)-Pd catalyzed transesterification of thioacetates to the corresponding thiols and Michael addition of the resulting thiols to α,β-unsaturated compounds.     

Use of a chiral surfactant for enantioselective reduction of a ketone

The influence of a chiral surfactant and a polymer-supported chiral additive on reduction of ketones using sodium borohydride will be described. Initial preparations involved methylation of (S)-leucinol to give (2S)-N , N-dimethyl-2-amino-4-methyl-1-pentanol (1) (67%). The chiral surfactant (2) was synthesized by reacting (1) with bromohexadecane (71%). The functionalized styrene for the polymer-supported chiral additive (5) was synthesized by reacting (1) with 4-vinylbenzyl chloride. Polymerization was carried out with 10% of the functionalized monomer (4), 5% cross-linking agent divinylbenzene, and 85% styrene with AIBN as the initiator. The activity of the chiral surfactant and polymeric additive were examined by using them as additives in a standard reduction of 2-pentanone with sodium borohydride to yield (R)- and (S)-2-pentanol (3) (20%). The resulting alcohol was analyzed by polarimetry (ee 9.5%) and also esterified with (2S)-methylbutyric acid prior to characterization by NMR. 13C NMR indicated an enantiomeric excess of 5.2% when the chiral surfactant was used, and 7% when the polymeric additive was used.     

Hydrophilic polymer-immobilized lipoamides-iron(II) system as a new reducing catalyst for the reduction of O-benzylhydroxylamine by sodium borohydride

Based on a redox function of 1,2-dithiolane ? 1,3-dithiol, lipoamide immobilized on hydrophilic polymers such as polyacrylamide, polyethyleneimine, and chitosan was found to work as polymeric reducing catalysts for the reduction of O-benzylhydroxylamine to benzyl alcohol and ammonia with sodium borohydride in the presence of ferrous ion. These polymers were easily separable and maintained high reactivities even after repeated uses.     

BER催化还原一些含氮功能基化合物的研究

用强碱性阴离子交换树脂制备了硼氢阴离子交换树脂还原剂(BER),使其在氯化铜等金属化合物的催化下还原一些芳香硝基、氰基、氮氮双键等含氮功能基化合物.还研究了BER的制备条件:如温度、溶剂、不同金属化合物对还原反应的影响,并初步探讨其反应机理.     

A greener organic chemistry experiment: reduction of citronellal to citronellol using poly(methylhydro)siloxane

Abstract

An undergraduate organic chemistry experiment based on literature reports in which the aldehyde functionality of citronellal is reduced to the primary alcohol is reported. The reducing agent, poly(methylhydro)siloxane (PMHS), is activated via a catalytic amount of fluoride. This polymeric reducing agent can be introduced as a safer, and thus, greener, alternative to sodium borohydride in the undergraduate laboratory setting, as PMHS is stable to air and water. The execution of this experiment requires standard organic chemistry techniques and the reduced substrate is analyzed via IR spectroscopy.     

Stability of aqueous-alkaline sodium borohydride formulations

Stability of sodium borohydride in the form of concentrated solutions and suspensions and solids corresponding to a crystal hydrate in composition was studied. The effects of temperature, concentrations of sodium borohydride and alkali, and nature of alkali metal cation on the rate of sodium borohydride hydrolysis were studied.