阴离子交换树脂催化丙烯腈与二醇的Michael加成反应

利用阴离子交换树脂为催化剂进行了丙烯腈与二醇的Ｍｉｃｈａｅｌ加成反应的研究，对影响反应的诸因素进行了讨论，产物收率为７０－９０％。     

无水AlCl3催化合成N-乙基-N-氰乙基苯胺的研究

本文报道了用无水A lC l3作催化剂,催化N-乙基苯胺与丙烯腈反应合成N-乙基-N-氰乙基苯胺的新工艺,优化得到其合适的反应条件是:加入N-乙基苯胺重量的10%的无水A lC l3,在80℃左右反应6-8小时,可使反应的转化率达98.5%,收率达97%以上。     

强碱阴离子交换树脂催化合成羟丙腈

使用强碱阴离子交换树脂作为丙烯腈 (AN) 水合反应的催化剂制备羟丙腈 (HPN)。考察了反应时间、温度、催化剂类型、催化剂用量及投料比对羟丙腈产率的影响。优化的反应条件为: 温度50℃，时间6h，催化剂用量/丙烯腈 (wt) 取1.5∶1，丙烯腈/H2O (wt) 取11∶6，催化剂为201×7。在此条件下羟丙腈的摩尔产率达85%，催化剂经重复使用12次，活性没有降低。     

Friedel-Crafts酰基化法制备聚苯乙烯型阴离子交换树脂

提出了一种合成聚苯乙烯型阴离子交换树脂的新方法：通过Ｆｒｉｅｄｅｌ－Ｃｒａｆｔｓ酰基化反应在交联聚苯乙烯上引入乙酰基，然后经溴化、胺化反应制备阴离子交换树脂。该方法避免了使用氯甲醚等致癌物质，并消除了二次交联等副反应。讨论了溶剂，催化剂，试剂和反应温度及时间等因素对各步反应的影响。测定了产物的基本性能并对所得结果进行了讨论。     

强碱性阴离子交换树脂催化菜籽油酯交换反应合成脂肪酸甲酯

以强碱性阴离子交换树脂作为催化剂,催化菜籽油与甲醇酯交换反应制备脂肪酸甲酯(FAME)。结果表明,产品收率随着醇油比增大而提高,当醇油比(V/V)达到7.21后,收率增加逐渐变慢;在树脂最高使用温度以下,反应温度越高,产品收率越高;产品收率随催化时间增长而提高,但提高速度逐渐趋缓;催化剂活性稳定,利用再生树脂连续催化28.7h,未见活性下降。常压下,醇油比4.54,60℃下反应54.7min,FAME产品收率达96.80%。     

阴离子交换树脂的合成及其脱色性能

为了改进提取甜菊甙(糖)所用的阴离子交换树脂的脱色能力和抗污染能力,作者选用合适的致孔剂进行苯乙烯、二乙烯苯和极性单体的多元悬浮共聚,然后进行氯甲基化和胺化,合成了多种阴离子交换树脂。与D280树脂相对照进行树脂性能测试,筛选出了对甜菊甙脱色容量较大和再生效果较好的E—04树脂。     

耐高温强碱阴离子交换树脂研究进展

羟型强碱阴离子交换树脂的最高使用温度一般为60□,三菱化学公司研究制备了能耐受100□高温的强碱阴离子交换树脂.本文对近年来强碱阴离子交换树脂在热稳定性方面的改进及提高做简要概述.     

阴离子交换树脂D-268脱色性能研究

作者通过对大量树脂的筛选，寻找到了性能优良的脱色树脂D-268，详细研究了D-268树脂的脱色性能和不同再生剂对树脂的再生性能。     

阴离子交换树脂提取谷氨酸

谷氨酸是蛋白质的主要构成成分,具有重要的生理生化功能,其主要应用于食品、医药等工业。目前国内从发酵液中提取谷氨酸普遍采用的步骤是:先用等电法结晶大部分谷氨酸,等电母液采用离子交换法浓缩其中的谷氨酸,此时谷氨酸为阳离子,洗脱高浓度馏分再回入等电罐进行结晶回收[1]。上述工艺的最大缺点是:在结晶和离子交换过程中要使用大量的硫酸调节发酵液和母液的pH,造成环境污染;且提取谷氨酸后产生的废液中其COD和SO2 4和氨态氮含量很高,用常规的方法较难处理[2]。由于谷氨酸发酵液的pH为6 8～7 2,此时,谷氨酸主要以阴离子状态形式存…     

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。     

耐高温强碱性阴离子交换树脂催化剂的合成及应用

以大孔苯乙烯-二乙烯基苯共聚白球和1,3-噁嗪-2-酮为原料,烷基化、叔胺化和季铵化后得含有长碳链间隔臂的强碱阴离子交换树脂催化剂.用IR、EDS、HR/MAS表征了树脂的结构,测定了热稳定性和催化环氧乙烷水合的性能.OH-型树脂在100℃去离子水中720 h交换量下降率为11.8%.HCO3-型树脂在90℃、1.8 MPa、空速0.17 h-1,水与环氧乙烷比6.4的条件下,催化EO水合转化率98%,MEG选择性95%,200 h后交换量下降率小于2%.     

大孔阳树脂催化合成苯乙酸酯

利用Ｄ７２，Ｄ６１大孔阳离子交换树脂为催化剂，催化合成苯乙酸异戊酯、苯乙酸丁酯、苯乙酸苄酸、苯乙酸苯乙酯、苯乙酸茴香酯。对影响反应的诸因素进行了讨论，酯收率为９０％左右。     

离子交换树脂

简要介绍了离子交换树脂的概念、发展简史、组成、分类、作用原理、合成路线及性能。用表格简列出应用的各个方面,并说明了应用的优、缺点,最后扼要地指出了发展的方向。     

Separation of Neutral Amino Acids with Ligand Exchange Resins

Four neutral amino acids (Gly, Ala,.Val and Leu) were separated with ligand exchange resins. The separation capacity of the ligand exchange resins is compared with that of common ion exchange resins. The effects of eluent, column temperature, and central metal ions of the support on the separation are studied. The relationship between matrix structure of resins and their separation capacity is analysed.     

Stable Anion Exchange Membrane Bearing Quinuclidinium for High-performance Water Electrolysis

Anion exchange membranes (AEMs) are core components in anion exchange membrane water electrolyzers (AEM-WEs). However, the stability of functional quaternary ammonium cations, especially under high temperatures and harsh alkaline conditions, seriously affects their performance and durability. Herein, we synthesized a 1-methyl-3,3-diphenylquinuclidinium molecular building unit. Density functional theory (DFT) calculations and accelerated aging analysis indicated that the quinine ring structure was exceedingly stable, and the S_N2 degradation mechanism dominated. Through acid-catalyzed Friedel–Crafts polymerization, a series of branched poly(aryl-quinuclidinium) (PAQ-x) AEMs with controllable molecular weight and adjustable ion exchange capacity (IEC) were prepared. The stable quinine structure in PAQ-x was verified and retained in the ex situ alkaline stability. Furthermore, the branched polymer structure reduces the swelling rate and water uptake to achieve a tradeoff between dimensional stability and ionic conductivity, significantly improving the membrane's overall performance. Importantly, PAQ-5 was used in non-noble metal-based AEM-WE, achieving a high current density of 8 A cm⁻² at 2 V and excellent stability over 2446 h in a gradient constant current test. Based on the excellent alkaline stability of this diaryl-quinuclidinium group, it can be further considered as a multifunctional building unit to create multi-topological polymers for energy conversion devices used in alkaline environments.     

强碱阴离子交换树脂多相催化油脂的酯交换

催化剂;酯交换;强碱阴离子交换树脂多相催化油脂的酯交换     

Functionalized Resins for the Synthesis of Peptide Alcohols

Peptide alcohols are clinically important compounds that are underexplored in structure–activity relationship (SAR) studies in drug discovery. One reason for this underutilization is that current syntheses are laborious and time consuming. Herein, we describe the preparation and utility of Rink, Ramage, and Sieber-chloride resins, which enables the use of a general, easy and practical method for the attachment of fluorenylmethoxycarbonyl (Fmoc)-amino alcohols to a solid support, in the synthesis of peptide alcohols. This method is the first straightforward Fmoc/tBu synthesis of peptide alcohols starting from a pre-loaded resin. The synthesized peptide alcohols can be detached from the linkers through conventional methods. Treatment with trifluoroacetic acid (TFA) (95 %) and scavengers such as triisopropylsilane and water for 2 h is sufficient to obtain a fully deprotected peptide alcohol, while treatment with 20 % hexafluoroisopropanol in dichloromethane renders a fully protected peptide alcohol that can be further modified at the C-terminus. As examples, the new resins were used in straightforward, relatively rapid syntheses of the peptide alcohols octreotide, alamethicin, and a segment of trichogin GA IV, as well as the first synthesis of stapled peptide alcohols.     

离子交换树脂在分析化学中的应用

简要评述了离子交换树脂在分析化学中的应用。包括离子交换树脂预富集技术从稀溶液中浓缩痕量离子,离子交换树脂相分光光度法测定微量离子,离子色谱在无机分析中的应用,以及离子交换树脂在有机分析与生化分析中的应用。