离子交换树脂在1,3-丙二醇生产中的应用

通过静态吸附和动态脱盐实验,研究了离子交换树脂在1,3-丙二醇脱盐中的应用情况。通过静态吸附实验表明,001×7型树脂吸附能力最大,最佳吸附温度为40℃;通过动态脱盐实验表明,001×7型树脂动态吸附量为1740mg/g。通过树脂的成本、处理能力分析,表明001×7型树脂完全可以应用于生产。     

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     

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。     

树脂离子交换提取拜耳法流程中钒的动力学

采用201′7树脂对拜耳法生产Al2O3流程中种分母液沉钒后再浸出,对制得的Na2VO4溶液进行了静态吸附动力学研究,分析了吸附机理. 采用批式离子交换法,考察了树脂粒径、温度、搅拌速率、溶液浓度对离子交换过程的影响,并用动边界模型对树脂吸附钒的离子交换过程进行了描述. 结果表明,离子交换过程由颗粒内扩散控制,搅拌速率和反应温度对交换速率影响较小,吸附速率随Na2VO4溶液中钒初始浓度的增加而升高;交换过程的反应速率常数为10.052 cm4/(mol×s),反应级数n为0.5507,表观活化能为39.67 kJ/mol. 吸附机理分析结果表明,在动力学实验过程中201′7树脂主要吸附的钒阴离子为V10O286-.     

牵线搭桥

上海树脂厂有限公司绿宝树脂上海名牌离子交换阳树脂001×7离子交换阴树脂201×7离子交换阴树脂201×4离子交换大孔阴树脂D301离子交换大孔阴树脂D311离子交换阴树脂331离子交换Ⅱ型阴树脂202离子交换阴树脂D313D751螯合树脂离子交换阳树脂D113离子交换阴树脂D201离子交换阳树脂D001各类牌号的有机硅、环氧树脂和辅料.地址:上海天山路201号     

吸附分离果糖和葡萄糖的基础研究

对国产的四种吸附剂吸附分离果糖和葡萄糖混合物的分离度进行了测定,筛选小了一种较为理想的吸附剂——D001型离子交换树脂;并对该树脂吸附果糖和葡萄糖的有关平衡数据进行了测定,为设计模拟移动床吸附分离装置提供了必要的数据。     

SQD201树脂对钒的吸附-解吸行为及机理

通过静态吸附-解吸实验研究了SQD201树脂吸附-解吸钒的交换平衡和动力学特性,考察了pH值、温度和溶液浓度对离子交换过程的影响. 结果表明,在298 K、pH=2.0、溶液浓度为0.040 mol/L条件下,SQD201树脂的静态饱和吸附量为573.80 mg/g;钒在SQD201树脂上的吸附是吸热过程,符合Langmuir等温吸附方程. 吸附和解吸过程主要受颗粒扩散控制,吸附过程的表观活化能为20.41 kJ/mol,解吸表观活化能为22.21 J/mol. 吸附机理分析表明,SQD201树脂主要吸附的钒阴离子为H2V10O284-,H2V10O284-与树脂的理论摩尔比为1:4.     

连续式密实移动床逆流操作下轴向解吸K+特性

以吸附K+的001′7强酸型阳离子树脂为固体介质,NaCl溶液为解吸剂,在一套密实移动床装置上,采用连续式液固逆流接触解吸方式,在不同操作条件下考察离子交换柱对K+的轴向解吸特性,并与固定床解吸操作模式进行对比. 结果表明,在移动床操作模式下,离子交换柱内单位树脂累积解吸率沿轴向由上至下逐渐升高,在离子交换柱下部1/5区域内增加较快,部分条件下全柱树脂累积解吸率可达90%以上;解吸剂初始浓度在一定范围内增加时,轴向各区域单位树脂累积解吸率增大,但当解吸剂初始浓度增大到一定值后,离子交换柱轴向不同区域会出现解吸与反吸附交替主导的现象;随离子交换柱内解吸液表观流速增大、树脂移动速度和原始吸附量降低,其轴向各区域的单位树脂累积解吸率增加. 在解吸液单程流过离子交换柱的时间内,采用连续式密实移动床的全柱累积解吸率和K+解吸总量比固定床吸附模式高.     

用201×7强碱性阴离子交换树脂回收氰化物

研究了201′7树脂对氰化物的吸附解吸性能,考察了pH值、温度、氰化物浓度等对吸附的影响,确定了最佳吸附条件为：pH 10~11,室温,静态吸附振荡15 min,并选择中性NaCl作为解吸剂,取得了良好的解吸效果. 确定了湿树脂对氰化物的静态饱和吸附容量为25.39 mg/mL,动态饱和吸附容量为27.43 mg/mL. 探讨了201′7树脂对氰化物吸附的热力学及动力学规律,确定了吸附和解吸的速率常数分别为1.01′10-2和2.12′10-2 s-1. 吸附过程符合Freundlish经验等温式. 通过实验初步确定该树脂可用于氰化物回收及处理.     

蛋白质在膨胀床吸附层析剂的静态和动态吸附性能

以牛血清白蛋白 (BSA)为目标蛋白 ,考察膨胀床用离子交换树脂StreamlineDEAE的静态和动态吸附性能 ,并和离子交换树脂DEAESepharoseFF进行比较 ,实验发现两者的静态吸附性能相似 ,而动态吸附性能差别较大。根据动态吸附数据计算出液膜扩散系数和孔内扩散系数。     

EDI用于处理含甲酸废水

在工业生产过程中,排放的废水里含有大量的甲酸。本文以含甲酸废水处理为研究对象,采用自主设计的一级一段电去离子膜堆装置,通过考察I-U、pH-U等特征曲线,研究了离子交换膜、离子交换树脂及树脂填充比例、流速等操作条件对膜堆性能的影响。结果表明：采用异相膜和凝胶型树脂、淡室填充100%阴树脂、淡水流速为2.5 L/h的操作条件,可使EDI膜堆效果最佳;不同甲酸浓度对能耗的影响比较小,淡室浓度变化情况基本相同;当淡室甲酸质量分数为1.00%时,EDI膜堆可获得较高的电流并具有较低的耗电量。总结认为该研究结果可为EDI处理甲酸废水工业装置提供设计依据。     

倒极电去离子苦咸水淡化技术的试验研究

在常规电去离子(EDI)的浓缩室中采取与淡水室相同的树脂填充策略构成频繁倒极电去离子(EDIR)过程,以模拟苦咸水为处理对象,重点考察了阴阳树脂比例、树脂粒径、隔板厚度、树脂填充方式对EDI苦咸水淡化过程的影响。结果表明,在阴阳树脂体积比4:6、树脂粒径0.45～0.71 mm、采用隔板厚度3 mm以及树脂均匀混合填充时,可获得最低的产水能耗。对于3 000 mg/L的进水含盐量,EDIR的脱盐率可达90%以上,耗电量1.95 kWh/m3,过程运行稳定。EDIR有望成为具备较强竞争力的苦咸水淡化新技术。     

电去离子集成过程分级浓缩与纯化电镀镍漂洗废水

Successive concentration and purification of simulated nickel-electroplating rinsing wastewater was carried out by integrating membrane process with electrodeionization. The concentrate compartments were filled with ion exchange resins to enhance the separation. The concentrate stream of the primary EDI procedure was operated in closed circuit circulation. The influence of the volumetric ratio of resins in concentrate compartments on the separation was examined. It was found that the best performance could be achieved when anion to cation resin ratio of 6∶4 was adopted. With feed Ni²⁺ concentration of 50 mg·L^-1 and pH of 4.25,the Ni²⁺ concentration of effluent dilute stream could reach 2.78 mg·L^-1 while that of the effluent concentrate stream was as high as 11171 mg·L^-1,which gave a concentration ratio of higher than 220. The effluent dilute stream of the primary EDI was then sent to the second EDI stack for deep desalting. Dilute product with resistivity of 1.6—2.0 MΩ·cm was then obtained,which could be recovered as pure water for electroplating. The membrane process integrated with EDI could find its potent role for zero emission and resource reuse of heavy metal wastewater.     

Electrodeionization 1: Migration of Nickel ions absorbed in a rigid, Macroporous Cation-exchange Resin

The removal of nickel ions from a packed bed of ion-exchange material under an applied potential is studied. This process involves the use of an electrodialysis type cell in which the centre compartment is filled with a packed bed of ion-exchange particles. The bed width, concentration of nickel in the resin and electrolyte concentration were varied. Emphasis was placed on the rate of nickel migration, current efficiency and the effective mobility of nickel in the system. The purpose of the study is to aid in the development of a system for the continuous removal of heavy metal ions from dilute solutions.     

离子交换树脂对白扦中莽草酸的分离纯化

建立了离子交换树脂分离纯化白扦中莽草酸的工艺条件和参数。通过研究D261、D296、D301-R、D301-G、D290、201*7(717)、D201和D280共8种离子交换树脂对莽草酸的吸附和解吸附能力,筛选出最佳树脂为D290,确定了最佳的吸附与解吸附工艺参数,吸附条件为pH=6、25 ℃、流速为3 mL/min;脱附条件为：洗脱液为2.5%NaOH水溶液,洗脱流速为3 mL/min。莽草酸样品溶液经D290树脂吸附与脱附后回收率为92.53%,纯度由2.97%提高到46.76%,提高了15.74倍。实验结果表明,D290树脂对莽草酸的吸附量大,脱附容易,可以应用于莽草酸的分离纯化。     

Synthesis of a polyacrylamide chelating resin and applications in metal ion extractions

A series of differently crosslinked polyacrylamide chelating resins were prepared, using N,N′-methylene-bis-acrylamide as the crosslinking agent. The crosslinked resins were functionalized by the reaction with ethylene diamine to get amino group capacities varying from 4.2 to 1.1 mequiv/g. The maximum adsorption capacities of the lightly crosslinked resin for Fe³⁺, Fe²⁺, Ni²⁺, and Cu²⁺ are 3.62, 4.22, 1.48, and 1.67 mequiv/g, respectively. The adsorbed metal ions can be quantitatively desorbed. The adsorption rate and the influence of pH on the adsorption of metal ions were examined. The resins can be used for the separation between different metal ions as well as the ions in different valence states (e.g., Fe³⁺ and Fe²⁺). The resin is amenable for continuous process and can be regenerated several times.     

电渗析用于多元醇溶液脱盐的实验研究

考察了操作电压、浓淡室流速比、浓淡室溶液体积比3种操作条件变化对普通离子交换膜、化工分离专用离子交换膜、均相离子交换膜脱盐性能的影响。研究表明,采用电渗析法能够有效脱除多元醇溶液中有机酸盐,化工分离专用离子交换膜的综合性能优于普通离子交换膜和均相离子交换膜,当采用化工分离专用离子交换膜浓淡室流速比为3∶1时,多元醇损失率为1%,浓淡室溶液体积比为1∶4时,对化工分离专用离子交换膜性能基本没有影响。     

2,4-二羟基苯甲酸在3种树脂上的吸附特性

通过静态和动态吸附实验, 研究了717(凝胶型,强碱)、D201(大孔型,强碱)和D301R(大孔型,弱碱)3种阴离子交换树脂对水溶液中2,4-二羟基苯甲酸的吸附特性. 结果表明,717和D201在pH 4~11时、D301R在pH 3~9时吸附能力最好. 在pH=5及温度293~313 K、初始浓度0.6488~6.488 mmol/L条件下,D301R, 717和D201对2,4-二羟基苯甲酸的等温吸附规律均符合Freundlich模型,最大平衡吸附量分别为2.98, 2.66和2.54 mmol/g(吸附未达饱和),均为物理性自发吸附的放热过程. 动力学实验数据用准一级模型方程拟合比准二级更接近实验值. 5%(w) NaCl+2%(w) NaOH脱附液100 mL均可有效洗脱3种树脂上吸附的2,4-二羟基苯甲酸,脱附率达99%. 相同条件下,D301R树脂对2,4-二羟基苯甲酸的吸附性能优于D201和717树脂.     

D201树脂对水杨酸的吸附热力学与动力学

以D201大孔阴离子交换树脂对水溶液中水杨酸的吸附热力学和动力学特性进行了研究。结果表明:在pH=3~12时,吸附能力最好。等温吸附服从Freundlich经验式。在298~318K条件下,水杨酸吸附量为100~120 mg/g的吸附焓变为-7.38~-5.00 kJ/mol、自由能变为-8.46~-9.37 kJ/mol、吸附熵变为3.62~13.74 J/(K.mol)。吸附动力学符合Lagergren一级速率方程,吸附速率常数为0.0472~0.124/min,吸附活化能为38.1 kJ/mol。颗粒内扩散是速率控制步骤之一,膜扩散也共同影响着吸附过程。303 K下用5%NaCl+2%NaOH溶液可定量洗脱,洗脱率达99%。     

Investigation of transport phenomena in a hybrid ion exchange-electrodialysis system for the removal of copper ions

Hybrid ion exchange electrodialysis processes allow the removal of metal ions from dilute waste liquids and the recovery of more concentrated solutions. The work reported here was aimed at investigating the two steps in the treatment process, namely, adsorption of metal ions onto the packed bed of resin and electromigration (i.e., the transport of these ions in the complex system under the applied electrical field). The case of copper sulfate was investigated. Dowex resins with a cross-linking degree of 2 and 8% were used. The flux of copper through the resin bed and the current efficiency for ion transfer to the cathode compartment were determined as a function of potential gradient and copper ionic fraction in the bed. Apparent diffusion coefficients of Cu²⁺ in the overall system were deduced from the experimental data.