大孔树脂对副产稀硫酸中铁离子的吸附研究

研究了几种大孔型离子交换树脂对副产稀硫酸中Fe离子的吸附性能。结果表明,D001树脂对副产稀硫酸中铁离子有较好的离子交换性能。通过静态实验,考察了吸附时间、吸附温度对吸附效果的影响,结果表明：室温条件下,树脂吸附150 min即能达到较大的饱和吸附量。通过动态柱交换实验,改变液相流速,确定动态吸附操作流速为1.5 BV...     

不同型号大孔树脂对苹果多酚物质的吸附特性

通过进行静态和动态吸附实验,研究了不同型号大孔树脂对红富士苹果多酚的吸附特性。各型号大孔树脂的静态与动态吸附性能及解析率不同,但差异不显著(p0.05),且吸附及解析规律基本一致,其吸附及解析性能顺序为XDA-5AB-8D-101XDA-7;XDA-5大孔树脂静态和动态吸附性能和解析性能均最好,其静态解析率和动态解析率分别达(69.281±0.214)%和(73.585±0.499)%;XDA-5大孔树脂对苹果多酚的静态和动态吸附性能均比其他类型树脂好,且XDA-5对苹果多酚的动态吸附的吸附量和解析率均较静态吸附更高。     

离子交换树脂吸附TP5的热力学和动力学研究

针对凝胶型阳离子交换树脂对TP5的吸附行为,研究了间歇反应中TP5水溶液的吸附热力学与动力学特性。热力学研究表明,TP5在所用树脂上的吸附平衡数据符合Langmu ir吸附等温方程。在283.15~303.15 K之间,TP5的质量浓度在10 g/L时,离子交换树脂对TP5的吸附过程可分两个阶段,第一阶段受液膜扩散控制,第二阶段主要吸附过程受颗粒扩散的控制。利用TP5在不同条件下的动态吸附性能实验,考察了pH值、温度、溶液初始浓度、搅拌转速等因素的影响。采用两相阻力模型描述了TP5在离子交换介质中的动态吸附性能,通过计算得到了TP5在吸附剂颗粒中的颗粒扩散系数,有助于进一步研究小肽在吸附过程中的传质现象。     

大孔吸附树脂对沙棘叶总黄酮的吸附性能考察

以吸附值(mg/g)和解吸附率(%)为评价指标,通过静态吸附/解吸附分别考察LSA-40、LSA-21、DM-130、HPD450、D101和XDA-1六种大孔吸附树脂对沙棘叶总黄酮的吸附/解吸附性能。通过动态吸附/解吸附优选沙棘叶总黄酮最佳分离工艺条件。结果表明中极性树脂LSA-21在吸附/解吸附方面显示出最佳的综合性能,对沙棘叶总黄酮的静态吸附值/解吸附率分别为131.78mg/g和55.53%,经静态和动态吸附后得到的总黄酮纯度分别为19.4%和20.3%。     

离子交换树脂吸附分离人凝血酶原复合物研究

用静态方法研究了扩张床用离子交换树脂Streamline DEAE对人凝血酶原复合物（以下简称PCC）的吸附性能，在此基础上初步考察了扩张床条件下的穿透吸附效果。结果表明：在静态条件下，离子强度和缓冲液浓度对平衡吸附量有着较大的影响；Streamline DEAE对PCC的吸附符合Langmuir模型，在15℃和25℃条件下其饱和吸附量分别为66．67mg／g和80．00mg／g。在扩张床条件下，Streamline DEAE对PCC的动态吸附量达36．36mg／mL；用2．0mol／L NaCl、0．01mol／L磷酸缓冲液浓度、pH=7．0的洗脱液对吸附了PCC的凝胶树脂进行洗脱，静态洗脱率达80％以上，动态洗脱曲线表明有较好的洗脱效果。Streamline DEAE对PCC的吸附洗脱性能表明，该树脂可用于扩张床吸附分离PCC的工艺。     

离子交换树脂吸附法分离乙醇溶液中甘油的研究

通过实验探讨了离子交换树脂对乙醇溶液中甘油的吸附作用。实验结果表明,凝胶型树脂对甘油的静态吸附容量大于大孔型树脂,且一般随温度降低而增大;在所试验的几种树脂中,２０１×４（ＯＨ型）具有较大的动态吸附容量（３３．７ｍｇ甘油／ｍｌ湿树脂）。     

蛋白质在离子交换介质中的动态吸附性能

研究了离子交换介质CM－Sepharose FF对几种不同的蛋白质－溶菌酶，木瓜蛋白酶，牛血清蛋白的动态吸附性能，考察了PH值，溶液粘度，初始蛋白浓度及吸附剂量等因素的影响，结果表明，这些参数会对吸附动态吸附性能产生不同程度的影响，而这些蛋白质也都显示了相似的规律，采用两相阻力模型描述了蛋白质在离子交换介质的动态吸附性能，计算得到了蛋白质在吸附剂颗粒中的扩散系数，有助于进一步研究蛋白质吸附过程的传质现象。     

离子交换纤维对偏二甲肼的吸附性能

以火箭推进剂主要成分偏二甲肼为研究对象,通过配制模拟水样,采用强酸阳离子交换纤维对其中的偏二甲肼进行吸附,研究了偏二甲肼在离子交换纤维上的等温吸附线、吸附动力学和动态吸附,并将其动态吸附效果与732强酸阳离子交换树脂进行了对比. 结果表明,强酸阳离子交换纤维对偏二甲肼的吸附以液膜扩散为主,符合Boyd液膜扩散方程. 在291 K和研究的浓度范围内,离子交换纤维对偏二甲肼的吸附符合Freundlich等温吸附方程. 动态吸附结果表明,离子交换纤维对偏二甲肼的交换吸附速率大于离子交换树脂. 离子交换纤维柱的利用率高,相同条件下的处理量是树脂的3.86倍.     

H103大孔树脂吸附溶液中苯酚的研究 (Ⅱ)动力学及传质参数的确定

本文以静态法、动态法研究了国产 H103大孔吸附树脂(以下简称 H103)对苯酚溶液的吸附动力学性质,以 Bangham 方程拟合了吸附速度,测得了内扩散系数 k_sα_v,有效扩散系数D_i~′等,为 H103—苯酚吸附床设计提供了可靠的基础数据。     

离子交换树脂脱除高盐废水中Ca2+的特性研究

采用螯合型离子交换树脂处理氟化工脱氟后的高盐废水中钙离子(Ca²⁺)。考察了树脂对Ca²⁺在静态吸附和动态吸附过程中的主要影响因素和吸附性能，并对多次吸附-再生后的树脂吸附性能进行测试。研究结果表明：树脂对Ca²⁺最大静态吸附量为35.1 mg/g；当废水NaCl浓度为150.0 g/L时，树脂Ca²⁺吸附量仅降低5.2%，树脂耐盐性较好；pH对树脂吸附Ca²⁺的静态和动态吸附量影响较小；动态吸附过程中，随着流量增大，工作吸附容量逐渐减少，适宜的流速应在4～9 BV/h；饱和吸附后树脂充分再生情况下，工作吸附容量基本保持不变。     

Adsorption Performance of Proteins to CM Sepharose FF and DEAE Sepharose FF Adsorbents

Adsorption equilibrium and kinetics were studied for the binding of proteins to CM Sepharose FF and DEAE Sepharose FF. The influence of temperature, pH, viscosity, initial concentration and the volume of adsorbents on the adsorption characteristics was investigated in detail. The results showed that the isotherms of lysozyme to CM Sepharose FF were well described by a Langmuir-type correlation. The two phase resistance model describing the dynamic adsorption process of lysozyme, papain, BSA to CM Sepharose FF was presented, and the pore diffusion coefficients were determined by using this model and the dynamic adsorption data.     

Modeling of protein adsorption to DEAE sepharose FF: Comparison of data with model simulation

The equilibrium and kinetic characteristics of the adsorption of human serum albumin (HSA) and ovalbumin (OVA) to the DEAE Sepharose FF weak anion exchanger were experimentally determined. The rate for protein adsorption was simulated with two different models, the first being based on a single lumped kinetic parameter, while the second includes the individual mass transfer processes occurring prior to the adsorption intervention, i.e., diffusion across the liquid film surrounding individual particles and diffusion within the ion exchanger particle itself. The actual adsorption of OVA to DEAE Sepharose FF in fully mixed stirred vessels and in packed bed columns was consistent with both models. In the case of HSA, however, the adsorption profile in an agitated vessel was consistent only with the pore diffusion model and neither model could correctly predict the latter part of the breakthrough profile observed in packed bed experiments.     

Comparison of the adsorption characteristics of expanded bed adsorbent with conventional chromatographic adsorbent

The static and kinetic adsorption characteristics of Streamline DEAE and DEAE-Sepharose FF were studied under various operating conditions. The adsorption isotherms for the two types of adsorbents were obtained and found to fit well to a Langmuir-type expression. The adsorption kinetics of Streamline DEAE at different concentrations, temperatures, and viscosities were studied and a mathematical model including particle size distribution was developed to describe the adsorption performance of Streamline DEAE. Comparing the uptake curves of Streamline DEAE with DEAE-Sepharose FF, it could be concluded that Streamline DEAE achieves equilibrium faster to get equilibrium than DEAE-Sepharose FF, indicating that Streamline DEAE could be used in higher flow rate systems.     

Binary protein adsorption to DEAE sepharose FF

Equilibrium between ion exchangers and proteins is one of the most important factors in ion exchange chromatography. A model system was used to simulate the adsorption of human serum albumin (HSA) and ovalbumin (OVA) as a binary protein system to the DEAE Sepharose FF as an anion exchanger. Two models, one based on a competition between adsorbing molecules and the other a non competitive model have been compared to experimental results. Competitive adsorption was seen in experiments in which breakthrough curves and the profiles of adsorbed proteins in packed beds were determined. However, although the results for packed bed experiments were more closely predicted by the competitive model, some discrepancies were found, suggesting that when considering multicomponent protein adsorption to ion exchangers it may also be necessary to take account of factors such as the molecular size of adsorbing proteins and any potential inter protein interaction, which may hinder the development of a general model of multicomponent protein adsorption to ion exchangers.     

改进葡聚糖接枝技术制备高性能层析介质

利用改进的葡聚糖接枝技术,在以环氧氯丙烷为交联剂交联琼脂糖微球骨架的过程中加入葡聚糖溶液,在交联的同时接枝葡聚糖制得葡聚糖接枝型琼脂糖微球Rigose-Dex,再与盐酸2-氯三乙胺（DEAE）反应,获得葡聚糖接枝型高载量弱阴离子交换介质Rigose-Dex DEAE。以牛血清白蛋白（BSA）为模型蛋白,以商品化介质DEAE Sepharose 6FF为对照,系统研究了该葡聚糖接枝型Rigose-Dex DEAE的蛋白吸附性能,并进行了物理性能研究。结果表明,改进后葡聚糖接枝技术的最高接枝量为24.5mg/mL。自制Rigose-Dex DEAE可耐受700cm/h 的线性流速,对BSA的动态饱和载量为127.6mg/mL, 为商品介质DEAE Sepharose 6FF 载量的212%;具有在高流速下快速结合蛋白的能力,上样蛋白溶液在层析柱中停留2min即可基本达到饱和动态载量;重复使用性能好,经120 次在线清洗后,Rigose-Dex DEAE介质的动态载量为原始载量的90.4%。     

Surface DEAE groups facilitate protein transport on polymer chains in DEAE‐modified‐and‐DEAE‐dextran‐grafted resins

Sepharose FF was modified with diethylaminoethyl‐dextran (DEAE‐dextran, DexD) and/or DEAE (D) to fabricate three types of ion exchangers FF‐DexD (grafting‐ligand resin), FF‐D (surface‐ligand resin), and FF‐D‐DexD (mixed‐ligand resin), for protein adsorption equilibria and kinetics study. It was found that both adsorption capacity and uptake rate (effective diffusivity, D_e) were significantly enhanced by grafting DEAE‐dextran. Notably, the D_e values on FF‐DexD and FF‐D‐DexD (D_e/D₀ > 1.4) were six times greater than those on FF‐D (D_e/D₀ < 0.3). More importantly, the increase of surface‐ligand density greatly enhanced uptake kinetics on FF‐D‐DexD. The results indicate that the surface ligands assisted the transport of bound proteins on polymer chains in the mixed‐ligand resins. That is, surface ligands worked as “transfer stations” between two neighboring chains, resulting in enhanced transport of bound proteins on chains. The research thus disclosed the unique role of surface ligands in facilitating protein uptake kinetics onto polymer‐grafted ion‐exchangers. © 2016 American Institute of Chemical Engineers AIChE J, 62: 3812–3819, 2016     

Protein adsorption onto diethylaminoethyl dextran modified anion exchanger: Effect of ionic strength and column behavior

Our previous studies on bovine serum albumin(BSA) adsorption to diethylaminoethyl dextran(DEAE dextran,DexD, grafting-ligand) and DEAE(D, surface-ligand) modified Sepharose FF resins found that all the grafted resins(FF-DexD and FF-D-DexD) exhibited extremely fast uptake rate(effective diffusivity, D_e, D_e/D_O 1.4),which was six times greater than the ungrafted resins(D_e/D_O 0.3). In this work, the influence of ionic strength(IS) on 6 typical DEAE dextran-grafted resins was investigated. Bath adsorption equilibria and kinetics, breakthrough, and linear gradient elution experiments were conducted. Commercial DEAE Sepharose FF was used for comparison. It is found that protein adsorption capacities on DEAE dextran-FF resins and the commercial resin decreased with increasing IS, but DEAE dextran-FF resins exhibited much higher capacity sensitivity to salt concentration. Besides, steeper decrease of adsorption capacities could be obtained at higher graftingligand or surface-ligand density. It is worth noting that the facilitating role of surface-ligand to the "chain delivery" effect was weakened after adding salt, leading to the less improvement in uptake rate by increasing surface-ligand density at higher IS. Although the uptake rates of the DEAE dextran-FF resins increased first and then decreased with increasing IS, they kept the extremely high level of De values(D_e/D_O 1.1) at the their working/binding IS range. Moreover, the DEAE dextran-FF resin displayed much higher adsorption capacities and De values than commercial ungrafted resin in their working condition. Furthermore, the column results of DEAE dextran-FF resins presented higher dynamic binding capacities than and similar elution ISs with DEAE Sepharose FF to achieve similar(or even higher) recoveries suggest the excellent chromatographic column performance of the DEAE dextran-FF resins. Finally, both high recovery and purity of BSA and γ-globulin could be easily achieved using the typical DEAE dextran-FF column, FF-D60-DexD160, to separate their binary mixtures,by step gradient elution. The research has provided new insights into the practical application of the series of DEAE-dextran grafted resins in protein chromatography and proved their superiority.     

盐种类和浓度对蛋白质疏水性吸附过程有效孔扩散系数的影响

研究了牛血清白蛋白在配基密度不同的两种疏水性吸附剂Phenyl Sepharose FF low sub和Phenyl Sepharose FF high sub上的吸附平衡和孔内传质动力学,重点考察了盐种类和浓度的影响.结果表明,Na2SO4溶液中盐浓度的增加导致蛋白质吸附容量的增大和解离常数的降低比(NH4)2SO4溶液更显著.利用孔扩散模型得到的有效扩散系数随盐浓度及配基密度的增大而提高,表明表面扩散作用对孔内传质的贡献随吸附容量提高而增大.     

Streamline DEAE对蛋白酶复合物的吸附平衡研究

以人凝血酶原复合物(以下简称PCC)为目标产物,研究了扩张床用离子交换树脂Streamline DEAE对蛋白酶复合物的吸附平衡。测定了不同温度下的吸附等温线和吸附动力学曲线,并通过计算求得热力学和动力学参数。结果表明:Streamline DEAE对PCC的吸附符合Langmuir模型,吸附反应的焓热变为34.466 kJ/mol;吸附动力学曲线用拟二级速率方程拟和有着较好的吻合度。吸附过程中蛋白质分子在树脂颗粒内部的扩散为控制步骤,求得吸附反应的表观活化能为29.089 kJ/mol,表明此Streamline DEAE对PCC的吸附具有反应速率快,性能稳定等特点。