D113弱酸性离子交换树脂吸附L-组氨酸

测定了25℃下D113弱酸性离子交换树脂吸附L-组氨酸的动力学曲线和吸附等温线,考察了溶液中pH值、硫酸铵浓度、L-赖氨酸浓度和L-精氨酸浓度等因素对吸附的影响。结果表明:D113离子交换树脂吸附L-组氨酸约30 m in即可达到平衡;Langmu ir方程可以较好地描述D113离子交换树脂对L-组氨酸的吸附;在实验pH值范围内,L-组氨酸的吸附率随pH值的减小而减小,当pH降至3.4时,吸附量仍达到133mg/g;NH4+离子的存在使L-组氨酸的吸附量明显下降,当氯化铵浓度达到1.0mol/L时,吸附量仅为6.8mg/g;L-赖氨酸或L-精氨酸的存在使吸附量略微减小。     

改进软化水生产工艺实现降本增效

齐鲁石化公司炼油厂软化水站原生产工艺存在消耗高、周期制水量少的问题。为解决这一问题,进行了简单的工艺改造。将氢离子交换器内树脂由001×7型改为D113型,利用D113树脂工交大、易再生的优点,达到节水降耗的目的,取得了显著的经济效益。     

新型弱酸性丙烯酸系阳离子交换树脂

近几年来我国先后从国外引进的一些大型化肥装置中所用的离子交换树脂是西德拜耳公司的Lewatit CNP-80和美国罗门哈斯公司的Amberlite IRC-84。为了解决上述装置中离子交换树脂在失效后的填补问题,我们用新型交联剂衣康酸烯丙酯合成了凝胶型弱酸性阳离子交换树脂(简称113)和大孔型弱酸性阳离子交换树脂(简称D113)。四川、江苏、安徽的有关工厂使用的结果表明,在水的净化方面,113和D113两种树     

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。     

树脂法处理己二胺废水工业实践

己二胺生产废水含有己二胺和环己亚胺,为避免污染环境和回收有用组分,实验采用D113树脂处理该废水。现场实验表明,该树脂对己二胺和环己亚胺的吸附率分别为99%和95%。经过该工艺处理后,废水中己二胺和环己亚胺的浓度分别在30 mg.L-1和25 mg.L-1以下,均达到国标GB8978-1996污水综合排放二级标准。并考察了树脂的再生及重复使用情况,结果表明:D113吸附树脂性能稳定,机械强度高,经过吸附后的树脂用盐酸再生,其解吸率高,再生效果好,解吸率大于85%。     

具有微孔结构的大颗粒球状聚偏氯乙烯树脂的研制及应用

考察了交联剂种类与用量对悬浮法聚偏氯乙烯(PVDC)树脂比表面积、磨后圆球率和孔径的影响。结果表明:①加入交联剂可提高PVDC树脂的比表面积、磨后圆球率和孔径,其中双甲基丙烯酸乙二醇酯的改性效果最好,其最佳用量为单体质量的10%;②按照最佳配方制得PVDC树脂,进一步制得的碳分子筛具有很高的吸附率、较宽的吸附范围。     

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     

不同类型抗湿滑树脂在白炭黑胎面胶中的协同应用研究

研究不同类型抗湿滑树脂在白炭黑胎面胶中的协同应用效果。结果表明:与空白配方胶料相比,加入不同组合抗湿滑树脂胶料的门尼粘度和交联密度降低,邵尔A型硬度、300%定伸应力和回弹值减小,拉伸强度和拉断伸长率增大,耐磨性能下降,白炭黑分散性和抗湿滑性能提高,滚动阻力增大;两种不同类型抗湿滑树脂的协同使用可以很好地平衡胎面胶的动态力学性能。     

树脂基纳米FeOOH复合材料去除Cr(Ⅵ)性能研究

通过浸渍法制备大孔强碱型树脂基纳米羟基铁复合材料(nFeOOH-D201)以提高树脂去除Cr(VI)的能力和再生性能。实验结果显示，由于羟基铁颗粒(20～100 nm)被均匀负载到D201表面，因此nFeOOH-D201不仅保留了D201的静电吸附能力，还获得羟基铁的络合能力，相比于D201其对Cr(VI)的去除率提高了24.1%，并表现出更强的抗其他阴离子如NO₃^-和SO₄^2-竞争吸附的能力；可采用醋酸对吸附后的nFeOOH-D201进行脱附，经过5次循环使用后，其对Cr(VI)的去除率依然可达33.9%，是D201的3.7倍；可使用1 mol/L盐酸溶解nFeOOH-D201表面的nFeOOH并重新负载，再生率达90%以上。研究结果表明，羟基铁改性可显著提高D201的Cr(VI)去除能力和再生性能。     

丁苯吡乳液聚合的聚合规律研究

研究分析丁苯吡乳液聚合过程参数(转化率孙聚合反应速率RP和聚合釜压力P)和乳液参数(胶乳pH值、粘度μ、表面张力σ、吸附率φ和粒径D等)随聚合时间t的变化规律。结果表明，η-t关系曲线与经典乳液聚合动力学曲线相似；RP先迅速增大，再保持不变，然后逐渐减小；P先保持不变，后逐渐减小；胶乳pH值缓慢减小；μ先迅速增大，达到峰值后又迅速减小；σ先减小，达到最小值后又逐渐增大；φ和D先增大，达到最大值后又逐渐减小。     

注塑级聚丙烯专用料ZK-1240D的开发与生产

介绍注塑级PP专用料ZK－1240D的开发与生产。采用合适的基础树脂，在挤压造粒阶段加入复合（成核）改性剂，调节工业化生产装置的有关工艺参数，生产的树脂具有高流动性、高耐冲击性，可与进口料AY－564相比；并可替代用于蓄电池外壳等。     

阳离子交换树脂催化酸性油脂酯化脱酸

采用阳离子交换树脂为催化剂研究了酸性油脂的酯化脱酸工艺。分别筛选了001×4,001×7,D113,HD-8,CD-552等几种型号的树脂,其中以CD-552催化效果最好。研究了反应时间、醇酸摩尔比和酸性油脂中催化剂质量分数对CD-552催化酯化脱酸效果的影响。在醇酸摩尔比30∶1,反应温度60℃,树脂质量分数5%和反应时间5 h的工艺条件下,酸性油脂经CD-552催化酯化脱酸后,酸值从10.97 mg/g降低到0.689 mg/g。反应后树脂易分离,能够循环使用,有效地解决了传统的脱酸催化剂不足,对以酸性油脂为原料的生物柴油的生产具有应用前景。     

焦炭粉冷固成型用粘结剂——改性水玻璃的研制

探讨了聚丙烯酰胺 ,葡萄糖 ,高岭土 ,Al Cl3,腐植酸钠 ,水溶性苯酚 -甲醛树脂和自制的水溶性树脂 A(简称为树脂 A)等对水玻璃改性的影响。结果表明 ,树脂 A使焦炭粉冷固成型的球团的生球和干球强度明显提高 ,并确定了其较佳配方 :水与水玻璃的质量比为 4∶ 6,其总用量为 16% (占干焦炭粉的质量分数 ) ;树脂 A用量为0 .2 4% (占干焦炭粉的质量分数 )。在此较佳条件下 ,所制球团的生球和干球强度 ,与用未改性水玻璃 (其中水与水玻璃的质量比为 3∶ 7) ,其总用量为 16% (占干焦炭粉的质量分数 ) )所制球团的生球和干球强度 ,几乎相等 ,但前者球团的耐水性以及耐热性有明显提高。     

D113弱酸性树脂对铟(Ⅲ)的吸附性能

研究了D113弱酸性树脂在NaAc-HAc缓冲体系中对铟(III)的吸附性能及机理。对影响树脂吸附容量的不同因素,如溶液的pH、吸附时间和温度进行了研究。结果表明:D113弱酸性树脂对铟(III)的吸附在pH=5.00的NaAc-HAc缓冲体系中最佳,每克树脂在298 K下的静态饱和吸附容量为185 mg;在不同温度下,树脂吸附铟(III)的表观吸附速率常数分别为k288K=2.72×10.5 s.1,k298K=3.69×10.5 s.1,k308K=4.48×10.5 s.1,表观吸附活化能Ea=18.4 kJ.mol.1;测得热力学参数分别为.H=3.27 kJ.mol.1,.S=68.3 J.(mol.K).1,.G298K=.17.1 kJ.mol.1。与Freundlich等温曲线相比,吸附更加符合Langmuir等温曲线。用0.5 mol.L.1 HCl进行解吸时,解吸率为100%。此外,用红外光谱方法探讨了吸附机理,结果显示:D113树脂功能基COOH中的H与In(III)发生了离子交换;同时,C=O中的O与In(III)形成了配位键。     

The importance of timely polymer sintering while processing polypropylene foams in rotational molding

Producing polypropylene (PP) foams with satisfactory cell morphologies in rotational foam molding is feasible. However, the narrow interval between the melting temperature of PP and the onset decomposition temperature of the applicable chemical blowing agent (CBA), and the relatively low melt strength of PP at elevated temperatures are considered the greatest obstacles in processing PP foams. The experimental results revealed that the morphology of the foams obtained by processing PP pellets that have been pre‐compounded with a CBA could be governed by either pellet sintering or cell coalescence. The viscosity of the basic PP resin and the processing temperature determine which of these two key factors will assume a predominating influence towards the foaming process. The desired volume expansion ratio (VER) of the foam also plays an important role since it determines the formulation of the foamable resin and the shot size. Desirable PP foam structures in compounding based rotational foam molding can be obtained only if pellet sintering takes place prior to the decomposition of the CBA and if the processing temperature during the foaming process is kept lower than the temperature of cell coalescence.     

Polymer–cement composite based on recycled expanded polystyrene foam waste

A new polymer–cement composite based on a recycled expanded polystyrene (EPS) resin has been developed as an effective method for EPS foam wastes management. The liquefied polymer is prepared by dissolving the foam waste in acetone, then in toluene at the ratio 113:2:1 per volume, respectively. The composite is made by incorporating the resulting resin into cement‐paste at selected water:cement ratios. At the end of defined curing periods, the physical, mechanical, and thermal characterizations of the obtained composite were evaluated under variable factors e.g., Acetone: toluene ratio, water:cement ratio (w/c), curing periods. Compressive strength, apparent porosity, bulk density, and specific gravity were determined for the composite under the various stated conditions. FT‐IR, XRD, thermal analysis, and scanning electron microscope (SEM) were performed for the hard blocks to study the effect of the added recycled EPS resin on the microstructure of the end products. Based on the data so far obtained it can be concluded that the candidate dissolution process of EPS foam wastes is an easily environmental friendly technique that allows afterward using the resultant resin for producing an added value, low cost, promising market competitive, and multipurpose light weight cement composite. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers     

Model-based prediction of substrate conversion and protein synthesis and excretion in recombinant Aspergillus niger biopellets

Aspergillus niger grown as biopellets in a submerged culture has been used as an expression system for glucose oxidase (GOD). With regard to mass transfer, substrate utilization and the formation and excretion of the product GOD, the behavior of aggregated cells such as biopellets differed significantly from that of systems with suspended cells. A one-dimensional pellet model has been developed which is capable to describe the relevant processes in the pellet. Experimental results showed a phase with a highly dynamic pellet size distribution during the first 20 h of the cultivation. A stable number of pellets were usually found after this first period. In the model presented this initial process was described by assuming both suspended hyphae and a fixed number of pellets. The suspended hyphae were attached to the pellets and the substrate conversion and product formation was than described with the pellet model. The model predicted the production of GOD by A. niger in a bioreactor very well. The pellet density was identified as a key parameter which has to be provided as input parameter for the simulation runs. A sensitivity analysis with three different classes of pellet sizes showed that the influence of the final pellet size distribution on the simulation result was neglectable. On the other hand, it can be shown that the total pellet number, and thus the average pellet size was an important parameter. The pellet number influenced mainly the pellet surface area and, consequently, the turnover of substrate and formation and excretion of the product.     

Purification of Soybean Phosphatidylcholine Using D113-III Ion Exchange Macroporous Resin Packed Column Chromatography

Ten ion-exchange resins were compared for their abilities to separate soybean phosphatidylcholine (PC). D113-III resin was selected for PC purification among ten resins tested. The optimum PC adsorption conditions were: concentration of PC solution, 3 mg/mL; pH of PC solution, 7.5; and adsorption flow rate, 1 mL/min. The optimum PC desorption conditions were: eluent, 95% ethanol aqueous solution; and elution flow rate, 1 mL/min. Under these conditions, the PC content in the product and the amount of product were 94 and 80% (wt.%), respectively, and the D113-III resin was able to be used at least six times for purifying PC. The adsorption and desorption characteristics were also studied.     

Evaluation of Amberlite IRC‐718 Chelating Ion Exchange Resin in Loading‐Elution‐Regeneration Cycles for the Separation and Recovery of Strontium from Alkaline Radioactive Waste

The separation and recovery of radiostrontium from simulated alkaline reprocessing waste solution has been studied using Amberlite IRC‐718, a chelating resin containing iminodiacetic acid groups. The breakthrough behavior of strontium has been determined by conducting an extended column run. The column loading performance has been correlated with batch equilibration results. Efficient elution of loaded strontium has been achieved using dilute nitric acid. Satisfactory column performance has been demonstrated in repeated loading‐elution‐regeneration cycles. Finally, the characteristics of used resin have been determined to ascertain its efficacy for further use.