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梁博 《合成材料老化与应用》2015,(3):117-119
离子交换树脂在水处理领域已经得到了广泛应用,文章介绍了离子交换柱在废水处理中的一些应用实例,离子交换柱在处理废水中存在的问题及解决方法。特别是在含汞废水、含铜废水、有机废水等的处理中的应用。 相似文献
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本文针对离子交换柱处理水时出现的实际问题,分析了影响离子交换柱使用周期的各种因素,并对原有水处理工艺进行了大量改进。改革工艺用于实践效果显著。 相似文献
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采用原位聚合法制备了聚甲基丙烯酸缩水甘油酯型连续棒状整体柱,然后用二乙胺将其修饰为弱阴离子交换色谱柱,用色谱柱对纤维素降解酶进行了分离,并提出分段洗脱纯化纤维素酶的方法。实验结果表明,该色谱柱可以实现对纤维素酶的快速分离,纯化方法切实可行。 相似文献
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Simple model equations which consider different rate control mechanisms are formulated for fixed bed multicomponent ion exchange processes. Efficient and accurate numerical methods are developed for solving these equations for liquid phase, solid phase or combined phase control. The algorithms are applicable to both ion exchange and liquid adsorption and are shown to be extendable to a general form of isotherms. The accuracy of the numerical algorithm is evidenced by the fact that the asymptotic limiting equilibrium solutions are closely approached as the dimensionless length parameter is increased, regardless of the rate control mechanism. Numerical examples for ion exchange applications are presented. These examples included multicomponent elution and purification problems. The effect of mass transfer resistance was also examined. Other examples examine the validity of a model reduction assumption and the comparison of equilibrium theory with the results obtained using the present finite mass transfer rate model. 相似文献
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针对沸石法海水富钾工程化放大中的关键问题,采用Fluent中多孔介质模型对填充沸石的大型离子交换柱内流场进行了模拟研究。主要考察了沸石的孔隙率和颗粒直径、海水进口速度、沸石柱长径比以及柱内形成的沸石层凹坑等条件对离子交换柱内流体流动的影响,结果发现:孔隙率和颗粒直径直接关系到沸石层内流体的速度分布,海水进口速度、沸石柱长径比等条件对沸石层内的流体流动并无显著影响;而在孔隙率和颗粒直径确定的条件下,由于海水冲击形成的凹坑对沸石层内流体影响较大,会在凹坑两侧形成滞留区,进而影响沸石对海水中钾的吸附。根据模拟结果优化了填充材料、设备结构以及工艺等参数,为沸石法海水富钾关键装备进一步扩大规模提供了理论支撑。 相似文献
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Electrochemical reduction of nitrate ions in synthetic regenerating solutions after ion exchange column regeneration was studied. The influence of current density on the current efficiency was determined in the range 2.8–7.6 mA cm–2 in a diaphragmless flow-through electrolyser in a batch recirculation mode. A Cu cathode and a Ti/Pt anode was used, the temperature being maintained at 25 C. Highest integral current efficiency occurred at 2.8 mA cm–2. The presence of about 6 mg dm–3 Cu ions in treated solution was found to prevent a decrease in cathode activity and, consequently, in electrolysis efficiency. The catalytic influence of Cu ions was verified by potentiodynamic polarisation experiments on a copper rotating disc electrode and by chronopotentiometry performed during the course of electrolysis. 相似文献
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José L. Valverde 《Chemical engineering science》2005,60(21):5836-5844
A generalized theoretical model for the measurement of effective diffusion coefficients of heterovalent ions in macroporous ion-exchange resins by the zero-length column method was developed. The model includes the resistance to mass transfer both in the particle and in the film and described ion fluxes with Nernst-Planck equations. Equilibrium was described using the Langmuir type empirical equation. The values of intraparticle diffusivity of Cu2+, Cd2+, Zn2+, and H+ on commercial Lewatit TP-207 were obtained by non-linear regression, these values agree fairly well with data reported previously in literature. The following trend was observed: DCu>DZn>DCd. 相似文献
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Nevill J. Bridger Christopher P. Jones Mark D. Neville 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1991,50(4):469-481
This paper introduces electrochemical ion exchange (EIX) as a technique for the removal of ionic species from aqueous waste streams. The basic mechanistic principles behind EIX are presented and experimental procedures described. Typical experimental results for a number of applications are given. A comparison is made between EIX and electrodialysis and electrodialysis combined with conventional exchange. 相似文献
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为了掌握所选的Thomas模型,Yoon-Nelson模型和Adams-Bohart模型在固定床米格列醇离子交换过程中的应用情况,实验借助对不同质量浓度的米格列醇溶液在定量树脂和固定流速下研究其在固定床中离子交换过程,并通过对透过曲线实验数据分析来验证相关固定床动力学模型在此过程中的有效性。结果表明:固定床上样液质量浓度增大,达到平衡饱和点的时间将缩短,传质区长度增大,吸附率变小,上样液质量浓度在8 mg/mL时吸附量达到最大;用动力学模型拟合透过曲线的过程参数,结果表明Thomas模型和Yoon-Nelson模型具有较好的相关系数,Thomas模型的速率常数和最大吸附量值随着上样液质量浓度的降低而增大,Yoon-Nelson模型的速率常数随着上样液质量浓度的降低而减小,且在Yoon-Nelson模型中计算得到的透过曲线中出口质量浓度与上样质量浓度比值为1/2时所对应的计算值和实验值相差很小,Thomas模型和Yoon-Nelson模型可用于该过程的离子交换性研究。 相似文献
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离子交换树脂的绿色再生工艺 总被引:2,自引:0,他引:2
在直流电场作用下,利用水代替酸碱作为再生剂再生失效离子交换树脂的体外电再生工艺,使离子交换水处理变为一种绿色环保水处理技术。从混床树脂和复床树脂再生两个方面,分别简述树脂电再生的原理及7次试验研究结果。另外,从资源消耗、对环境的影响、经济效益和管理操作等方面,进行了树脂电再生法与化学再生法的对比评价,离子交换树脂绿色再生工艺将成为绿色化学中新的领域。 相似文献
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