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Modeling of adsorptive removal of benzalkonium chloride from water with a polymeric adsorbent

机译：用聚合物吸附剂从水中吸附去除苯扎氯铵的模型

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摘要

Adsorptive removal of cationic surfactants from water by using a hydrophobic polymer adsorbent was investigated. Equilibrium and kinetics of benzalkonium chloride (BKC) adsorption on Amberlite XAD-16 were studied in a batch adsorber. Because commercial BKC products are mixtures of C_(12) and C_(14) homo-logues, these data were measured for each homologue. The adsorption isotherms were correlated with the competitive Langmuir model, and intraparticle mass transfer kinetics with a Fickian pore diffusion model assuming local equilibrium in the pores. Fixed-bed adsorption experiments were used to determine the dynamic loading capacity of the adsorbent. The saturation capacity was found to be large (200 BV), but the effective capacity was smaller (80 BV) due to high mass transfer resistance. It was shown that regeneration of the loaded adsorbent can be intensified by using an organic co-solvent (ethanol). With 50 wt% ethanol in the desorbent, the regeneration of the column was completed a hundred times faster than with pure water. A mathematical model was derived to describe the influence of ethanol on the adsorption of the BKC homologues. When applied in the column simulation, the proposed model yielded a very good prediction of column performance over a wide range of desorbent concentrations. Process performance aspects, such as the influence of the desired surfactant removal percentage on productivity, were discussed on the basis of simulation results.
机译：研究了使用疏水性聚合物吸附剂从水中吸附去除阳离子表面活性剂的方法。在间歇式吸附器中研究了苯扎氯铵（BKC）在Amberlite XAD-16上的吸附平衡和动力学。由于商用BKC产品是C_（12）和C_（14）同源物的混合物，因此对每种同源物都测量了这些数据。吸附等温线与竞争性Langmuir模型相关联，颗粒内部的传质动力学与Fickian孔扩散模型（假设孔中局部平衡）相关。固定床吸附实验用于确定吸附剂的动态负载能力。发现饱和容量大（200 BV），但是由于高的传质阻力，有效容量较小（80 BV）。已经表明，可以通过使用有机助溶剂（乙醇）来增强负载的吸附剂的再生。在解吸剂中使用50 wt％的乙醇时，色谱柱的再生完成速度比纯水快一百倍。推导了一个数学模型来描述乙醇对BKC同源物吸附的影响。当应用于色谱柱模拟时，所提出的模型可以在很宽的脱附剂浓度范围内很好地预测色谱柱的性能。在模拟结果的基础上，讨论了过程性能方面，例如所需表面活性剂去除率对生产率的影响。

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