Extended Rate Constant Distribution Model for Sorption in Heterogeneous Systems: 3. From Batch to Fixed-Bed Application and Predictive Modeling,Industrial & Engineering Chemistry Research

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Extended Rate Constant Distribution Model for Sorption in Heterogeneous Systems: 3. From Batch to Fixed-Bed Application and Predictive Modeling
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-10-16 , DOI: 10.1021/acs.iecr.0c03516
Alexey Golikov ₁ , Irina Malakhova ₁ , Yuliya Privar ₁ , Yuliya Parotkina ₁ , Svetlana Bratskaya ₁

Affiliation

Here, we have demonstrated that the recently developed extended rate constant distribution (RCD) model for sorption on heterogeneous sorbents can be applied to predict the column behavior of the sorbents using parameters determined from the sorption kinetics in batch. The suggested approach has been validated on the batch and fixed-bed experimental data of Cu(II), Cd(II), and Zn(II) ion sorption on a polyethyleneimine (PEI) cryogel. Although the average sorption rate constants decreased in the order Cu(II) > Zn(II) > Cd(II), “fast” and “slow” sorption centers with different affinities have been identified for all investigated ions. This explained why, depending on the experimental conditions (flow rate and metal ion concentrations), one or another ion from the mixture can adsorb preferentially on PEI in fixed-bed applications, while at long equilibration time, the ratio between adsorbed metal ions was determined by the sorbent affinity. We have also shown that sorption rate constants for the PEI cryogel determined from the batch data were ∼0.6 log units lower than those determined from fixed-bed experiments that proved higher sorption efficiency for this type of sorbent under dynamic conditions. The column efficiency coefficient introduced to the RCD model for the fixed-bed application allowed us to reveal intrinsic and operational defects in soft monolith sorbents materials, which originated from imperfection of fabrication or destruction of the porous structure at high flow rates, respectively.

中文翻译：

异构系统中吸附的扩展速率常数分布模型：3.从批处理到固定床应用和预测建模

在这里，我们已经证明，最近开发的用于异质吸附剂吸附的扩展速率常数分布（RCD）模型可以用于根据批次吸附动力学确定的参数来预测吸附剂的色谱柱行为。所建议的方法已在聚乙烯亚胺（PEI）冷冻凝胶上吸附Cu（II），Cd（II）和Zn（II）离子的分批和固定床实验数据上得到验证。尽管平均吸附速率常数按Cu（II）> Zn（II）> Cd（II）的顺序降低，但已为所有研究的离子确定了具有不同亲和力的“快速”和“慢速”吸附中心。这解释了为什么根据实验条件（流速和金属离子浓度），混合物中的一种或另一种离子在固定床应用中可以优先吸附在PEI上，而在很长的平衡时间内，吸附金属离子之间的比例由吸附剂的亲和力决定。我们还表明，由批处理数据确定的PEI冷冻凝胶的吸附速率常数比固定床实验确定的低约0.6 log个单位，而固定床实验表明在动态条件下此类吸附剂具有更高的吸附效率。引入固定床RCD模型的柱效系数使我们能够揭示软整体吸附剂材料的内在和操作缺陷，这些缺陷分别是由于高流速下多孔结构的制造不完善或破坏造成的。我们还显示，从批处理数据确定的PEI冷冻凝胶的吸附速率常数比固定床实验确定的低约0.6 log个单位，而固定床实验在动态条件下证明了这类吸附剂的吸附效率更高。引入固定床RCD模型的柱效系数使我们能够揭示软整体吸附剂材料的内在和操作缺陷，这些缺陷分别是由于高流速下多孔结构的制造不完善或破坏造成的。我们还显示，从批处理数据确定的PEI冷冻凝胶的吸附速率常数比固定床实验确定的低约0.6 log个单位，而固定床实验在动态条件下证明了这类吸附剂的吸附效率更高。引入固定床RCD模型的柱效系数使我们能够揭示软整体吸附剂材料的内在和操作缺陷，这些缺陷分别是由于高流速下多孔结构的制造不完善或破坏造成的。

更新日期：2020-10-29

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