当前位置: X-MOL 学术Chem. Eng. Res. Des. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Importance of spectroscopic and static gravimetric studies for exploring adsorption behavior of propan-2-ol vapor in a fixed-bed column
Chemical Engineering Research and Design ( IF 3.9 ) Pub Date : 2021-12-30 , DOI: 10.1016/j.cherd.2021.12.043
Dorota Downarowicz 1 , Krzysztof Kowalski 1 , Tomasz Aleksandrzak 1
Affiliation  

The exploration of the vapor–solid adsorption mechanism based on goodness-of-fit kinetic models raises many doubts because most of them do not consider the influence of adsorbent heterogeneity on the adsorption kinetics. Thus, results should be verified by independent studies. In this work, the mechanism of propan-2-ol (IPA) vapor adsorption on BPL 4 × 6 activated carbon was investigated using static gravimetric and column studies. Several kinetic and simplified dynamic models were used to fit experimental data. It was shown that the pseudo-second-order model provided the best agreement with the kinetic data at 0.5 g m−3, while the double-exponential model was better at higher concentrations which indicated a complex adsorption mechanism. The Yoon–Nelson and Thomas models well predicted breakthrough curves, and the overall mass transfer coefficients were approximately an order of magnitude lower than the adsorption rates determined from the kinetic models. FTIR analysis showed that the increase in IPA loading caused a change in carbon surface chemistry. This phenomenon was most pronounced at low surface coverage, suggesting that specific interactions between adsorbate and surface oxygen groups affected the process mechanism, the adsorbent capacity, and regenerability. This is in line with the results of thermodynamic studies.



中文翻译:

光谱学和静态重量学研究对探索固定床柱中丙烷-2-醇蒸气吸附行为的重要性

基于拟合优度动力学模型对气固吸附机理的探索引起了许多质疑,因为它们中的大多数都没有考虑吸附剂异质性对吸附动力学的影响。因此,结果应通过独立研究进行验证。在这项工作中,使用静态重量和柱研究研究了 BPL 4 × 6 活性炭上丙-2-醇 (IPA) 蒸气吸附的机理。几种动力学和简化的动力学模型用于拟合实验数据。结果表明,准二级模型在 0.5 g m -3处提供了与动力学数据的最佳一致性,而双指数模型在较高浓度下更好,这表明吸附机制复杂。Yoon-Nelson 和 Thomas 模型很好地预测了突破曲线,总传质系数比动力学模型确定的吸附率低大约一个数量级。FTIR 分析表明,IPA 负载量的增加导致碳表面化学性质发生变化。这种现象在低表面覆盖率下最为明显,表明吸附质和表面氧基团之间的特定相互作用影响了工艺机制、吸附剂容量和再生性。这与热力学研究的结果一致。

更新日期:2022-01-07
down
wechat
bug