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Experimental and theoretical study on the adsorptive drying of primary alcohols in a fixed bed adsorber

机译：固定床吸附器中伯醇的吸附干燥实验与理论研究

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In this paper systematic investigations on the adsorptive drying of primary alcohols from methanol to 1-hexanol on 3A and 4A zeolites are presented. The focus of the work is laid on the superdrying of these polar solvents in the ppm(w)-region. In addition to equilibrium data gained in shaker bottle experiments information regarding the dynamic drying behavior was obtained by breakthrough experiments. The water content in these experiments was monitored online by a transmission photometer. Based on the experimental data a physical model was developed in order to predict the dynamic drying behavior in a fixed bed adsorber. Most of the investigated systems could be well described by this model. Furthermore pore diffusivities of water could be obtained by fitting the model to the experimental data. The results of this study reveal a clear dependency of the dynamic drying behavior of primary alcohols from the solvent to be dried and the type of zeolite. Small alcohol molecules show significantly faster drying rates than long-chain alcohols and the drying kinetics on a 3A zeolite is much faster than on a 4A zeolite. The experimental results were correlated to the molecular dimensions of adsorptives and the size of the pore openings of the zeolites as well as to the interactions between adsorptive, solvent and adsorbent. (C) 2015 Elsevier B.V. All rights reserved.
机译：本文对3A和4A沸石上伯醇从甲醇到1-己醇的吸附干燥进行了系统的研究。工作的重点放在这些极性溶剂在ppm（w）区域的超干。除了在摇瓶实验中获得的平衡数据外，还通过突破性实验获得了有关动态干燥行为的信息。这些实验中的水含量通过透射光度计在线监测。基于实验数据，开发了物理模型，以预测固定床吸附器中的动态干燥行为。该模型可以很好地描述大多数研究的系统。此外，可以通过将模型拟合到实验数据来获得水的孔隙扩散率。这项研究的结果表明，伯醇从待干燥的溶剂中动态干燥的行为与沸石的类型之间存在明显的相关性。较小的醇分子显示出比长链醇快得多的干燥速率，并且在3A沸石上的干燥动力学比在4A沸石上的干燥动力学快得多。实验结果与吸附剂的分子尺寸和沸石孔的大小以及吸附剂，溶剂和吸附剂之间的相互作用有关。 （C）2015 Elsevier B.V.保留所有权利。

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