Parameter study on the adsorptive drying of isopropanol in a fixed bed adsorber
Parameter study on the adsorptive drying of isopropanol in a fixed bed adsorber
复制标题
DOI：
10.1016/j.seppur.2014.06.030
复制
发表时间：
2014-08
影响因子：
8.6
通讯作者：
Bernd Burrichter;C. Pasel;M. Luckas;D. Bathen
中科院分区：
文献类型：
--
作者：
Bernd Burrichter;C. Pasel;M. Luckas;D. Bathen
本文主要研究了在固定床吸附器中，工艺参数对极性有机溶剂吸附除水动力学的影响。作为模型溶剂，使用水浓度在5和4000 ppmw之间的异丙醇。在第一步中，通过摇瓶实验确定3A和4A沸石上的平衡负载。结果符合Langmuir方程。在第二步中，进行固定床实验以表征吸附过程的动态行为。在这些实验中，3A沸石显示出比4A沸石更好的干燥性能。穿透曲线（BTC）可以很好地描述动态模拟使用一组微分方程的质量平衡和线性驱动力的方法（LDF）的动力学。通过模拟获得的孔隙扩散率约为10 - 12 m2/s，这表明沸石孔隙中的表面扩散是传质的主要机制。
This work focuses on the influence of process parameters on the dynamics of adsorptive water removal from polar organic solvents in a fixed bed adsorber. As a model solvent isopropanol with water concentrations between 5 and 4000 ppmwwas used. In a first step equilibrium loadings on 3A and 4A zeolites were determined by shaker bottle experiments. The results were fitted to the Langmuir equation. In a second step fixed bed experiments were carried out in order to characterize the dynamic behavior of the adsorption process. In these experiments 3A zeolite shows a better drying performance than 4A zeolite. The breakthrough curves (BTC) could be well described by dynamic simulations using a set of differential equations for the mass balances and a linear driving force approach (LDF) for the kinetics. Pore diffusivities in the order of 10−12m2/s were obtained by the simulation, indicating that surface diffusion in the pores of the zeolites is the predominant mechanism of mass transfer.