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Adsorptive gas dehydration with supported ionic liquids

负载型离子液体吸附气体脱水

基本信息

批准号：
213570037
负责人：
Professor Dr.-Ing. Andreas Jess
金额：
--
依托单位：
Lehrstuhl für Chemische Verfahrenstechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/213570037?language=en
关键词：
Adsorptive gas dehydration supported ionic

项目摘要

In the course of the DFG-project, which was completed in November 2015, ionic liquids (ILs) have been successfully studied with regard to their use for drying of gases by absorption (gas scrubbing). As a result, it has been found that the IL [EMIM][MeSO3] is a suitable alternative to triethyleneglycol (TEG) currently used for industrial gas drying and surpasses the TEG in important performance features: The required height of the adsorption column is lower compared to TEG; losses due to evaporation in the regeneration step are avoided because of its very low vapor pressure and the much lower regeneration temperatures needed; furthermore its stability against oxidation enables regeneration of the IL with air as stripping agent; in contrast, TEG is sensitive to oxygen. Based on these results first measurements with supported ionic liquid ([EMIM][MeSO3] on silica) have shown that such a system can be also used for gas drying. A main advantage is the much lower regeneration temperature compared to commonly used adsorption agents such as silica gel or zeolites. Within the applied new research project (application for continuation of funding), this research on supported ILs for gas drying should be continued in order to get a better and deeper insight into the new adsorption system. (Remark: Strictly speaking, steam is absorbed in the ionic liquid, which is supported on porous solid; nevertheless, the term adsorption is used here, because parallel to the absorption in the IL a real adsorption may also take place on the solid support and the process is conducted in a fixed bed typically for adsorption.) In addition to the already (partly) characterized IL [EMIM][MeSO3], two other promising ionic liquids, [EMIM][acetate] and [EMIM][Cl], are of interest for detailed investigation. At first, the focus lies on the determination of the important physicochemical data for gas drying (activity coefficient of H2O, vapor pressure) of the remaining two ILs; in addition, systematic measurements with regard to the thermodynamics of H2O-adsorption (adsorption isotherms) have to be conducted. Based on these measurements, the decision will be made which combination of IL and porous support is the best for further studies in a fixed-bed adsorber. Thereby, the pore filling degree as well as the particle size has to be varied in order to determine the influence of mass transfer (pore diffusion) on the kinetics of adsorption. This will be experimentally explored by the analysis of breakthrough curves and the height of the transfer zone, respectively. Along with these experiments, modelling of the adsorption process in the fixed-bed is crucial, on both the level of a single particle as well as the entire fixed-bed. Therefore, the differential equations considering the processes in a single particle (diffusion, adsorption) and in a fixed-bed have to be solved; by comparison of the data gained in the simulations with the experimental data, the adsorber model can be proven.

在 2015 年 11 月完成的 DFG 项目过程中，离子液体 (IL) 已成功研究用于通过吸收（气体洗涤）干燥气体。结果发现，IL [EMIM][MeSO3] 是目前用于工业气体干燥的三甘醇 (TEG) 的合适替代品，并且在重要性能特征上超越了 TEG：与 TEG 相比，吸附塔所需的高度较低；由于其蒸气压非常低且所需的再生温度低得多，因此避免了再生步骤中因蒸发而造成的损失；此外，其抗氧化稳定性使得离子液体能够以空气作为汽提剂再生；相反，TEG 对氧敏感。基于这些结果，使用负载型离子液体（二氧化硅上的[EMIM][MeSO3]）进行的首次测量表明，此类系统也可用于气体干燥。与常用的吸附剂（例如硅胶或沸石）相比，主要优点是再生温度低得多。在所申请的新研究项目（申请继续资助）中，应继续进行气体干燥用支持离子液体的研究，以便更好、更深入地了解新的吸附系统。（备注：严格来说，蒸汽被吸收在支撑在多孔固体上的离子液体中；然而，这里使用术语吸附，因为与离子液体中的吸收平行，真正的吸附也可能发生在固体支撑物上，并且该过程通常在固定床中进行，用于吸附。）除了已经（部分）表征的离子液体 [EMIM][MeSO3] 之外，另外两种有前途的离子液体液体，[EMIM][乙酸盐]和[EMIM][Cl]，值得详细研究。首先重点确定其余两种离子液体的气体干燥重要理化数据（H2O活度系数、蒸气压）；此外，还必须对 H2O 吸附热力学（吸附等温线）进行系统测量。根据这些测量结果，将决定哪种离子液体和多孔载体的组合最适合固定床吸附器的进一步研究。因此，必须改变孔填充度和颗粒尺寸，以确定传质（孔扩散）对吸附动力学的影响。这将通过分别分析突破曲线和转移区的高度进行实验探索。除了这些实验之外，固定床中吸附过程的建模也至关重要，无论是在单个颗粒还是整个固定床的水平上。因此，必须求解考虑单个颗粒（扩散、吸附）和固定床中过程的微分方程；通过将模拟中获得的数据与实验数据进行比较，可以证明吸附器模型。