Diffusion in multicomponent gas adsorption on MSC5A, chromatographic study
1. Introduction The combination of chromatographic method and moment analysis of the response peaks is one of the useful techniques to study adsorption equilibrium and adsorption rate. Perturbation chromatography with the mixed multi component adsorbate gas carrier (two adsorbates) has been applied to several studies on adsorption. In this work, perturbation chromatography with multi component gas carrier (two adsorbates with inert gas) and non-equilibrium thermodynamics liner law was applied for discussion of the interference effect and the displacement effect (those are cross effects) on mass transfer in multi component gas adsorption. Moment analysis method and stop & go simulation method were utilized to obtain each mass transfer parameters of adsorbate gases. Dependency of micropore diffusion on amount adsorbed and correlation of micropore diffusion with chemical potential driving force for microporous adsorbent were discussed. Also, cross effect were discussed. Ruthven already pointed the dependency of micropore diffusivity on amount adsorbed in single component adsorption. Tondeur et al gave general background on multi component perturbation chromatography for the first moment only.
Simulation of Pressure Swing Adsorption for Air Separation
Experimental data of air separation for oxygen enrichment by pressure swing adsorption (PSA) were obtained, using synthetic zeolite as adsorbent, at various conditions of flow rate, cycle time and production portion in half cycle time. PSA simulation method (called as Stop-Go method) was applied to this air separation. This Stop-Go method is a kind of cell model accounting for the overall adsorption rate (i.e. the column is supposed to be divided in axial direction to several tens of cells) and consists of alternate calculation repetetion of adsorption or desorption amount in cells and flow amount between cells for each small time increment at each pressurization, adsorption and evacuation step. Experimental results were well simulated by this Stop-Go method, that is, the effects of operational factors, such as flow rate and cycle time, on the performance of air separation PSA were well explained as well as the absolute values of yield and product purity were estimated. Also, axial distributions of oxygen and nitrogen in the column were found to be resonably predicted.
Frequency selective surface design for blinds applications
In this paper, the reconfigurable blind structure with frequency selective surfaces(FSS) for the building applications are presented. Frequency transmission characteristics for different angles of the proposed blind-FSSs are investigated and verified through simulation and measurement. The simulation results show that we can implement the reconfigurable blind-FSS for multiband wireless applications. To verify the proposed paper, two kinds of blind-FSSs, crossed dipole FSS and circular ring FSS are fabricated and measurements are performed for different angles. The proposed structure in this paper which is very simple, can be easily applied to any planar surface for wireless security applications at low cost.