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.
Concentration of Dilute Gases by Pres sure-Swing Adsorption
4工程から成る圧力スイングサイクルによる希薄成分の吸着濃縮について理論的および実験的研究を行ない, 次の結論を得た。1) 直線平衡系については, 吸着, 減圧およびパージの各工程における流出濃度および塔内の濃度前線の移動が理論的に求められる。2) 減圧工程において平衡脱着の仮定の下で導いた理論解は実験値とよく一致する。なお具体例として核燃料再処理排ガス中の放射性クリプトンの濃縮除去に理論および実験結果を適用し, 圧力スイングサイクル吸着装置の設計に必要な諸元の計算方法を提出し, 計算例を示した。