SHORT CYCLE TIME APPROXIMATION OF PRESSURE SWING ADSORPTION WITH NONLINEAR ADSORPTION ISOTHERM

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

TSUTOMU HIROSE¹ 

[1] Department of Applied Chemistry, Kumamoto University

关键词: Adsorption;    Pressure Swing Adsorption;    Perturbation Method;    Nonlinear Adsorption Isotherm;    fcras Purification;   

DOI  :  10.1252/jcej.20.339

来源: Maruzen Company Ltd

【 摘 要 】

References(13)Cited-By(6)A set of nonlinear partial differential equations of material balance on pressure swing adsorption (PSA) is expanded around a small value of cycle time to study the effects of nonlinearity of adsorption isotherm on PSA performance. Solution of the zeroth-order term is given by a quadrature to predict the time-averaged concentration C, and the solution of the first-order term is given by an ordinary linear differential equation to predict the concentration swing ΔC. In the case of surface diffusion control, a moderately favorable adsorption isotherm is advantageous in that the column length required to attain the desired level of product gas concentration is minimized. The relative concentration swing ΔC/C is almost independent of the type of adsorption isotherm. The present analysis may be a good approximation if cycle time is less than the reciprocal of the volumetric mass transfer coefficient based on driving force of the amount adsorbed per unit bed volume.

【 授权许可】

Unknown