Use of Single-Column Models for Efficient Computation of the Periodic State of a Simulated Moving-Bed Process

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• 作者：Joã ; o M. M. Ara&uacute ; jo ; Rui. C. R. Rodrigues ; and José ; P. B. Mota
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2006
• 出版时间：July 19, 2006
• 年：2006
• 卷：45
• 期：15
• 页码：5314 - 5325
• 全文大小：348K
• 年卷期：v.45,no.15(July 19, 2006)
• ISSN：1520-5045

文摘

A mathematical framework for developing efficient methods to calculate the cyclic steady state (CSS) of thesimulated moving-bed (SMB) process is established based on single-column models. The formulation andmethods presented are equally applicable to recently developed SMB enhancements that vary some of theoperating parameters during a switching interval. These include, among others, Varicol, PowerFeed, ModiCon,and modulation of solvent strength during process operation. The solution methods can be classified into twomajor classes: dynamic methods which integrate in time, either truly or artificially, the governing equationsover a large number of cycles until CSS is reached, and methods which rely on the direct prediction of theCSS by simultaneously discretizing the spatial and temporal coordinates. The performance of each solutionmethod is measured in terms of CPU time, number of cycles to attain CSS, and CPU time per cycle. Thevarious methods are compared for the separation of two binary mixtures that are sufficiently different, inisotherm models and selected operating parameters, for their overall analysis to provide conclusions of generalapplicability.