Yoshiaki Kawajiri

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In this paper, efficient optimization techniques are used to solve multi-objective optimization problems arising from Simulated Moving Bed (SMB) processes. SMBs are widely used in many industrial separations of chemical products and they are very challenging from the optimization point of view. With the help of interactive multi-objective optimization,(More)
6 Simulated Moving Bed (SMB) processes are widely used in sugar, petrochemical, 7 and pharmaceutical industries. However, systematic optimization of SMB, especially 8 finding the optimal zone configuration including the standard and modified nonstan-9 dard configurations, is still a challenging problem. This paper proposes a simultane-10 ous, fully(More)
1. Abstract The past decade has seen a variety of operating modifications for Simulated Moving Bed (SMB) processes, including Three-Zone, VARI-COL, and PowerFeed. In recent studies, we have shown that these can all be embedded within a superstructure optimization problem with time-variant flow rates. Moreover, the resulting dynamic optimization problem has(More)
A new improvement based on outlet fractionation and feedback has been developed for simulated moving bed (SMB) chromatography. In this contribution, this fractionation and feedback SMB (FF-SMB) concept is extended to the general scenario which integrates a simultaneous fractionation of both outlet streams. A model-based optimization approach, previously(More)
An enrichment step is proposed to simulated moving bed chromatography with fractionation and feedback (FF-SMB), a new variation of SMB, to concentrate recyclates before they are fed back into the unit. Effectiveness of this operation is evaluated by systematic optimization studies. Case studies reveal that enriching recyclates is advantageous to FF-SMB and(More)
SMB represents one of the widely established periodic adsorption processes and its periodic and nonlinear dynamics presents a significant challenge to the formulation and solution of the optimal startup issue. A multistage startup concept allowing to adjust operating conditions stage-wise is proposed. The startup problem is then formulated aiming at driving(More)
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