Experimental assessment of simulated moving bed and varicol processes using a single-column setup

Rodrigues, Rui C. R.; Araújo, João M. M.; Eusébio, Mário; Mota, José P. B.

doi:10.1016/j.chroma.2006.10.044

Cited by 42 publications

(24 citation statements)

References 44 publications

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“…The implementation of the Varicol process can increase productivity up to 30%, compared with the conventional SMB mode of operation, for a given purity requirement, mainly for units with a reduced number of columns (Ludemann-Hombourger et al, 2002;Toumi et al, 2002;Zhang et al, 2002;Pais and Rodrigues, 2003;Subramani et al, 2003;Toumi et al, 2003;Rodrigues et al, 2007). …”

Section: Varicolmentioning

confidence: 99%

Principles of Simulated Moving Bed

Rodrigues¹,

Pereira²,

Minceva³

et al. 2015

Simulated Moving Bed Technology

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Section: Varicolmentioning

confidence: 99%

Principles of Simulated Moving Bed

Rodrigues¹,

Pereira²,

Minceva³

et al. 2015

Simulated Moving Bed Technology

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“…This model, which is described in Appendix B, retains all of the essential properties of the full Parex model—including the bed‐head dead volumes and bed lines—but is computationally much more efficient because its CSS solution can be efficiently computed using a full‐discretization approach. Although this approach has been previously used in simpler SMB models with a small number of columns, it was never applied to the industrial‐scale, 24‐column Parex process.…”

Section: Influence Of the Dead Volumes On The Performance Of The Parementioning

confidence: 99%

Effect of dead volumes on the performance of an industrial‐scale simulated moving‐bed Parex unit for p‐xylene purification

2015

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The cyclic steady state (CSS) of the industrial-scale, seven-zone, simulated moving-bed (SMB) unit for p-xylene (p-x) purification (Parex unit) with three types of dead volumes-bed lines, push-around and pump-around circulation lines, and bed heads-is analyzed. In particular, the effects of the size and level of hydrodynamic dispersion of each dead volume on process performance and on its CSS are studied in detail. The circulation lines change the CSS behavior from t Ã -periodic to Nt Ã -periodic, where t Ã is the switching interval and N512 is the number of columns in each adsorbent chamber. A high level of axial dispersion in the bed lines, characterized by P eclet numbers smaller than 100, affects the p-x purity. Moreover, the bed lines lower the average p-x concentration in the extract, which reduces the p-x recovery. If the small time lags introduced by the circulation lines are neglected, it is possible to develop a detailed process model that considers the operation of the Parex unit over a single switching interval as opposed to a full cycle, and whose CSS solution can be efficiently computed using a full-discretization approach. Finally, it is shown that the volume of the bed heads influences significantly the performance of the Parex unit, and that its impact on the location of the operating point with respect to the boundaries of the separation region can be approximately taken into account using the standard true moving-bed-SMB equivalence rules if they are corrected for the presence of extra interparticle fluid.

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“…R.C.R. Rodrigues et al [18,19] proposed a single column system to investigate the performance of SMB and Varicol processes. It was shown that the experimental period could be significantly reduced, and Varicol process achieved better performances than classical SMB.…”

Section: Introductionmentioning

confidence: 99%