Equilibrium theory for simulated moving bed adsorption processes

Chiang, Anthony S.T.

doi:10.1002/aic.690441111

Cited by 21 publications

(6 citation statements)

References 14 publications

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“…Many authors have applied the powerful equilibrium theory to the design of the SMB (TMB approach/SMB approach), which neglects the mass‐transfer resistances and axial dispersion, and considers the columns to have an infinite efficiency . Although adsorption rate limitations may introduce significant modifications in the form of the chromatographic concentration profiles, they do not change the qualitative picture of the separation region.…”

Section: Modeling Of the Industrial Smb Unitmentioning

confidence: 99%

Modeling and simulation of an industrial‐scale parex process

2015

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The Parex unit for industrial‐scale purification of p‐xylene was studied through detailed simulation and the accuracy of the developed model tested against real industrial data. Starting from a comprehensive analysis of the construction and operation of the industrial unit, a simulation model was developed that incorporates the existing three major types of dead volumes: bed lines, which connect the beds to the rotary valve, circulation lines, which connect adjacent adsorbent chambers, and bed‐head dead volumes, which are located upstream of each bed due to the existence of internals. By gathering operation data and surveys in the pumparound line and in the extract stream, three case studies were defined and compared with simulation results. The model is capable of predicting the performance of the industrial unit. Further simulations were made and compared with plant data to assess the effect of adsorbent capacity loss on the long‐term performance of the unit. © 2015 American Institute of Chemical Engineers AIChE J, 61: 1345–1363, 2015

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Section: Modeling Of the Industrial Smb Unitmentioning

confidence: 99%

Modeling and simulation of an industrial‐scale parex process

2015

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“…Based on this model and assuming stoichiometric Langmuir adsorption isotherm explicit criteria on the TCC operating conditions to achieve complete separation of binary mixtures have been derived . Extensions have included different binary equilibrium isotherms, i.e., nonstoichiometric Langmuir, , bi-Langmuir, and IAS (Ideal Adsorbed Solution Theory) models, as well as some multicomponent separations. − …”

Section: Tcc and Smb Modelingmentioning

confidence: 99%

“…11 Extensions have included different binary equilibrium isotherms, i.e., nonstoichiometric Langmuir, 9,12 bi-Langmuir, 13 and IAS (Ideal Adsorbed Solution Theory) models, 14 as well as some multicomponent separations. [15][16][17] These criteria are given in terms of the flow-rate ratios in the different sections of the unit and depend on the feed concentration and the thermodynamic parameters of the system (see Notation for symbols). These yield a lower limit on the flow-rate ratio in section 1, i.e., m 1 > m 1,cr , and an upper limit on the flow-rate ratio in section 4, i.e., m 4 < m 4,cr .…”

Section: Tcc and Smb Modelingmentioning

confidence: 99%

Temperature Gradient Operation of a Simulated Moving Bed Unit

Migliorini

Wendlinger

Mazzotti

et al. 2001

Ind. Eng. Chem. Res.

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The simulated moving bed (SMB) technology has shown great potential for fine chemical separations, particularly for the resolution of the enantiomers of chiral compounds. Further improvements of separation performance are expected when each section of the unit is optimized independently by applying a gradient of temperature, pressure, or solvent composition along the unit. The aim of this work is to extend the design criteria for nonlinear SMBs to the case where a temperature gradient mode is adopted. It is shown how beneficial this can be in terms of productivity and solvent consumption. Finally, the temperature transient in the columns is studied. It is shown that temperature changes in the column of the unit yield a constraint on the maximum fluid velocity. This is analogous to the constraints due to column efficiency and packing stability requirements. The results show that the temperature gradient operation of an SMB unit is feasible and may have significant advantages over the traditional isothermal mode.

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“…The application of the Equilibrium Theory (DeVault, 1943;Klein et al, 1967;Tondeur and Klein, 1967;Helfferich, 1967;Helfferich and Klein, 1970;Rhee et al, 1970) by Storti et al (1989Storti et al ( , 1993, Mazzotti et al (1997), Chiang (1998) and Migliorini et al (2000) led to the formulation of the "Triangle Theory." This is an important methodology in the SMB design field; it allows one to find a feasible zone where separation is obtained for both linear or non-linear isotherms.…”

Section: Introductionmentioning

confidence: 98%

Simulated moving bed technology: old and new

2006

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The Simulated Moving Bed (SMB) concept has been applied to the separation of different mixtures as a continuous counter current separation process, avoiding several problems related with solid motion. The aim of this work is to present some relevant examples of SMB separations corresponding to the two major ages in the use of the SMB concept, here named "old" and "new" applications. The "old" applications of SMB technology in the petrochemical industry are still important, with large and highly productive units; and the "new" applications of the second "age" of SMB concept are from the fine chemical, pharmaceutical and biochemistry areas, associated with the demand of high purity products during the last 10 years. Different examples are presented for different ages: a UOP Parex R process for the "old", modelled with the equivalent True Moving Bed (TMB) approach; and a chiral resolution for the "new", modelled by the real SMB model. Some of the latest developments are also mentioned: the non conventional techniques as the Varicol R process, PowerFeed, Modicon, M3C or Enriched Extract-SMB (EE-SMB), MultiFeed (MF), Outlet Streams Swing (OSS) or Pseudo-SMB, involving considerable changes in the SMB concept itself. The use of the last optimization/modelling packages P. Sá Gomes . M. Minceva . A. E. Rodrigues ( ) Laboratory of Separation and Reaction Engineering

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Equilibrium theory for simulated moving bed adsorption processes

Cited by 21 publications

References 14 publications

Modeling and simulation of an industrial‐scale parex process

Modeling and simulation of an industrial‐scale parex process

Temperature Gradient Operation of a Simulated Moving Bed Unit

Simulated moving bed technology: old and new

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