Thermally Assisted Simulated Moving Bed Systems

Kim, Jeung Kun; Abunasser, Nadia; Wankat, Phillip C.; Stawarz, Andrew C.; Koo, Yoon‐Mo

doi:10.1007/s10450-005-5988-2

Cited by 20 publications

(24 citation statements)

References 5 publications

(7 reference statements)

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“…One is to express both q s and b as a function of temperature, while the other is to express only b as a function of temperature. Between the two, the latter has been the most accepted approach in the area of temperature-gradient separation process development. − It has also been widely adopted in other areas. − Furthermore, the latter approach is more faithful to the fundamental theory of the Langmuir model, which is based on the principle that the saturation capacity ( q s ) must be independent of temperature . Therefore, the latter approach will be used in this study.…”

Section: Theorymentioning

confidence: 99%

“…It was also found from the measured adsorption equilibrium data that the adsorption affinity of each acid to Amberchrom CG300C was largely affected by temperature. This indicates that the design of a temperature-gradient SMB process, which was reported to surpass a classical SMB in separation performance, − is also practicable. Finally, the thermodynamic properties of the system under investigation were estimated, which revealed that the adsorption of each acid onto Amberchrom CG300C was exothermic and belonged to the case of physisorption.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption Equilibria of Succinic Acid and Lactic Acid on Amberchrom CG300C Resin

Nam¹,

Park²,

Lim³

et al. 2011

J. Chem. Eng. Data

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One of the prerequisites to the development of a simulated moving bed (SMB) or a temperature-gradient SMB process for separation of succinic acid and lactic acid is to obtain their adsorption equilibrium data on a properly selected adsorbent. It was first found that an Amberchrom CG300C resin could function well as a qualified adsorbent for the separation processes of interest. On the basis of the selected adsorbent, the single-component adsorption equilibria of succinic acid and lactic acid were measured using a staircase frontal analysis method over the temperature range of (30 to 50) °C and the liquid-phase concentrations up to 10 g·L−1. The resultant adsorption data were correlated with the Langmuir and the bi-Langmuir adsorption models. For these two models, the effect of temperature on the Langmuir and the bi-Langmuir equilibrium constants was examined, which revealed that the adsorption of each acid onto Amberchrom CG300C was exothermic. Such a temperature effect was expressed mathematically, which was then incorporated into each model equation. The resultant temperature-dependent form of the model equation allowed accurate predictions of all the adsorption equilibrium data acquired over the investigated temperature range. The adsorption equilibrium data and the model parameters reported in this study will be of great value in the stage of designing the temperature-gradient SMB process that is packed with the Amberchrom CG300C resin and targeted at separating succinic acid and lactic acid.

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption Equilibria of Succinic Acid and Lactic Acid on Amberchrom CG300C Resin

Nam¹,

Park²,

Lim³

et al. 2011

J. Chem. Eng. Data

View full text Add to dashboard Cite

show abstract

“…These two parameters ( q s and K L ) are called the Langmuir model parameters. In regard to the temperature dependences of the Langmuir model parameters, it is widely accepted in the area of adsorption separation process development that only K L is affected by temperature, while q s is independent of temperature. − …”

Section: Resultsmentioning

confidence: 99%

“…In the previous section, the Langmuir model parameters were determined at three discrete temperatures (Table ). This can sometimes be a barrier to the immediate application of the Langmuir model to the design or simulation of a temperature-gradient chromatographic process, where the process temperature is usually allowed to undergo continuous variation along the axial distance. , In this case, it would be more efficient to utilize the Langmuir model expressed as a continuous function of temperature. Such a temperature-modulated model that can account for the adsorption data in Table is described in this section.…”

Section: Resultsmentioning

confidence: 99%

Separation of Acetic Acid, Formic Acid, Succinic Acid, and Lactic Acid Using Adsorbent Resin

2012

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The single-component adsorption equilibria of acetic acid and formic acid on an Amberchrom-CG300C resin were measured using a staircase frontal analysis method over the temperature range from (30 to 50) °C at liquid-phase concentrations of up to 10 g·L–1. The resultant adsorption data were correlated with the Langmuir model, and the corresponding model parameters were determined. In addition, the effect of temperature on the Langmuir equilibrium constants was investigated, and the results were utilized to determine the thermodynamic parameters for the adsorption of interest. The results of these investigations indicated that the adsorption of each organic acid onto Amberchrom CG300C is exothermic and controlled by physical mechanisms. Furthermore, a temperature-modulated adsorption model for each organic acid was developed by incorporating its thermodynamic parameters into the Langmuir model. The resultant temperature-modulated Langmuir model equation was confirmed to be highly accurate in predicting all of the adsorption equilibrium data acquired over the investigated temperature range. The adsorption equilibrium data and the model parameters reported in this study will be of great value in designing a chromatographic process for separating the organic acid mixture resulting from fermentation based on Actinobacillus bacteria.

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“…Recently, three new operation strategies for SMB have been suggested. One strategy is the direct manipulation of adsorption equilibria by a supercritical fluid,1, 2 a solvent gradient,3, 4 or a temperature gradient 5, 6. The second strategy is to combine a conventional SMB unit with an additional separation step.…”

Section: Introductionmentioning

confidence: 99%

Improved performance of simulated moving bed process using column‐modified feed

2010

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A ''FeedCol'' strategy was developed to improve separation performance in simulated moving bed (SMB) processes. In the FeedCol operation, a short chromatographic column was simply added to the SMB unit and feed was supplied by a pulse input through the column to the SMB process. Because the feed was made in the shape of partially separated chromatographic peaks through the column, the purities in the raffinate and extract products were improved efficiently in the SMB process. All the performance parameters for a binary mixture with low selectivity (a ¼ 1.1) were better for the FeedCol operation than for the conventional SMB operation (2-2-2-2). Because the feed injection through the feed column was synchronized with the SMB process during the switching period, two new operating variables were introduced: injection length and injection time. Their effects on the suggested strategy were evaluated in terms of performance parameters through a detailed simulation study.

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Thermally Assisted Simulated Moving Bed Systems

Cited by 20 publications

References 5 publications

Adsorption Equilibria of Succinic Acid and Lactic Acid on Amberchrom CG300C Resin

Adsorption Equilibria of Succinic Acid and Lactic Acid on Amberchrom CG300C Resin

Separation of Acetic Acid, Formic Acid, Succinic Acid, and Lactic Acid Using Adsorbent Resin

Improved performance of simulated moving bed process using column‐modified feed

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