A new mass transfer model for cyclic adsorption and desorption

Kim, Yong-Min; Suh, Sung-Sup

doi:10.1007/bf02707133

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…To measure the concentration of the fluid phase, an Anton Paar Density meter was used and data repeatability of 0.5% was obtained with the accuracy of ±0.001 g/cm 3 . All experiments were organized by a 2 K factorial design which allowed fitting of models from a reduced number of experimental points, accomplishing interactions among the variables and the linear terms of each variable.…”

Section: Methodsmentioning

confidence: 99%

“…There have been several researches on adsorption of water from ethanol/ water mixture, and they fall into two types: numerical simulation of dehydration of ethanol and water mixture [1][2][3][4] and experimental works to study the effects of its operating parameters in a single packed bed of 3A zeolite [5][6][7]. The effects of feed rate, feed concentration, adsorption temperature, and adsorption pressure are among the interesting factors that are examined.…”

Section: Introductionmentioning

confidence: 99%

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Production of pure ethanol from azeotropic solution by pressure swing adsorption

Pruksathorn

Vitidsant

2009

Korean J. Chem. Eng.

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There has been a gaining interest in the use of fuel ethanol from fermentation process. A main challenge in producing the ethanol concerned the production cost which was largely contributed by the process of water removal. Distillation could remove water to a certain level but due to ethanol-water azeotrope an extra process was needed before ethanol could be blended with gasoline. Problem statement: Pressure Swing Adsorption (PSA) process was attractive for final separation since it required less energy and lower setup cost. Despite many researches on simulation and experimental works on adsorption of water on 3A zeolite in a fixed bed, none have studied a process with the actual PSA system. Approach: The purpose of this research was to study the PSA process with two adsorbers and effects of several parameters. The research also included analysis of kinetic and thermodynamic data of ethanol-water adsorption on commercial 3A zeolites in a single fixed bed. Two-level factorial design experiment was used in this research works to preliminary screen the influence and interaction among each factor. Results: From the experimental works, it was found that the most suitable condition for water adsorption on 30 g of zeolite was at 90°C initial bed temperature, feed flow rate of 1 mL min −1 and feed concentration of 95% vol ethanol. Langmuir isotherm could best predict the experimental results and the corresponding equation was proposed. In the PSA pilot test, the principal factors, which had an effect on the adsorption rate, recovery, and the enrichment of the product, were feed rate, feed concentration, adsorption pressure and the cycle time. Prediction of the process efficiency in terms of ethanol recovery and enrichment was proposed in the form of regression models. Conclusions/Recommendations: The results of the study in a fixed bed adsorber could help designing a pilot scale PSA unit. The experiments proved to be successful in terms of producing high concentration ethanol with acceptable percentage of ethanol recovery. With further simulation works, the process could be scaled up for an industrial use.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Production of pure ethanol from azeotropic solution by pressure swing adsorption

Pruksathorn

Vitidsant

2009

Korean J. Chem. Eng.

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“…A lot more research was done to develop desorption models and optimize TSA processes. However, the main focus lies on the modeling of sorption processes, and no qualitative discussion of experimental data referring to equilibrium theory occurs. − …”

Section: Introductionmentioning

confidence: 99%

Desorption of Mercaptans and Water from a Silica–Alumina Gel

Chowanietz

Pasel

Luckas

et al. 2017

Ind. Eng. Chem. Res.

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An industrially widely used technology for the removal of condensable components like water and mercaptans from natural gas is cyclic temperature swing adsorption. Optimized design of these coupled adsorption−desorption processes requires detailed knowledge of desorption properties of the used adsorbents. Therefore, the desorption behavior of water, methyl mercaptan, and ethyl mercaptan was investigated on a commercial silica−alumina gel. In dynamic experiments, a preloaded fixed bed was regenerated with hot purge gas (300 °C), and time-dependent concentration and temperature profiles were measured and discussed by means of equilibrium theory. Characteristic plateau temperatures were found between 43 and 63 °C, rising with the adsorption affinity. Experiments with competitive adsorption of water and mercaptans show that process dynamics are mainly controlled by water. The results are evaluated with regard to technical relevance.

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“…Other models for cyclic adsorption have been proposed and discussed by, for example, Buzanowski and Yang (1991), Gadre et al (2005), Hsuen (2000), Kikkinides and Yang (1993), Kim (1996Kim ( , 2009), Kim and Suh (1999), Sheng and Costa (1997), and Yao and Tien (1998).…”

Section: Introductionmentioning

confidence: 98%

A new intraparticle mass transfer rate model for cyclic adsorption and desorption in a slab, cylinder or sphere

Yao

2012

Adsorption

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A new intraparticle mass transfer rate model for cyclic adsorption and desorption in a slab, cylinder or sphere is proposed on the basis of the asymptotic behaviors of the adsorption rate for short and long cycle periods. Through comparison with the exact solution and the linear driving force (LDF) model, the new model is shown to provide a very good approximation for the instantaneous amount adsorbed as well as the adsorption rate for dimensionless halfcycle period τ c = 0.001 ∼ 1 and is much better than the LDF model.

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A new mass transfer model for cyclic adsorption and desorption

Cited by 13 publications

References 12 publications

Production of pure ethanol from azeotropic solution by pressure swing adsorption

Production of pure ethanol from azeotropic solution by pressure swing adsorption

Desorption of Mercaptans and Water from a Silica–Alumina Gel

A new intraparticle mass transfer rate model for cyclic adsorption and desorption in a slab, cylinder or sphere

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