Analysis of the boundary conditions for the simulation of the pressure equalization step in PSA cycles

Delgado, José A.; Rodrigues, Alı́rio E.

doi:10.1016/j.ces.2008.06.016

Cited by 25 publications

(18 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The overall pressure can be lower if the gas transferred is fast adsorbed [111]. The result of the pressure equalization step is a direct improvement in the recovery of the light product [112,113]. The introduction of a pressure equalization step in a 2-column PSA unit results in a significant change of the "continuity" of the process.…”

Section: Modifications To the Skarstrom Cycle: New Cycle Stepsmentioning

confidence: 99%

“…There are different degrees of complexity to define a PSA model, 6 ISRN Chemical Engineering normally comprising several partial differential equations linked by the equation of state and the isotherm model to define the thermodynamic properties of the gas and adsorbed phases, respectively. Although the model can be solved by numerical methods [55,113,[178][179][180][181][182][183], there are several commercial programs that can be already used for that purpose: ASPEN, COMSOL, gPROMS, PROSIM, and so forth [18,[184][185][186][187].…”

Section: Advances In Process Engineeringmentioning

confidence: 99%

See 1 more Smart Citation

Advances in Pressure Swing Adsorption for Gas Separation

Grande

2012

ISRN Chemical Engineering

184

108

View full text Add to dashboard Cite

Pressure swing adsorption (PSA) is a well-established gas separation technique in air separation, gas drying, and hydrogen purification separation. Recently, PSA technology has been applied in other areas like methane purification from natural and biogas and has a tremendous potential to expand its utilization. It is known that the adsorbent material employed in a PSA process is extremely important in defining its properties, but it has also been demonstrated that process engineering can improve the performance of PSA units significantly. This paper aims to provide an overview of the fundamentals of PSA process while focusing specifically on different innovative engineering approaches that contributed to continuous improvement of PSA performance.

show abstract

Section: Modifications To the Skarstrom Cycle: New Cycle Stepsmentioning

confidence: 99%

Section: Advances In Process Engineeringmentioning

confidence: 99%

Advances in Pressure Swing Adsorption for Gas Separation

Grande

2012

ISRN Chemical Engineering

184

108

View full text Add to dashboard Cite

show abstract

“…They found that the following heuristic rule should approximately hold, P eq /P L =(0.5-0.8)P H /P L , so as not to affect the product purity and recovery. Delgado and Rodrigues [11] have analyzed the effect of three types of boundary conditions on the time and spatial profiles of the pressure equalization step of a Skarstrom PSA cycle. The present paper aims at simulating the pressure equalization between two adsorption beds without considering these restrictive assumptions that can impair the accuracy of the simulation results.…”

Section: Introductionmentioning

confidence: 99%

Predicting the final pressure in the equalization step of PSA cycles

Chahbani

Tondeur

2010

Separation and Purification Technology

View full text Add to dashboard Cite

“…Warmuzinski and Tanczyki [7], have also proposed a formula for calculating the equilibrium pressure P eq in the case of linear uncoupled isotherms and no breakthrough of the more strongly adsorbed component from the bed undergoing depressurization. Delgado and Rodrigues [8] have analyzed the effect of three types of boundary conditions on the time and spatial profiles of the pressure equalization step of a Skarstrom PSA cycle. Chahbani and Tondeur [9] have simulated the dynamics of the pressure equalization step and evaluated the equilibrium pressure numerically and analytically.They have shown that in some simple cases only the pressure equalization step can be decomposed into independent pressurization and depressurization steps and that the constant pressure at the open end of the pressurized or depressurized bed should be accurately estimated prior to this decomposition.…”

Section: Introductionmentioning

confidence: 99%

“…Where the total number of moles in the system n is given by the sum of Equations (7) and (8). The subscript eq refers to the end of the equalization step.…”

mentioning

confidence: 99%

Modeling and Simulation of Pressure Equalization Step Between a Packed Bed and an Empty Tank in Pressure Swing Adsorption Cycles

Chahbani¹,

Talmoudi²,

Jaoued³

et al. 2017

TOCENGJ

View full text Add to dashboard Cite

Background:It is of paramount importance to pay a great attention when modeling pressure equalization step of pressure swing adsorption cycles for its notable effect on the accurate prediction of the whole cycle performances. Studies devoted to pressure equalization between an adsorption bed and a tank have been lacking in the literature. Many factors could affect the accuracy of the dynamic simulation of pressure equalization between a bed and an empty tank. Methods:The method used for the equilibrium pressure evaluation has a significant impact on simulation results. The exact equilibrium pressure (P eq ) obtained when connecting an adsorption column and an empty tank could only be obtained by numerical simulation given the complexity of the set of partial differential equations. Results:It has been shown that, with some simplifying assumptions, one can analytically determine Peq with satisfactory precision. The analytical solution proposed permits to assess rapidly the equilibrium pressure and the equilibrium mole fraction of the adsorbable species in the tank (Y eq ) and without the need to resort to a cubersome modeling. Conclusion:Based on the comparisons presented, one can conclude that the agreement between the experimental and numerical results relative to P eq and Y eq is very satisfactory.

show abstract

Analysis of the boundary conditions for the simulation of the pressure equalization step in PSA cycles

Cited by 25 publications

References 16 publications

Advances in Pressure Swing Adsorption for Gas Separation

Advances in Pressure Swing Adsorption for Gas Separation

Predicting the final pressure in the equalization step of PSA cycles

Modeling and Simulation of Pressure Equalization Step Between a Packed Bed and an Empty Tank in Pressure Swing Adsorption Cycles

Contact Info

Product

Resources

About